AIR CONDITIONING—429 CHRYSLER SERVICE MANUAL Section XVII CHRYSLER HEATER-AIR CONDITIONING SYSTEM CONTENTS Page Operating Controls 432 Air Discharge and Distributors 435 Temperature Control 435 Inspection and Testing of Complete Air Conditioning System 436 Compressor Capacity Test. 437 Precautions to Observe in Handling Refrigerant 438 Testing for Leaks with Leak Detector 439 Discharging the System 440 Evacuating and Sweeping System. 440 Moisture in Air Conditioning System 441 Charging the System 443 Testing Thermal Switch 444 Testing for Proper Super Heat 445 Pressure Relation Chart 446 Testing Electrical Switches and Control Circuits 447 Removal and Installation of Air Conditioning Unit 448 Removal and Installation of Expansion Valve. 450 Removal and Installation of Compressor 451 Service Diagnosis 455 DATA AND SPECIFICATIONS COMPRESSOR Location Type ......... Bore Stroke Displacement Type Valve Speed (Depends on axle ratio and tire size) Oil Capacity (MOPAR Refrigerant Oil; 300 Saybolt) Clutch Muffler ....... Airtemp Right Cylinder 2 cyl. 2§f inch l A inch 9.45 inch Reed Type Approx. 1250 r.p.m. at 25 m.p.h. 12 ounces Rotating Coil I n Compressor Discharge Line 6 l CHRYSLER SERVICE MANUAL 430—AIR CONDITIONING CONDENSER Location Front of Radiator RECEIVER STRAINER-DRIER Type Location Cylindrical Steel Container Front of Front Radiator Yoke REFRIGERANT Refrigerant Total Charge. Freon 12 or Genetron 12 3 pounds EVAPORATOR Location Cowl Panel BLOWERS Type Location Capacity Centrifugal I n Heater U n i t 250 to 300 cubic feet of air per minute at high speed Approximately 10 amps Current Draw SPECIAL TOOLS Tool Number C-3354 C-3355. . C-3356 C-3444 C-3358 C-3361 C-3372 C-3128 C-3420 C-3421. C-3363 C-3365 C-3366 C-3362 C-804 C-3478. C-3429 C-744 C-3473 SP-2922 Tool Name T E S T I N G OUTFIT—Consisting of one manifold complete w i t h two valves; one 30 x 300 lbs. compound gauge; and one 600 lbs. pressure gauge. (Use w i t h C-3365 and C-3366 Test Hoses.) GOGGLES—Safety (Pair). T H E R M O M E T E R S E T — T w o i n separate pocket cases. (Calibrated from 0° to 220° F.) . T O R C H — L e a k Detector—Includes extra tank of liquid petroleum fluid. W R E N C H — F l a r e Nut—Open E n d Box Type W and iy " (two per set). W R E N C H — R a t c h e t Special Refrigeration Type—M" sq. Drive w i t h sq. and Y2 Hex. i n Handle. . PUMP—Refrigeration Vacuum (Pump charged w i t h 75 Vis. Ref. O i l ) . P L I E R S — D r i v e Pulley Seal Retainer Snap Ring. A D A P T O R — F r e o n Cylinder Valve to Test Hose. CLIP—Set of two—Attaching Thermometer to Tube. W R E N C H SET—Flare Nut—Open E n d Box Type % " and 1" Openings (two per set). HOSE—Test w i t h End Plugs—4 Feet Long (set of two) (use w i t h C-3354). HOSE—Test w i t h End Plugs—8 Feet Long (use w i t h C-3354). . B E N D E R SET—For M", /fe", W, W, V2 and Tubes. . .TOOL—Tube Flaring. CUTTER—Tube. SCALE—Freon Weighing. TEST LAMP. S E A T P U L L E R and installing tool. COMPRESSOR C A P A C I T Y T E S T V E N T CAP. s 5 AIR CONDITIONING-^31 CHRYSLER SERVICE MANUAL Section XVII CHRYSLER HEATER-AIR CONDITIONING SYSTEM A completely new combined Heater and A i r conditioning unit ( F i g . 1) has been developed for the 1957 Chrysler cars. The new unit is located i n the dash area and provides temperature control for all-weather driving. Temperature control i n the 1957 A i r Conditioner is secured through a reheating pro- OUTSIDE AIR COWL VENT INTAKE HEATING CORE EVAPORATOR COIL O N E - P I E C E MOLDED PLASTIC HOUSING WATER FLOW CONTROL VALVE BLOWER COMPRESSOR LINES FROM E N G I N E BLOCK Fig. 1—Heater-Air Conditioning (Schematic Drawing Passenger Compartment Installation) DEFROSTER OR COOLING OUTLET GRILLES OUTSIDE COWL VENT INTAKE EVAPORATOR COIL cess. For summer operation, the air is dehumidified and cooled as i t passes through the evaporator coil and then reheated by the heater core to a temperature that is selected by the driver. The amount of reheat added to the air as i t passes through the heater core is controlled by metering hot water through the heater core. The flow of hot water is regulated by a modulating valve. A reheat type temperature control gives dehumidification even when minimum cooling is desired. During the heating cycle, outside air is i n troduced into system through a permanently open vent i n the top of cowl section ( F i g . 2 ) . Passing through the open fresh air door, air is drawn through both the cooling and heating coils by the Centrifugal Blower ( F i g . 3 ) . The air, heated by the heating coil, is then forced into the distribution duct for temperature distribution. The cooling cycle is quite similar except that air may be brought from the outside or i t may be recirculated through the recirculating door (Fig. 4 ) . The controls are so arranged that the recirculation feature is only employed when maximum cooling capacity is required. HEATER CORE FRESH AIR DOOR POWER PISTON T4 COWL VENT AIR CONDITIONING \ HEATER SWITCH CONTROL LEVER PLENUM BLOWER V CHAMBER PANEL AND FLOOR DUCT DISTRIBUTION DUCT \ DAMPER CONTROL \ ^ \ q 57x589 COOLING HEATING - WARMER COWL VENT DOOR OPEN BLOWER 57x597 Fig. 2—Heater-Air Conditioning (Schematic Drawing Fig. 3—Blower Motor a n d Vent Door Engine Compartment Installation) (Schematic Drawing) -7 432—AIR CONDITIONING CHRYSLER SERVICE MANUAL COOLING HEATING COOLING HEATING COWL VENT DOOR (CLOSED)^ RECIRCULATING DOOR (OPEN) RECIRCULATING DOOR (OPEN) DAMPER DOOR \ DAMPER 57x596 \ Fig. 4—Recirculating a n d Damper Door 57x591 Fig. 6—Recirculating a n d Fresh Air Door 1. OPERATING CONTROLS The controls f o r the heater-air conditioner are p a r t i a l l y power actuated. The m a i n control lever, operating t h r o u g h a cable, operates the water temperature valve and also the fresh a i r and recirculating door through t w o electric switches, the solenoid valve, and power piston assembly ( F i g . 5 ) . When the solenoid valve is energized, i t permits engine oil pressure to act on the power piston, closing the cowl vent fresh air door and opening the recirculating door. F i g u r e 6 shows fresh a i r and recirculating doors. F i g ure 7 shows schematic diagram hydraulic circuit for operating the power piston. Figure 8 illustrates the dampers used i n cont r o l l i n g the system, and control components that are mounted on the instrument panel. AUXILIARY TUBE OIL T W O WAY DRAIN F O R A I R AND LEAKAGE PAST PISTON SOLENOI VALVE CHECK TO X VALVE A PREVENT LOSS OF OIL rFROM PRESSURE DURING E N G I N E IDLE OIL CIRCUIT CIRCUIT ^ POINT IN ENGINE OIL WHEN WHEN T O LOW P R E S S U R E P O I N T IN E N G I N E OIL SYSTEM SYSTEM ACTUATION ( RECIRCULATING OIL HIGH ^PRESSURE IS R E Q U I R E D DOOR O P E N ) PRESSURE ( R E C I R C U L A T I N G DOOR IS NOT R E Q U I R E D CLOSED ) 57 X 499 Fig. 7—Hydraulic Circuit for Power Piston DAMPER UPPER OR LOWER LEVEL SELECTION POWER PISTON DISTRIBUTION DUCT -HIGH PRESSURE ENGINE OIL Fig. 5—Power Piston a n d Recirculating Door 57x592 Fig. 8—Distributing Duct a n d Control Components CHRYSLER SERVICE MANUAL AIR CONDITIONING—433 The fresh air door and the recirculating door are linked together i n such a manner that when one is closed the other is open. 1. Compressor clutch and water valve heating element w i l l be energized (Figs. 9 and 10). The two air flow control dials are mounted on concentric shafts. The inner "Blower" switch controls the speed of the blower motor. Three speeds are available through the selection of wire taps i n the motor fields. 2. Hot water shut off to heater core. The outer dial marked " A i r " controls the positioning of distribution duct damper, and is used to proportion the air distribution between the instrument panel grilles and the distributor duct slots. The control is lettered " U p " and "Down" w i t h arrows indicating the proper rotation for panel or floor discharge. 4. Maximum cooling w i l l be obtained. The toggle switch w i t h positions marked "Cooling" and "Heating" permits the energizing of the compressr clutch circuit and the resistance coil of the water temperature control valve. This action occurs when the switch is placed in the "Cooling" position. I n the "Heating" position, i t insures that these circuits w i l l not be energized. I t should be noted that the main control lever must be i n some position other than "Off" to permit the closing of the clutch and coil circuits by the toggle switch. The position of the toggle switch also has a bearing on the fresh air door and recirculating door. 2. POSITIONING CONTIOL LEVER a . Moving the main control lever from "Off" to "Cold" (No. 2) position, w i t h the toggle switch i n "Cooling" position, the following sequence of operation w i l l result: DISCHARGE SUCTION NE COMPRESSOR \ L, L , N E TO TEMPERATURE CONTROL SWITCH THERMAL SWITCH 3. Fresh air door closed and recirculating door open resulting i n 80% recirculation air, 20% fresh air. h. Moving the main control lever to the right from the "Cold" or No. 3 position w i t h toggle switch on "Cooling" position, the following operational sequence w i l l occur: 1. T | i ^ | r e s h air door opens and recirculat i n g door closes de-energizing the solenoid valve. 2. Full fresh air cooling obtained. 3. Lever mechanism picks up the cable controlling the water temperature control valve and prepares to open the valve. 4. Hot water shut off to heater core. c. Moving the main control lever from No. 3 position through "Warmer" to No. 4 position opens the water temperature control valve. A t the warmest point i n the "Cooling" position, the water valve w i l l allow the heater core to reheat the cooled air to approximately 75° F. d. Moving the main control lever from "Off" to "Cold" or No. 2 position, ( F i g . 6) w i t h toggle switch i n "Heating" position. 1. De-energizes the solenoid valve, allowing the recirculating door to close and the fresh air door to open. 2. Hot water shut off to heater core. 3. Total fresh air ventilation obtainable, proportioned as desired through i n strument panel grilles and distributor duct slots. e. As the main control lever is moved from the "Cold, No. 2 position to No. 3 position, w i t h the toggle switch i n "Heating" position: RECEIVER-STRAINER-DRIER LIQUID EXPANSION LINE VALVE Fig. 9—Heater Air Conditioning (Schematic of Components) 57x593 1. Lever mechanism picks up the cable controlling the water temperature control valve and prepares to open valve. 2. Hot water shut off to heater core. 3. Total fresh air ventilation is obtainable. CONTROL ACTIONS WITH ENGINE OPERATING FRESH AIR DOOR CLOSED RECIRCULATING DOOR OPEN N O . 1 SWITCH OPEN N O . 2 SWITCH CLOSED COMPRSSOR CLUTCH- -18 BLUE- r THERMAL SWITCH FRESH AIR DOOR O P E N N O . 1 SWITCH CLOSED HEATING RECIRCULATING DOOR C L O S E D N O . 2 SWITCH CLOSED FRESH AIR DOOR O P E N N O . 1 SWITCH CLOSED RECIRCULATING DOOR CLOSEDN O . 2 SWITCH OPEN OFF COLD COOLING sm HEAT WARMER .—• COOL' HE CLUTCH CIRCUIT CLOSED FOOLER CIRCUIT CLOSED FRESH AIR DOOR OPEN RECIRCULATING DOOR CLOSED N O . 1 SWITCH CLOSED N O . 2 SWITCH OPEN CLUTCH CIRCUIT CLOSED FOOLER CIRCUIT CLOSED FRESH AIR DOOR CLOSED RECIRCULATING DOOR OPEN N O . 1 SWITCH CLOSED N O . 2 SWITCH CLOSED ® INDICATES POSITION O F MAIN LEVER ARM CLUTCH CIRCUIT OPEN FOOLER CIRCUIT OPEN FRESH AIR DOOR CLOSED RECIRCULATING DOOR OPEN N O . 1 SWITCH OPEN N O . 2 SWITCH CLOSED CAR C O O L I N G AND HEATER BLOWER M O T O R - " F O O L E R " ELEMENT WATER VALVE RHEOSTAT / l A r V MG ~ (RESISTANCE DECREASES A S WATER VALVE IS OPENED) -18 WHITE- -CZ3—18 WHITE—^) 18 RED SWITCH N O . 1 SWITCH N O . 2 NORMALLY NORMALLY CLOSED OPEN FRESH AIR AND 18 RECIRCULATING RED DOOR SOLENOID (ENERGIZING O F SOLENOID CIRCUIT CLOSES FRESH AIR AND OPENS RECIRCULATING DOOR) COOL NORMALLY OPEN NORMALLY CLOSED 0 18 YELLOW -18 WHITE- HEAT -SELECTOR SWITCH CAR C O O L I N G BLOWER SWITCH 16 DARK G R E E N WHITE STRIPEv \ •—18 RED TEMPERATURE GAUGE IGNITION SWITCH BATTERY HIGH, 16 TAN-WHITE STRIPE 16 BLACK-WHITE STRIPE 16 BROWN-WHITE STRIPE- Fig. 10—Wiring Diagram (Heater-Air Conditioning) 16 BLACK 57x508 CHBYSLE1 SEH¥ICE MANUAL AIR CONDITIONING—435 ALIGNMENT ARROW5 57x594 Fig. 11—Defroster Duct (Schematic Drawing) f. Moving the main control lever from No. 3 position through "Warmer" to No. 4 position opens the water temperature control valve. A t the warmest point i n the "Heating" position, the water valve allows the temperature of the discharge air to reach approximately 130° F. The fresh air door w i l l always open and the recirculating door w i l l always close when car engine is stopped. This puts the system i n a "safe" position for car washing, parking during a rainstorm, etc. 3. A l l DISCHARGE AND DISTRIBUTION Cooled or heated air can be distributed to either upper or lower level of car and i t can be proportioned between the upper and lower level. Fig. 13—Discharge Grille Conditioned air is forced into the car by the blower that is mounted to dash. The air enters a distribution duct and can either be discharged toward the floor of car through slots in the distribution duct or i t can be forced up to two discharge grilles i n the top of instrument panel by means of a damper. I n general, the air w i l l be discharged to the lower level for heating and through upper grilles for defrosting (Figs. 11 and 12) and air conditioning. The discharge grilles i n the top of the i n strument panel ( F i g . 13) can be rotated through a full circle. The grilles, also have hinged deflectors which can be used to direct air up along the roof or directly at the occupants of the front seat. 4. TEMPERATURE CONTROL UPPER DISTRIBUTION DUCTS ACTUATOR RETURN 57x624 WINDSHIELD WIPfcRl MO (OR For summer operation, the air w i l l be dehumidified and cooled as i t passes through the 1LINKI HEATER CORE THERMAL SWITCH •IBi . £... .FRESH AIR DOOR- ; t vS ACTUATOR • ; •1 / WATER FLOW VAlVEi P-^LOWFR^DISTRIBUTION DUCT \\ Fig. 12—Distributor Duct Installed 57x623 EXPANSION VALVE V ^ ^ ^ N ^ ^ Fig. 14—Thermal Switch Installed ^SK**.-^ 436—AIR CONDITIONING CHRYSLER SERVICE MANUAL the secondary tube, i n effect, " t r i c k s " the p r i m a r y capillary tube, ( F i g . 15) located i n the d i s t r i b u t i o n duct, by m a k i n g i t appear w a r m e r than the discharge a i r flowing over i t . The valve w i l l then tend to close, thus reheating the a i r less and s h i f t i n g the temperature to the desired cooler level. 5. INSPECTION AND TESTING O F COMPLETE AIR CONDITIONING SYSTEM a. Preparation for Tests Move car into a well ventilated area and shut off engine. Connect exhaust suction system to t a i l pipe. Inspect condenser and radiator for bugs, etc., and blow out f r o m side opposite entrance w i t h compressed air. Fig. 15—Capillary Tube a n d W a t e r Valve evaporator coil and then reheated by the heater core to a temperature that is selected by the operator. The amount of reheat added to the air as i t passes t h r o u g h the heater core is controlled by metering hot water t h r o u g h the heater core. The flow of hot water is regulated by a modulating valve. A reheat type temperature control gives dehumidification even when m i n i m u m cooling is desired. A thermostatic switch is used to prevent evaporator coil f r o m frosting over. The t h e r m a l switch is installed i n the evaporator to sense the fin temperature of the coil. As temperature of evaporator fins decreases to a point where frost-over m i g h t occur, the t h e r m a l switch ( F i g . 14) w i l l break the compressor clutch circuit, stopping r e f r i g e r a t i o n u n t i l fin temperature increases to a point .above the freezing point of water. The same modulating water valve is used for temperature control for both heating and cooling. The temperature range of the valve is changed by an electric resistance heating coil when cooling is selected by operator. The valve is designed to control the discharge a i r temperature. For the heating cycle this temperature range w i l l be f r o m about 75 to 130° F . The discharge range f o r the A i r Conditioning or summer operation w i l l be approximately 40 to 75° F . This shift i n temperature range is accomplished by the heating of the valve's temperature sensitive secondary capillary tube w i t h resistance heating coil which is wound around the secondary capillary tube. H e a t i n g b. Radiator Check radiator pressure cap. A 14 pound pressure cap and a 180° F . thermostat is used i n all models. Check cooling system and add water or anti-freeze to m a i n t a i n proper level. The cooling system should be protected to a temperature of 20° above zero f o r summer (lower for w i n t e r ) . c. Compressor Belt Check compressor belt tension w i t h a 5 pound pull scale i n center of longest belt span. Compressor belt deflection (each belt) should be Yu\ inch deflection f o r new belt and % inch for used belts. N O T E : A belt having a minimum of *4 hour engine run is considered a used belt. CAUTION Always replace both belts. Never run a new belt with an old belt. Check compressor brackets and bracket attaching bolts for being tight. d. Blower Motor Check f o r loose or poor electrical connections. Check blower switch. Make a blower circulation check by operating the blower on each of its three operating positions: " L o w " , " M e d i u m " and " H i g h " . Check f o r change i n operational speeds, and circulation. e. Drains Check plenum chamber and a i r conditioner housing drains ( F i g . 16) for being clear. CHRYSLER SERVICE MANUAL HEATER BLOWER OPENING \ HEATER CORE TO DASH GASKET \ \ HEATER RECIRCULATING DOOR AIR CONDITIONING—437 zero, and from a zero reading to a vacuum reading "pumping down" all of the refrigerant out of compressor. W i t h compound gauge reading 20 to 25 inches of vacuum, rotate valve stem of discharge service valve (clockwise) until valve is completely front-seated. Open right hand shut-off valve (counter-clockwise) on the gauge manifold set. NOTE: This will allow the small amount of gas trapped between compressor and discharge valve to vent down to zero reading through gauge manifold set center connection hose. Fig. 16—Plenum Chamber and Drain Openings 6. COMPRESSOR CAPACITY TEST To make a compressor capacity test, the system must be isolated from the compressor. I n isolating the compressor from the system, a .020" test cap, Tool SP-2022 must be used to measure the amount of air pressure compressor delivers at given engine speed. To make a compressor capacity test w i t h a test cap, proceed as follows: Start engine, operate at 1200 r.p.m. T u r n blower switch to " H i g h " and temperature control lever to "Cold" position. Open car windows. Allow engine to operate until engine and compressor are up to normal operating temperature. Stop engine and remove the valve stem protective caps from suction and discharge valves. Use ratchet wrench, Tool C-3361 and back-seat both suction and discharge service valves by turning valves (counter-clockwise) all the way. Remove service port caps from suction discharge service valve and attach hoses from gauge set manifold Tool C-3354 ( F i g . 17). A t tach hose from compound gauge on left of gauge assembly to the suction service port. A t tach hose from right gauge to discharge service port. Close both right and left hand shut-off valves (clockwise) on gauge set manifold. Start engine and w i t h compressor operating, adjust engine speed to exactly 500 r.p.m. W i t h ratchet wrench, Tool C-3361 rotate valve stem of suction service valve (clockwise) until valve is completely front seated. Front seating the valves w i l l cause suction pressure to drop to Open left hand shut-off valve on manifold, remove hose from center connection of gauge set. Attach capacity test cap, Tool SP-2922, to center connection of gauge set manifold. Disconnect manifold hose from suction service valve leaving service port open. CAUTION Test cap must be absolutely clean before i n stallation on gauge set connection. Wash with solvent and blow dry. Test cap is meter drilled and wire or similar instrument should never he used to open the vented orifice. I f this is done a doubtful gauge reading may result. Close left hand shut-off valve on manifold while noticing the pressure rise reading on high pressure gauge. Operating engine at exactly 500 r.p.m. the pressure reading on high gauge should read 190 to 210 psi. To make sure reading on gauge is correct, open and close the left hand shut-off valve on gauge set several times. I f pressure readings rise on gauge and correspond to specified specifications, the compressor is functioning up to specifications. Fig. 1 7 - G a u g e Set Installed (Tool C-3354) 438—AIR CONDITIONING N O T E : I f pressure reading is below specifications and tachometer and gauge is reading accurately, stop engine and check the compressor o i l level since low o i l level w i l l cause a lower capacity test reading. A d d o i l to compressor i f necessary and recheck the compressor f o r capacity test readings. I f compressor pressure is below the prescribed specifications w i t h o i l level at 2 inches at dip stick, the compressor valve plate assembly on both banks of compressor should be replaced. A f t e r replacing valve plates on compressor, make a capacity test to again determine compressor pressure capacity. I f compressor w i t h oil level is corrected, and valve plates replaced, does not come up to specified pressure, remove suction service valve f r o m compressor. Inspect suction screen (located i n opening under valve) and see t h a t i t is clean, and gasket properly seated. I f screen is clean, gasket not damaged, and compression test does not come up to specifications, the compressor should be replaced. CHRYSLER SERVICE MANUAL Probe the gauge center connection w i t h t i p of finger. I f p r o b i n g w i t h finger at connection indicates no more gas is flowing, close r i g h t hand valve on manifold gauge set. Stop engine and t u r n both suction and discharge service valves (counter-clockwise) u n t i l they are completely back-seated. A f t e r back-seating each valve, t u r n each valve one t u r n (clockwise) to be i n operating test position. A f t e r completion of test, t u r n both suction and discharge service valves (counter-clockwise) u n t i l they are f u l l y back-seated. Open both hand shut-off valves on manifold to release pressure on manifold gauge hoses. Disconnect and remove hoses f r o m both service valves. Replace valve stem and service p o r t caps and both service valves. A d j u s t f a n belt. Check both cylinder head to compressor attaching bolts f o r tightness. 7. PRECAUTIONS TO OBSERVE I N HANDLING REFRIGERANT WARNING N O T E : W h e n replacing compressor, an adjustment must be made to compensate for the o i l remaining i n system. Check and correct o i l level i n compressor to 2 inches (dipstick measu r e m e n t ) . Start engine and r u n f o r approximately 15 minutes and check o i l level again. Add or subtract to maintain specified l i m i t . Remove compressor test vent cap f r o m manifold and w r a p cap i n clean cloth to protect orifice f r o m d i r t and g r i t . Open r i g h t hand shut-off valve on manifold gauge set. Close left hand shut-off valve. Connect suction hose to service p o r t of suction service port. W i t h engine r u n n i n g at 500 r.p.m. and compressor engaged, "pump d o w n " the compressor by bleeding the a i r out of compressor t h r o u g h manifold gauge center connection. When 25 to 28 reading is indicated on vacuum gauge, t u r n suction service valve a fraction of a t u r n (counter-clockwise) f o r a few seconds and then f r o n t seat the valve. This w i l l allow small amount of gas accumulated i n suction line to flow into compressor and crankcase, m i x i n g w i t h and to be absorbed by the o i l . N O T E : This operation w i l l also cause the gas to flow t h r o u g h the compressor's cylinder and out t h r o u g h the manifold gauge center connection. Safety Goggles, C-3355, should be w o r n protect the eyes. to When properly used, r e f r i g e r a n t is harmless. A few simple precautions, however, should be observed to guard against injuries or sickness t h a t m i g h t occur when r e f r i g e r a n t is improperly handled. a. Precaution Do not expose eyes to liquid. Do not r u b eyes i f splash of r e f r i g e r a n t hits them. A p p l y cold water immediately to area of eye to gradually raise the temperature above freezing point. The use of antiseptic o i l is helpful since o i l forms a protective film over eye ball u n t i l medical aid can be obtained. b. Precaution Do not discharge r e f r i g e r a n t i n area where an open flame is present. The r e f r i g e r a n t n o r m a l l y is non-poisonous. A concentration of gas i n a live flame, however, w i l l produce a poisonous gas. Splashing r e f r i g e r a n t on b r i g h t metal or chrome should also be avoided because gas w i l l t a r n i s h b r i g h t metal, c. Precaution Do not leave charging tanks uncapped. A l w a y s CHRYSLER SERVICE MANUAL replace cap after using charging tanks. A charging tank is shipped equipped w i t h a heavy, protective cap which is used to protect valve and safety plug from damage. To avoid moisture getting into system, charging tanks should not be opened to the atmosphere. CAUTION Use care to avoid moisture entering system. I t is imperative when sweeping or charging the system that the refrigerant be passed through a Drier and Dry-Eye Assembly before the refrigerant enters the A i r Conditioning System. See Figure 18 for methods of attaching "DryEye ' and " D r i e r " to tank assembly. 9 8. INSTALLING GAUGE SET MANIFOLD Remove valve stem protective caps from compressor discharge and suction service valves. Using Tool C-3361, make sure both valves are completely back-seated (counter-clockwise). The normal operating position is when valve is rotated i n a (counter-clockwise) direction. This position also isolates service valve ports from system pressure. Remove protective caps from both discharge AIR CONDITIONING—439 and suction service port caps. Install four-foot test hose from 600 pound gauge fitting on Tool C-3354 to discharge service valve port fitting. Install the other four-foot test hose from 300 pound compound gauge fitting on Tool C-3354 to suction service valve port fitting. Turn both valve handles of gauge set, Tool C-3354 (clockwise) as far as they w i l l go. This w i l l completely seat valves and isolate gauge set manifold center outlet from test hoses. To admit pressure gauges, rotate valve stems of both suction and discharge service valves one turn, (clock-wise). 8. TESTING FOR LEAKS WITH DETECTOR When system is found to be low i n refrigerant, or following repairs on system that necessitated opening of connection, i t is necessary to test for leaks and tighten connections, or to make repairs as required before system is charged and put i n operation. I f system has been discharged for making repairs or to eliminate moisture, system must be evacuated before partially charging to test for a leak. Partially charge system w i t h refrigerant, as outlined i n Paragraph 10, and proceed as follows : (This is necessary only where supply i n system is very low, or when system has been evacuated). The Tool C-3444 (Test Torch) uses petroleum gas and does not require generating to light. Just t u r n valve on, light i t , and adjust to small flame. Move leak detector sniffer tube over all connections. When leak is found, flame in burner w i l l t u r n bright green. Move detector tube around connection to determine magnitude of leak. I f larger leak is found, color of flame w i l l t u r n from bright green to bright purple, NOTE; I f leak is found at flared connection, try tightening connection, using two wrenches. I f leak cannot be eliminated by tightening, system must be discharged, connection or flare reseated or replaced, system evacuated and again partially charged, and re-tested. I f no leaks are found, add to partial charge until system contains three pounds. 10. CHECKING REFRIGERANT BY SIGHT GLASS METHOD Fig. 18—Refrigerant Tank, Detecting Eye, Drier Cartridge (Schematic View) I n some cases, i t may be necessary to add refrigerant to system to provide cooling without weighing, as is normally required. 440—AIR CONDITIONING C H E Y S L E f l SEH¥ICE -MANUAL Follow p r e l i m i n a r y steps, " I n s t a l l i n g Gauge Set M a n i f o l d " , Paragraph 8, and C h a r g i n g System 16, but eliminate those steps i n v o l v i n g scale. S t a r t engine and operate at 1200 r.p.m. T u r n blower control switch to " H i g h " position and temperature switch to "Cold". Rotate both suction and discharge service valves one t u r n (clockwise). Where discharge gauge hand fluctuates when engine is r u n n i n g , close discharge valve slowly (counter-clockwise) u n t i l gauge hand steadies. Charge t h r o u g h drier. Refer to F i g u r e 17 and install d r i e r as i n dicated. Open tank valve one t u r n . Open suction valve on gauge manifold slightly (counter-clockwise). Control r e f r i g e r a n t entering system w i t h this valve. Do not allow suction pressure to exceed 60 psi. Carefully watch sight glass, ( F i g . 1 9 ) . Close gauge manifold suction valve (clockwise) the moment sight glass is clear of bubbles. Stopp i n g flow of refrigerant into system as soon as sight glass is clear (free of bubbles) is i m portant. Too much refrigerant i n system can cause damage. Operate system f o r five minutes and again observe sight glass f o r presence of bubbles. I f there is still evidence of bubbles, continue to carefully charge u n t i l sight glass is clear, and repeat five minute r u n . Where no bubbles are present after five minutes of operation, charge system w i t h an additional charge of refrigerant f o r 10 seconds. Close tank valve and loosen hose connection at tank to gradually release gas f r o m hose. Disconnect hose after gas has escaped. Backseat suction and discharge service valves (counter-clockwise). Remove gauge manifold and install service valve stem and service p o r t protective caps. 11. DISCHARGING THE SYSTEM Install gauge set manifold Tool C-3354. U s i n g Tool C-3361, be sure both discharge and suction service valves are fully backseated (counterclockwise). Connect eight-foot test hose to gauge set manifold center fitting. Insert free end of eight-foot hose into exhaust suction system and t u r n exhaust blower on. N O T E : Expelling the gas into the exhaust system is a recommended safety precaution. Y Fig. SIGHT CJIA'JS 19—Sight G l a s s Installed Open discharge and suction service valves one t u r n . Crack manifold gauge set discharge hand valve a fraction of a t u r n (counter-clockwise) to allow gas to escape. Opening manifold discharge hand valve too much i n order to more quickly discharge system w i l l d r a w compressor lubricant off w i t h the gas. As pressure on manifold discharge gauge drops near zero, open manifold suction hand valve. N O T E : If brazing or some similar repair is to be made on system, leave system open to atmospheric pressure. After service work has been completed, system must be evacuated, partially charged, and leak tested before final charge. 12. EVACUATING AND SWEEPING SYSTEM Whenever system has been open to atmosphere, i t is absolutely essential t h a t system be evacuated and swept w i t h r e f r i g e r a n t to remove all air and moisture. Connect gauge set manifold, Tool C-3354, to compressor and condenser service valves. Discharge system ( i f not previously discharged), as outlined i n Paragraph 11. CAUTION Be sure the pressure has dropped to zero before attaching hose to vacuum pump. Connect eight-foot test hose to center fitting of gauge set manifold and to connection on vacuum pump (Tool C-3372). Open both discharge and suction service valves about one t u r n , r o t a t i n g both valve stems (clockwise). CHRYSLER SERVICE MANUAL Open both gauge set manifold hand valves t u r n (counter-clockwise). Start vacuum pump and observe compound gauge. Operate pump until gauge registers 26 to 28 inches of vacuum. Continue evacuating at 26 to 28 inches for five minutes. Failure to obtain 26 to 28 inches of vacuum would indicate a leak i n system. Close both gauge set manifold hand valves (clockwise). Turn off vacuum pump and remove long test hose from pump. Charge system w i t h refrigerant gas, as outlined i n Paragraph 16. Start engine and adjust speed to 1200 r.p.m. T u r n blower control to " H i g h " and temperature control to "Cold". Operate in this manner for five minutes and test for leaks. Discharge system to sweep out any remaining moisture, and again evacuate system at 26 to 28 inches of vacuum for 10 minutes. Recharge system w i t h three pounds of refrigerant. 13. MOISTURE IN AIR CONDITIONING SYSTEM Moisture i n automotive air conditioning systems is directly or indirectly the real cause of many failures i n air conditioning systems. Basically, moisture can be classified as visible and invisible. Visible moisture, such as rain, clouds, steam, etc., can be seen. Invisible moisture is water vapor which cannot be seen w i t h the eye. This water vapor is everywhere—it is in all solids, liquids and gases. I t is i n the air, and the varying amount is expressed i n terms of relative humidity. Withdrawal of refrigerant from a system that is experiencing freeze-ups at the expansion valve, does not ordinarily reveal visible liquid water i n refrigerant, yet i t is there i n quantities sufficiently to stop refrigeration. Moisture may enter the air conditioning system i n following manner: a. System left open during repair. b. Condensation i n tubing, leaky seal caps, wet driers, unsealed charging hose or manifolds. c. Use of wet oil or refrigerant from i m proper field handling. d. Charging system without drier. The measurement of moisture content i n a refrigerant is expressed i n "Parts Per M i l lion" ( P P M ) . This can be illustrated by saying that one drop of water, i n one million drops of water is one part per million. I t can also be AIR CONDITIONING—441 further illustrated by stating that one drop of water raises the moisture content of 25 pounds of "Refrigerant 12" about 5 ( P P M ) , or 1 pound of "R-12" about 125 ( P P M ) . I n order to be certain the moisture content of a "Refrigerant 12" A i r Conditioning is kept out of the freeze-up range, acid producing and corrosion range, the moisture content should not exceed 10 ( P P M ) . The progressive result of moisture i n excess of 10 (PPM) in "Refrigerant 12" is as follows: Refrigerant 12 plus moisture equals freezeups at expansion valve. Refrigerant 12 plus moisture equals acid (Hydrochloric & Hydrofluoric). Acid plus metals and refrigerant oil equals corrosive sludge. Corrosive sludge plus expansion valves equals sticky or stuck valves. Corrosive sludge plus screens and strainers equal plugged screens and strainers. Corrosive sludge plus compressor reed valves equals corroded leaky valves. Refrigerants such as Refrigerant 12 are known as auto-driers. I n a closed container, moisture tends to leave the liquid and concentrate i n the vapor. A full tank of "Refrigerant 12" when received from manufacturer, is as "dry" of moisture as the manufacturer can produce i t . Yet i t w i l l still contain from 6 to 10 (PPM) moisture i n the liquid phase. A t room temperature, "Refrigerant 12" i n the vapor phase (refrigerant gas above the liquid in a tank) can hold as much as seven times amount of moisture as i t does i n liquid phase. This means starting w i t h a frigerant 12" containing 6 to ture i n the liquid phase, the liquid can contain 42 to 70 full tank of "Re10 (PPM) moisvapor above the (PPM). As this vapor leaves the tank and is charged into the A i r Conditioning System, the moisture enters the system w i t h the vapor. As more and more refrigerant vapor leaves the tank, more and more liquid refrigerant boils into a vapor and the vapor can extract a 7 to 1 ratio of moisture from the liquid remaining i n the tank. By the time the full tank of "Refrigerant 12" is down to about half full, the remaining half tank of refrigerant liquid and vapor w i l l be very dry, as all of the moisture originally con- 442—AIR CONDITIONING CHRYSLER SERVICE MANUAL tained i n the f u l l tank of liquid has been extracted by vapor and charged into the A i r Conditioning System. CAUTION Always opened anyone of the water. insist o n delivery o f refrigerant i n untanks. Do not accept tanks refilled by other than the manufacturer, because possibility of the tank containing free For the above reasons i t becomes imperative when charging a system, to pass the r e f r i g e r ant vapor t h r o u g h an efficient d r i e r before i t enters the system. I f this precaution is not taken, as much moisture may be induced back into the system as was removed d u r i n g evacuation and sweeping. See F i g u r e 18 f o r method of attaching " D r i e r " and " D r y - E y e " to t a n k assembly. Refer to " C h a r g i n g The System, Paragraph 16, for use of " D r i e r " and ' D r y - E y e " equipment to eliminate moisture f r o m system. N O T E : D r i e r cartridges are available i n 8, 12, 20 and 30 cubic inches. A 12 cubic i n c h cartridge is recommended f o r use w i t h refrigerant tank. O n receival, make sure cartridge is sealed w i t h white plastic seal cap. This cap is used to seal moisture f r o m d r i e r cartridge. Used drier cartridges can be re-activated when saturated w i t h moisture provided r e f r i g erant containing oil has not flowed t h r o u g h the drier, by unsealing the cartridge and placi n g i t i n a heated oven f o r a given number of hours. F o r example, i f the cartridge is placed i n a 300 degree oven, i t should remain there f o r 2 hours, 1 % hours i n a 400 degree oven, or 1 hour i n a 500 degree oven, etc. A f t e r heati n g , allow cartridge to cool, reseal w i t h plastic cap and gasket, store i n a d r y area ( a t room temperature). To charge system refer to Paragraph 16. 14. CHECKING SYSTEM FOR MOISTURE W i t h t u b i n g coil, sight glass, moisture detecti n g eye and cap made up i n t o an assembly, as shown i n F i g u r e 20, remove valve stem caps f r o m suction and discharge service valves, back-seat and f u l l y open (counter-clockwise) both valves. Remove caps f r o m valve service ports and attach t u b i n g and flare fitting assembly to the valve service ports, as shown i n F i g u r e 20. S U C T I O N S E R V I C E VALVE ON C O M P R E S S O R DISCHARGE S E R V I C E VALVE AT CONDENSER r ^o w - "- M O I S T U R E V / W ~ Yf DETECTING E Y E CAPPED WITHOUT DRIER CARTRIDGE - SIGHT GLASS -CONTAINER WITH COLD WATER 5 7 X 501 Fig. 20—Moisture Detecting (Schematic Drawing) Eye F i l l the container w i t h cold water t o allow for submersion of coil i n water, as shown i n F i g u r e 20. T u r n valve stem of discharge service valve t w o t u r n s (clockwise). Purge a i r f r o m t u b i n g by slowly loosening up the t u b i n g n u t at suction service valve. A f t e r a l l the a i r has been bled f r o m t u b i n g , retighten nut. Test all connections f o r leaks. S t a r t engine and adj u s t engine speed to 1200 r.p.m. Open car w i n dows and move the operating lever to " C o l d " position, and blower switch to " H i g h " . Slowly turn, the valve stem o f the suction service valve (clockwise) t w o f u l l turns, and check sight glass ( F i g . 1 9 ) , f o r flow of ref r i g e r a n t liquid t h r o u g h glass. A f t e r approximately 15 to 20 minutes of engine operation w i t h liquid flowing t h r o u g h the moisture detecting eye and i f the dot o f eye shows p i n k , excessive moisture is present i n system. I f system is " d r y " or contains a m i n i m u m of moisture, the dot o f eye w i l l slowly change to light blue i n d i c a t i n g the system contains 10 to 20 ( P P M ) of moisture. W h e n d r y eye shows a dark blue the same color as corresponds to the dot on eye, i t is indicative t h a t system contains less t h a n 10 ( P P M ) of moisture and is now ready f o r safe, satisfactory operation. N O T E : I f moisture detecting eye shows p i n k , excessive moisture is present. L i g h t blue w i l l indicate the system is border line, and moisture content should be lowered. AIR CONDITIONING—443 CHRYSLER SERVICE MANUAL To remove the moisture detecting eye and tubing assembly, proceed as follows: W i t h air conditioning system operating, back-seat first the discharge service valve, and then suction service valve (counter-clockwise) and stop engine. Remove tubing coil, sight glass, moisture detecting eye and cap assembly from suction and discharge service valves. V SUCTION S E R V I C E VALVE ON COMPRESSOR NOTE: Install protective flare plugs in end of tubing fitting to keep moisture and other foreign matter from entering tubing. 15. COBBECTING A WET AIR CONDITIONING SYSTEM (WITHOUT DISCHARGING SYSTEM) W i t h tubing and 30 cubic inch drier cartridge and detecting eye made up into an assembly, as shown i n Figure 20, proceed as follows: Remove valve stem caps from suction and discharge service valves and fully back-seat (counter-clockwise) both valves. Remove caps from valve service ports. Remove flare plugs from tubing and drier cartridge assembly and attach flare nuts of tubing to service valves, as shown i n Figure 20. NOTE: Elevate drier and cartridge assembly above compressor height to facilitate absorption. T u r n valve stem of discharge service valve two turns clockwise, and slowly loosen tubing nut at suction service port. Purge air from tubing and drier. Retighten tubing nut after purging air. Test all connections for leaks and correct i f needed. T u r n valve stem of suction service valve two turns (clockwise). MOISTURE DETECTING EYE WITH D R I E R CARTRIDGE Y - DISCHARGE AT SERVICE VALVE CONDENSER Fig. 21—Moisture Detecting Eye and Drier Cartridge Installation (Schematic Drawing) i f the drier cartridge is allowed to remain i n system long enough, i t w i l l also partially reactivate or dry-out the system's saturated drier. To remove the drier cartridge, dry eye and tubing from compressor proceed as follows: Back-seat discharge and suction service valve stems (counter-clockwise). Remove tubing, and drier cartridge assembly from suction and discharge service valves. Replace service port caps. Install flare plugs i n tubing ends to seal out moisture. Tighten all connections securely, and check compressor belts for correct tension. 16. CHARGING THE SYSTEM (Using Moisture Detecting Eye With Drier Cartridge) Refer to Figures 21 and 22 and proceed as follows: Assemble moisture detecting eye and N O T E : W i t h the vehicle located in an area where the air conditioning system can maintain room temperature, allow vehicle to set for approximately 24 hours, or for sufficient time to allow the drier to absorb sufficient moisture. When detecting eye has turned a deep blue, matching the comparison color dot on the dry eye unit, the system is now sufficiently dry to permit satisfactory air conditioning operation. The chemical action, involving a change from a moisture-laden refrigerant to non-moisture laden refrigerant, is as follows: The drier absorbs moisture from the refrigerant vapor. The vapor i n t u r n absorbs moisture from the liquid refrigerant I n this conversion process, Fig. 22—Charging the System CHRYSLER SERVICE MANUAL 444—AIR CONDITIONING drier cartridge to refrigerant tank. Make sure the a r r o w located on " D r y - E y e " unit, points i n direction of flow f r o m tank. Close r e f r i g e r a n t shut-off valve and open refrigerant t a n k valve. Purge a i r f r o m drier by opening refrigerant tank shut-off valve f o r a few seconds. I n s t a l l 14 inch cap on outer end of valve and t i g h t e n cap securely. N O T E : Test all connections with a leak detector torch to make sure all connections are tight. Open refrigerant tank valve and allow moisture detecting eye and tank assembly to be at rest, p e r m i t t i n g the drier to absorb any excessive moisture t h a t may be present i n ref r i g e r a n t liquid. N O T E : Always allow sufficient time for moisture detecting eye to change to a deep blue before attempting to charge or add refrigerant to system. When D r i e r and D r y - E y e Cartridge assembly is coupled to a refrigerant tank f o r the absorbsion of moisture, the w i n d o w of the moisture detecting eye w i l l show a color dot i n dication, such as pink, i f the refrigerant vapor i n the charging t a n k is above 30 ( P P M ) of moisture. A s the D r i e r Cartridge absorbs the excessive moisture content of the refrigerant, the moisture detecting eye w i l l gradually change to a light blue, indicating a lower moisture content, to to 20 ( P P M ) . The eye w i l l change to a deeper blue as the vapor content is reduced. Refrigerant w i t h a 10 ( P P M ) moisture content can be considered safe to use i n the air conditioning system. Set t a n k u p r i g h t i n pail of w a r m water. The temperature of w a r m water must not exceed 125 degrees F . Set pail and t a n k on scale (Tool C-3429) and weigh assembly. Make note of combined weight. WARNING It is absolutely essential that an accurate scale, such as Tool C-3429, be used. Bath scales are not accurate below 100 lbs. Open suction valve on gauge manifold slightly (counter-clockwise). Control r e f r i g e r a n t ent e r i n g system w i t h this valve. Do N O T allow suction pressure to exceed 60 psi. Be sure both discharge and suction pressure service valves are open about one t u r n (clockwise). Carefully watch scale and shut tank valve off when system has absorbed three pounds. I f p a r t i a l charge is desired f o r testing leaks, charge system w i t h r e f r i g e r a n t gas charge u n t i l 100 pounds pressure is reached on discharge pressure gauge. Close suction, valve on gauge manifold (clockwise) . To disconnect tank, loosen eight-foot test hose, allow r e f r i g e r a n t i n hose to escape slowly, and remove hose f r o m tank. 17. TESTING THERMAL SWITCH N O T E : The thermal switch is adjustable. When adjusting the switch, use eccentric slot located on side to adjust in a clockwise direction for "Cold" or (counter-clockwise) direction for "Warm". When midway between "Cold" and 'Warm", the temperature setting will be "Normal", which is the standard factory setting. Connect eight-foot test hose to the center f i t t i n g of gauge manifold and to connection of refrigerant tank ( F i g . 2 1 ) . Be sure both gauge manifold valves are fully closed (clockwise). Open both discharge and suction service valves one t u r n (clockwise), i f not previously done. I f discharge gauge hand fluctuates when engine is r u n n i n g , close discharge valve slowly (counter-clockwise) u n t i l gauge hand steadies. Use "Charge through D r i e r " . Refer to F i g u r e 21 and install drier, as indicated. Open valve tank one t u r n and loosen eightfoot test hose at gauge manifold. Leave connection loose f o r about a second to purge a i r f r o m hose. Start engine and operate at 1200 r.p.m., w i t h blower control set to " H i g h " and temperature control set at "Cold". Fig. 23—Checking Thermal Switch AIR CONDITIONING—445 CH1YSLEB SE1V1CE MANUAL Check air conditioning system for being fully charged. Refer to "Checking Refrigerant by Sight Glass Method". Paragraph 10. Remove thermometer hole plug from lower left side of evaporator heater housing. To i n sure a good thermal contact w i t h suction line well, apply coating of about % of an inch of non-hardening graphite-aluminum compound to bulb of thermometer. r.p.m. Place toggle control switch on "Cooling", and move the air conditioning control lever to "Cold". When the controls are located i n these positions, th^EesfTight should light. T u r n the blower switch to "Low". Close all windows and allow thermal switch to cycle a few times, i n dicated by test light going on and off. 6 Insert thermometer bulb through hole i n evaporator housing into well of suction line (Fig. 23). W i t h cloth, sponge rubber, or other material, tightly seal the hole opening between thermometer and heater housing. Attach one lead of a test light, Tool C-744, to the compression circuit and the other lead to ground. Position test light where its function can be observed readily when reading thermometer. Start engine and adjust engine speed to 1200 NORMAL NOTE: Check heater water valve for being cold (no hot water should be flowing through heater core). Observe test light and thermometer. Cycle the thermal switch a few times. Test light should go out when thermal switch contacts open, and be " O N " when switch closes. The following specifications w i l l indicate the opening and closing degrees of the thermal switch. WARM COLD Open Close Open Close Open Close 34°+2° 37°+2° 30°+2° 34°+2° 42°+2° 45°+2° 18. TESTING FOR PROPER SUPER HEAT To test evaporator expansion valve for super heat, make sure the air conditioning system is fully charged w i t h "Refrigerant 12", and is dry. Use a moisture detecting eye to check system for being dry. Make a compressor capacity check and check all the other components for proper working condition. Install thermometer i n evaporator, as outlined i n "Testing Thermal Switch Test", Paragraph 17. Start engine and adjust engine speed to 1200 r.p.m. T u r n toggle switch to cooling position. Place control lever i n "Cold" position. This w i l l close fresh air door and open recirculation door, allowing sufficient heat from engine to enter fresh air door slots to load the evaporator. NOTE: To assure sufficient heat from engine compartment entering the fresh air door slots, place a small mat or cardboard over the opening between the hood and the body. This will direct the hot air into the cowl vent. T u r n blower switch to " H i g h " . Open car windows. Feel the heater water valve to make sure no hot water is flowing through the heater core. After operating engine for 10 minutes, allow system to normalize. Take reading of suction gauge pressure, and check evaporator thermometer temperature. NOTE: The method used to determine whether the proper amount of refrigerant is metered into the evaporator coils is to determine the number of degrees of super heat the vapor has absorbed in the coils. The specifications are 8 to 15 degrees super heat. It is calculated for all models. See Example Chart for Determining super heat. Observe suction pressure at gauge and obtain the nearest temperature corresponding to this pressure from Temperature-Pressure Relation Chart. From the observed temperature reading on thermometer i n evaporator, subtract 5 degrees to compensate for thermometer connection error and suction line pressure drop. The temperature difference between the suction pressure temperature relation and the corrected evaporator temperature should not be less than 8 degrees nor more than 15 degrees super heat. 446—AIR CONDITIONING CHRYSLER SERVICE MANUAL E X A M P L E O F C H A R T F O R DETERMINING SUPER H E A T B A Suction Pressure at Gauge lbs. lbs. lbs. lbs. N O T E ; Subtracting 41° 47° 53° 58° 26° 32° 38° 43° 4 6 B " from 6 6 D E Corrected Evaporator Observed Thermometer Thermometer Temperature, Temperature 5 Degrees at Evaporator Subtracted Temperature Relation of Suction Pressure Observed 25 30 35 40 C 36° 42° 48° 53° Super Heat 10° 10° 10° 10° D " w i l l equal super heat at " E " . TEMPERATURE AND PRESSURE R E L A T I O N CHART FOR REFRIGERANT (FREON 1 2 OR G E N E T R O N 12) Temp. Press, of F. Refrig. Temp. F. 0 2 4 6 8 10 12 14 16 18 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 9.1 10.1 11.2 12.3 13.4 14.6 15.8 17.1 18.3 19.7 21.0 21.7 22.4 23.1 23.8 24.6 25.3 26.1 26.8 27.6 28.4 29.2 30.0 30.9 31.7 32.5 33.4 34.3 35.1 36.0 36.9 37.9 38.8 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 Press, of Refrig. 39.7 40.7 41.7 42.6 43.6 44.6 45.6 46.6 47.8 48.7 49.8 50.9 52.0 53.1 55.4 56.6 57.1 57.7 58.9 60.0 61.3 62.5 63.7 64.9 66.2 67.5 68.8 70.1 71.4 72.8 74.2 75.5 76.9 Temp. F. Press, of Refrig. Temp. F. 76 77 78 79 80 81 82 83 84 85 , 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 78.3 79.2 81.1 82.5 84.0 85.5 87.0 88.5 90.1 91.7 93.2 94.8 96.4 98.0 99.6 101.3 103.0 104.6 106.3 108.1 109.8 111.5 113.3 115.1 116.9 118.8 120.6 122.4 124.3 126.2 128.1 130.0 132.1 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 Press, of Refrig. 135.1 136.0 138.0 140.1 142.1 144.2 146.3 148.4 151.2 152.7 154.9 157.1 159.3 161.5 163.8 166.1 168.4 170.7 173.1 175.4 177.8 182.2 182.6 185.1 187.6 190.1 192.6 195.2 197.8 200.0 209.2 205.5 CHRYSLER SERVICE MANUAL AIR CONDITIONING-447 switch to "Heat" position and move control lever to "Off" position (test lamp should light) —recirculation door open, fresh air door closed. Move control lever to "Cold" position (test lamp should now be out)—recirculation door closed, fresh air door open. Move control leve to "Warmer" position (test lamp should be out)—recirculation door closed, fresh air door open. Move control lever back to "Off" position. Re-locate test light, attaching one lead to water valve element circuit and the other lead to ground. W i t h toggle switch i n "Cold" position and control lever i n "Off" position (test lamp should be off). Move control lever to "Cold" position (test lamp light d i m l y ) . Move control lever to "Warmer" position (test lamp should increase from dim to bright as resistance is decreased i n rheostat. Feel the water valve element. Valve should go from warm to hot as control lever is moved to the "Warmer" position. Check the three blower motor connections for being tight i n connector. Tighten i f necessary. v 20. PRECAUTIONS TO OBSERVE IN HANDLING TUBING a. Cleanliness During Installation A piece of tubing that has been cut, flared and prepared for installation should be clean and dry. b. Cutting and Flaring Fig. 24—Testing Control Circuits 19. TESTING ELECTRICAL SWITCHES AND CONTROL CIRCUITS Refer to Figure 24 and proceed as follows: W i t h test light, Tool C-744, located on windshield, attach one end of lead to solenoid valve terminal, and the other to ground. Start engine and adjust engine speed to 1200 r.p.m. T u r n toggle switch to "Cool" position. Move air conditioning control lever to "Off" position. W i t h lever located i n this position test lamp should light (recirculation door open, fresh air door closed). W i t h control lever to "Cold", position test lamp should light (recirculation door open, fresh air door closed). Then w i t h control lever to "Warmer" position test lamp should not light (recirculation door closed, fresh air door open). T u r n toggle Use Tool C-3478 to cut, eliminate burrs, and ream tubing. The tube should be double-flared w i t h tool. Always inspect flared joint before installation to determine i f there are any cracks or blemishes on flare that would cause a possible leak. NOTE: Copper washers must be used where joint is steel-to-steel, steel-to-brass or brass-to brass. Copper to steel or brass requires no washer. Use refrigerant oil on flared surface connections when installing or repairing leaky tube connections to improve sealing and reduce torque required. Never use any sort of sealing compound between tube flare and male surface. c. Securing the Tubing Copper tubing must be attached to car structure. A flexible connector (vibration elimina- CHHYSLE1 SE1VICE MANUAL 448—AIR CONDITIONING t o r ) has been placed on the condenser side of compressor to guard against breakage at t h a t point. d. Brazing the Joints pressor j u s t enough to allow gas pressure ( i f any) i n crankcase to escape. W h e n pressure has been released, remove filler plug and use a clean d r y plunger type dipstick ( i / inch round or s i m i l a r rod) to measure oil level. 8 Discharge system before using a torch to braze leaking joints. A v o i d excessive heat when usi n g an acetylene flame to solder or braze a j o i n t . The usual precautions should be followed before r e p a i r i n g a sweat-type j o i n t , such as cleaning thoroughly, applying sufficient flux, heating to temperature t h a t w i l l cause silver solder to flow freely, and testing j o i n t after making repairs. Only the following component parts of compressor are available f o r service: compressor u n i t valve plate assemblies, suction service valve, discharge service valve, cylinder head, gaskets, muffler assemblies, shaft seal and support brackets. The compressor refrigerant oil may be replaced or corrected to proper level. A n y damage to pistons, cylinders, crankshaft or connecting rods, requires replacement of complete compressor assembly. 2L MEASURING COMPRESSOR OIL LEVEL N O T E : If the oil level is checked immediately after a long, fast trip, the oil level will be slightly lower than normal. Locate the a i r condition operating lever on "Cold", blower " H i g h " , toggle switch "Cool", car windows open. Start engine and operate at 1200 r.p.m. for about 10 minutes to r e t u r n any excessive o i l i n system to compressor crankcase. Stop engine and remove protective caps f r o m discharge and suction service valves. Close both valves by t u r n i n g valve stems clockwise w i t h Tool C-3361 u n t i l valves are seated firmly. N O T E : The engine should never be started with the discharge or suction service valve closed. Clean area around the compressor filler plug and discharge service valve p o r t cap w i t h solvent and blow d r y w i t h compressed air. Carefully loosen the y± inch flare cap f i t t i n g of the discharge service valve one-quarter of a t u r n and gradually release or purge the gas pressure f r o m the compressor. When the pressure i n compressor is completely purged, loosen (do not remove) the oil filler plug on side of com- 1 The correct oil level is f r o m 2 to 2 /£ inches. A d d M O P A R a i r conditioning compressor o i l (300 Saybolt at 100 degrees F . ) , as required, or siphon off excess o i l i f necessary. A f t e r oil level has been checked and corrected, replace the filler oil plug. To purge air out of the compressor cylinder and crankcase, make sure cap on the discharge valve service p o r t is loosened approximately one-half t u r n . U s i n g Tool C-3361, slightly open the suction service valve stem (counter-clockwise) . L e t gas d r i f t slowly t h r o u g h compressor for about 10 seconds. Tighten cap on the discharge service port. Back-seat both discharge and suction service valves by t u r n i n g the valve stems (counterclockwise) . Replace protective caps on the discharge and suction service valves and tighten securely. 22. REMOVAL AND INSTALLATION O F AIR CONDITIONING UNIT a. Removal F r o m inside the passenger compartment, remove the hydraulic actuator piston, bracket, and operating linkage. F r o m the engine compartment, d r a i n a n t i freeze f r o m radiator. Remove a i r cleaner. Remove i g n i t i o n d i s t r i b u t o r cap and base assembly, i f necessary. Disconnect upper and lower hot water heater hose f r o m evaporator cover outlet. Disconnect blower and wires f r o m Aero connector. Remove blower to dash attaching bolts, including blower motor ground w i r e to dash, and remove blower and assembly. Remove a i r conditioner evaporator cover to dash attaching bolts, and remove cover assembly. ( F i g . 25.) Remove thermal switch leads. "Discharge the System", as outlined i n Paragraph 11. Disconnect suction and liquid line. Remove rem a i n i n g evaporator housing flange to dash screws and remove evaporator by depressing fresh air door w i t h screw d r i v e r as evaporator is rolled out of dash pocket. CHRYSLER SERVICE MANUAL AIR CONDITIONING—449 : LOWER HCUS:KG CONNECTOR S ' ,WA-I% •* ' ' / EVAPORATORl ' -^f ^wL M -LENUM CHAMBER DRAIN TUBES? 1 .y" SUCTION LINE FIT TING /DISCHARGE LINE FITTING S^rJ; 57x6'*' Fig. 25—Heater-Air Conditioning Unit Installed NOTE s Whenever the air conditioning unit is removed from car, cooling coil fins should be cleaned and the water outlet drains should be checked for being open before reinstalling. b. Installation a. Removal Discharge the system, as outlined i n Paragraph 11. CAUTION Install unit i n the reverse order of removal. Evacuate, sweep and charge system, as i n dicated i n Paragraphs 12 and 16. Install blower and heater hoses. Check system for leaks, the fan belt for proper tension, and make certain radiator contains sufficient coolant. Protect eyes with goggles before disconnecting receiver flare connections. Disconnect flared connections at both ends LIQUID LINES 23. REMOVAL OF HEATER CORE Remove heater core to evaporator housing attaching screws. Carefully slide core assembly to left and remove core. CAUTION Use care when removing core to avoid damaging equalizer lines. 24. REPLACEMENT OF RECEIVER STRAINERDRIER (Fig. 26). Wherever the receiver strainer-drier unit is plugged and has to be removed from car, proceed as follows: Fig. 26—Receiver Drier Installed 450—AIR CONDITIONING CHRYSLER SERVICE MANUAL of receiver. Remove attaching bolt nuts f r o m bracket and remove receiver. Cap open lines i f new receiver is not to be installed immediately. Leave caps on connectors u n t i l ready to install. 12. Charge system w i t h three pounds of ref r i g e r a n t , as outlined i n Paragraph 16. 26. REMOVAL A N D INSTALLATION OF EXPANSION VALVE a. Removal b o Installation Position receiver i n place, install bracket attaching bolts, and tighten nuts securely. Remove caps, connect flared connector nuts and tighten securely. Charge system w i t h p a r t i a l charge and test f o r leaks. Correct any leaks and evacuate system, as outlined i n Paragraph 12. Charge w i t h three pounds of refrigerant, as outlined i n Paragraph 16. 25. REPLACEMENT OF RECEIVER STRAINERDRIER FUSIBLE PLUG (Without Removal From Car) (Fig. 26) Replacement of damaged fusible plug can be made w i t h o u t removal of u n i t f r o m bracket assembly. Discharge the system and remove the old fusible plug. A p p l y r e f r i g e r a n t oil to threads of new plug, and install plug i n receiver. T i g h t en to 20 foot-pounds torque. Never replace a damaged fusible plug w i t h a pipe plug. Evacuate system, as outlined i n Paragraph Disconnect the % inch and y% inch line fittings. NOTE t Use two flare wrenches to loosen or tighten fittings. Remove the valve control b u l b . CAUTION Cap or p l u g open lines to prevent moisture f r o m entering system. b. Testing Expansion Valve (Equipment Required) (Fig. 27) Source o f d r y a i r 90 to 250 psi. Moisture detecting eye w i t h d r i e r cartridge (save w h i t e plastic c a p ) . A i r Conditioning gauge set manifold. Transmission t h r o t t l e pressure gauge. Compressor capacity test cap w i t h .020 inch bleed hole. AIR CONDITIONING GAUGE S E T M A N I F O L D TRANSMISSION THROTTLE PRESSURE GAUGE ADJUST TO A N D MAINTAIN 7 0 P.S.I EQUALIZER CONNECTION EXPANSION VALVE ON T E S T MOISTURE D E T E C T I N G E Y E DRIER CARTRIDGE TO SOURCE OF DRY AIR SUPPLY 9 0 TO 2 5 0 P . S . I CONTAINER 57 X 500 flare ICE a WITH WATER Fig. 27—Testing Expansion Valve (Unit Removed from C a r ) ^COMPRESSOR CAPACITY TEST ORIFICE C A P ( . 0 2 0 " BLEED HOLE) "SENSING BULB CH1YSLE1 SE1¥ICE MANUAL AIR CONDITIONING—451 Container w i t h ice and water to hold temperature at 32 degrees F. 1/4 inch copper tubi n g and fittings as used i n attached drawing ( F i g . 27). 5. Remove sensing bulb from water bath and w a r m bulb i n hand. W i t h expansion valve i n let pressure still reading 70 psi. (adjust i f necessary), the outlet pressure should rise to a pressure of not less than 53 psi. c. Test Procedure I f expansion valve successfully passes these tests, i t may be considered to have the proper super heat setting, a proper pressure limit valve, the rated capacity and that i t has not lost its thermal charge. The valve should, therefore, give satisfactory performance. I f expansion valve fails to pass either test No. 4 or No. 5, i t should be rejected. 1. Direct source of dry air, 90 to 250 psi. through moisture detecting eye w i t h drier cartridge attached to insure against any moist vapors or particles of d i r t entering the valve. 2. W i t h the left hand shut-off valve on gauge set manifold closed and the r i g h t hand valve open, the right hand gauge w i l l indicate the pressure of the air supplied. Slowly open the left hand shut-off valve (counter-clockwise) until left gauge indicates 70 psi. 3. Immerse the expansion valve sensing bulb into the water and ice bath (32 degrees F . ) . t 4. W i t h the expansion valve inlet pressure gauge (left hand gauge) reading 70 psi., the sensing bulb completely submerged i n the 32 degree F. water bath, and the compressor test cap bleeding off pressure, the outlet pressure gauge should read between 23 and 26 psi. RETAINER W!R DISCHARGE-VALVE REED STUD 12) DOWEL (2)SUCTION-VALVE REED. PISTON RETAINER CONNECTING ROD VALVE CAP BEARING INSERT CRANKSHAFT • t r RING FRONT BEARING RETAINER BOLT (6) SPRING HOLDER SPRING BAND OUTER SHELL FRICTION RING SEAL SEAT " O " RING d. Installation Reinstall expansion valve, control bulb, and equalizer lines i n the reverse order of removal. Tighten all connections securely, and sweep and charge system, as indicated i n Paragraphs 13 arid 17. 27. REMOVAL AND INSTALLATION OF COMPRESSOR (Fig. 28). Discharge the system, as outlined i n Paragraph 11. Remove the suction and discharge lines. WASHER (2) -SPECIAL BOLT (7) - ^-CYLINDER HEAD - GASKET -SPRING (2) -VALVE STOP -•-VALVE PLATE X GASKET y PISTON RING ^RETAINER /SCREWS (2) SERVICE , DISCHARGE ' VALVE .GASKET -SCREEN -GASKET SUCTION "SCREW .SERVICE VALVE *—CAP BOLT ' '(»" FACE PLATE BRUSH ASSEMBLY BOLT -MAGNETIC CLUTCH Fig. 28—Disassembled View of Compressor GASKET OIL SUMP SPECIAL BOLT (6) VALVE CAP OIL PUMP COVER " O " RING NNER ROTOR \ DRIVE SHAFT OUTER ROTOR CRANKCASE BALL RELIEF VALVE SPRING 57x547 452—AIR CONDITIONING CHRYSLE1 SERVICE MANUAL CYLINDER HEAD™ CAUTION Plug or cap all lines as soon as they are disconnected to keep moisture out of the system. -* Disconnect magnetic clutch to control u n i t w i r e . Remove compressor pulley belts. Remove compressor to bracket attaching bolts and remove compressor. k f mm mm N O T E : W h e n replacing the compressor, i t is Imperative that the o i l i n the compressor be checked to the proper level ( 2 to 2 ^ inches). Refer to Paragraph 6 f o r measuring procedures. •rY'.>-'DER :-=AD G VALVE PLATE ASSEM\-:\' A ET Replace compressor i n the reverse order of removal and adjust f a n belt. 28. REMOVING COMPRESSOR CYLINDER HEAD W i t h gauge set installed as indicated i n Paragraph 6, rotate discharge and suction service valve stems clockwise u n t i l both valves are f u l l y front-seated. Slowly open the discharge gauge hand valve slightly to relieve compressor pressure t h r o u g h the center outlet hose and into an exhaust suction system. When pressure drops to zero on discharge gauge, open suction pressure gauge hand valve. VALVE PLATE AMD HEAD REMOVING LIP ' -VALVE PLATE GASKET 57x683 Fig. 30—Replacing H e a d Gasket Remove compressor cylinder head bolts and tap the head off w i t h a brass d r i f t or plastic hammer. N O T E : Use tab ( F i g . 2 9 ) located at side of cylinder head to tap off head. I f when l i f t i n g the cylinder head the valve plate does not separate f r o m head, separate head f r o m plate by using a brass d r i f t to tap against head and plate. CAUTION CYLINDER HEAD PILOT STUDS(fQOD ' *> \ VALVE PLATE ASSEMBLY 57x682 Fig. 29—Removing Compressor Head To avoid damaging the finished surfaces, do not tap the plate near the edge of plate or head. A f t e r removal of head, plate, and gaskets, examine valves; i f valves are broken and damage extends to cylinder bores, replace compressor. I f compressor is not damaged, clean the surfaces of cylinder block, valve plate and head thoroughly. Use care to remove a l l shreds of old gasket f r o m plate, block and head surfaces, clean attaching stud holes i n block. D i p new gaskets i n clean r e f r i g e r a n t o i l . Handle new gaskets carefully. N O T E : Both head and valve plate gasket can AIR CONDITIONING—453 CHRYSLER SERVICE MANUAL AIR GAP only be assembled in one position. See Figure 30 for method of correct assembly. Install cylinder head gasket, valve plate and valve plate gasket and cylinder bead. Place assembly on cylinder block and align the assembly to cylinder. Install attaching bolts, tighten each bolt alternately and evenly to 26 footpounds torque. Purge air from the compressor by opening the suction service valve (counter-clockwise) slowly and loosening the discharge service port cap for a few turns for about 10 seconds. This w i l l allow the gas to d r i f t through the compressor and bleed a i r f r o m the system. Rotate both discharge and suction service valves (counterclockwise) u n t i l they are fully back-seated. Start engine and locate control lever on "Cold". Operate engine for five minutes, stop engine, and test for leaks, as outlined i n Paragraph 9. I f there are no leaks and the system is operating satisfactorily, remove gauge set and replace valve caps. 29. SEBFICING THE MAGNETIC CLUTCH (Fig. 31) AJK V 3 A r .025 TO .035 INCH ^ ...... " 54 605 x Fig. 32—Air G a p Adjustment a. Testing Electro-Magnet Current Draw To test the coil for a short or open circuit, connect an ammeter (0-10 Ampere Scale) i n series w i t h a fully charged 12-volt battery and the insulated brush lead. The current draw at 12 volts should be 1.5 to 2 amperes. b. Removing Clutch Assembly from Compressor Servicing the magnetic clutch assembly is l i m ited to the drive plate, pulley and electromagnet assembly, snap rings, bearing and brush holder assembly. CAUTION DO NOT attempt to remove the electro-magnet coil from the pulley assembly. The coil is held in place by a special adhesive material. Once this bond is broken the coil cannot be re-attached. DRIVE PLATE AND FACING ASSEMBLY Loosen and remove the belts. Remove the upper r i g h t shroud section. Remove special locking bolt and washer from compressor crankshaft at f r o n t center of clutch. Do NOT damage brushes when removing or installing clutch. While supporting clutch assembly w i t h one hand remove the pulley w i t h % inch cap screw, screwed into end of clutch shaft. c. Removing and Installing Drive Plate Remove drive plate retaining snap r i n g hub ( F i g . 31) w i t h Tool C-3301. Place suitable sleeve against hub and remove drive plate by tapping against sleeve w i t h a soft hammer. Inspect springs for loss of tension and ( o r ) cracks, and inspect liner on face of plate. Replace drive plate i f liner is worn, springs are weak or broken, or i f drive plate is warped. ( A sintered iron liner impregnated w i t h f i brous material is bonded to the drive plate). Fig. 31—Magnetic Clutch (Disassembled View) Start drive plate hub squarely into inner bearing race. Place a brass d r i f t against the drive plate inner hub and tap plate hub into bearing by tapping on brass d r i f t w i t h a hammer while supporting the inside race. Install G A U G E SET MANIFOLD ASSEMBLY TOOL C-3354 THERMOMETER CLIPS C-3421 FLARE NUT WRENCHES CAPACITY TEST CAP TOOL SP-2922 53x240S FLARE REFACING TOOL C-3367 FREON CYLINDER ADAPTER C - 3 4 2 0 THERMOMETER SET TOOL C-3356 Fig. 33—Special Heater-Air Conditioning Tools FREON WEIGHING SCALE C - 3 4 2 9 — CHRYSLER SERVICE MANUAL snap r i n g on drive plate hub. Use a long feeler that w i l l reach into gap at hub and measure air gap between drive plate and electro-magnet (Fig. 3 2 ) . A i r gap should measure .025 to .035 inch. Adjust air gap by t u r n i n g the three screws on the front face of the drive plate. Adjust all three screws to obtain an evenly spaced a i r gap. AIR CONDITIONING—455 (at outer race of bearing) from pulley assembly. Tap bearing from pulley assembly. Install bearing and snap r i n g and drive plate. e. Installing Clutch Assembly on Compressor d. Removing Clutch Bearing A l i g n key and keyway and push assembly over shaft and key. Install self-locking bolt and washer. Install upper r i g h t shroud section. Purge air f r o m the compressor, back-seat both service valves, and tighten oil filler plug. Remove drive plate, as outlined i n Paragraph 29, "c". Remove snap r i n g and grease slinger For A i r Conditioning Service Tools refer to Figure 33. SERVICE DIAGNOSIS No attempt should be made to use the diagnosis information as a method of trouble shooting or spot checking. When properly used (as an aid to the complete test procedure), the diagnosis w i l l be of considerable value to the service man. 30. BLOWEB NOT OPERATING a. Test electrical circuit w i t h point-to-point voltmeter test. Replace or repair broken wire. b. Test motor, and repair or replace. c. Test switch w i t h voltmeter or j u m p wire. Replace faulty switch. d. Test circuit w i t h voltmeter for voltage drop. Clean and tighten all loose connections. 31. BLOWERS AND COMPRESSOR OPERATING—NO COOLING a. Check for low refrigerant. Recheck system after testing and repairing all leaks. b. Test f o r moisture w i t h dry-eye. c. Test compressor capacity. d. Test f o r restriction i n strainer-drier, as outlined i n Paragraph 24. Inspect lines for kinks. e. Test expansion valves, as outlined i n Paragraph 26. Clean or replace valve. 32. BLOWERS OPERATINGPARTIAL COOLING a. Check sight glass for indication of low refrigerant. Check for leaks, and charge system. b. Test for moisture. c. Test compressor capacity, as outlined i n Paragraph 6. d. Test thermal switch, as outlined i n Paragraph 17. e. Inspect condenser for kinks or obstructions. Clean w i t h a i r or replace. f. Clean air passages through condenser w i t h w a r m water and compressed air applied from side next to engine. g. Test temperature-pressure relation of refrigerant. 33. LOW SUCTION PRESSURE AND LOW HEAD PRESSURE a. Check sight glass for indication of low refrigerant. Check for leaks, and charge system. b. Test for moisture. c. Test compressor capacity. d. Test for restricted strainer-drier, as outlined i n Paragraph 24. Replace i f faulty. e. Check for kinked liquid line. Replace liquid line i f required. 34. SUCTION PRESSURE O. K. AND HIGH HEAD PRESSURE a. Check for air i n system. Open gauge manifold discharge pressure valve slightly, and leave open for 10 seconds to purge air. Close 456—AIR CONDITIONING valve, s t a r t engine, and recheck gauge sure at 1200 r . p . m . CHRYSLER SERVICE MANUAL pres- h. Check f o r too m u c h r e f r i g e r a n t . Operate engine at 1200 r . p . m . w i t h blower s w i t c h t u r n e d to " H i g h " . Discharge r e f r i g e r a n t slowly t h r o u g h gauge m a n i f o l d center fitting u n t i l bubbles appear i n s i g h t glass. Charge system w i t h r e f r i g e r a n t , as outlined i n P a r a g r a p h 16. c. Wash out condenser w i t h w a r m w a t e r and apply compressed a i r f r o m side next to engine. 35. L O W SUCTION PRESSURE— HEAD PRESSURE O. 1 . a. Test f o r moisture. b. Test f o r r e s t r i c t e d receiver-strainer. c. Test super heat. 38. TESTING FOR LEAKS W I T H LEAK DETECTOR (For Diagnosis) W h e r e a system has been found to be l o w on r e f r i g e r a n t or f o l l o w i n g repairs on the system t h a t necessitated the opening o f a connection, i t is necessary to test f o r leaks, as described i n P a r a g r a p h 9.
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