Air Conditioning System Performance Test

Air Conditioning System Performance Test
Service Bulletin
Applies To:
1994 and Newer except Passport – ALL with R-134a A/C
96-012
July 5, 2000
Air Conditioning System Performance Test
(Supersedes 96-012, dated March 6, 1996)
If your customer complains of poor A/C performance,
use these measurements and charts to determine
whether the A/C system is working within specs.
NOTE: For the Passport, refer to Diagnosis (under A/C
System) in the HVAC section of the appropriate service
manual.
WARRANTY CLAIM INFORMATION
In warranty: The normal warranty applies.
Submit this information along with the operation
number and flat rate time for any procedure in the flat
rate manual that requires discharging, repairing,
evacuating, and recharging the A/C system. Attach a
completed copy of the A/C System Performance Test
form to the warranty copy of the repair order.
• Do not use this performance test as the primary
operation number on the warranty claim.
• Do not claim time for a performance test in a
warranty claim based on a service bulletin. Bulletins
specify the problems and the repair, so a general
performance test is not needed.
Operation Number: 622001
Flat Rate Time:
0.5 hour
Defect Code:
060
Contention Code: B01
Out of warranty: Any repair performed after warranty
expiration may be eligible for goodwill consideration by
the District Service Manager or your Zone Office. You
must request consideration, and get a decision, before
starting work.
SETUP
Do these steps before you begin the test. If you do not,
you will get inaccurate readings.
1. Move the vehicle out of direct sunlight, and let it
cool down. The exterior should cool down to the
temperature of the air around it before you begin.
2. Clean the condenser. If the airflow through the
condenser is restricted, the A/C system may seem
fully charged when it is actually low on refrigerant.
3. Close the doors and windows. With the engine
running at 1500 rpm, turn on the A/C and select
Recirc. Run the blower on high for 15 minutes.
 2000 American Honda Motor Co., Inc. – All Rights Reserved
TEST PROCEDURE
Do these pressure and temperature checks. Take the
measurements with the compressor running, just
before it cycles off.
1. Connect the R-134a recovery/recycling station to
the A/C system.
2. Measure the air temperature 12 inches in front of
the vehicle with the fans running. Write down this
ambient temperature on the Air Conditioning
System Performance Test form (Y0430).
3. Check the A/C system pressures on the low and
high sides with the engine running at 900 rpm
(1100 rpm or slightly higher on 1998 and later Civic
and CR-V). Write down the pressure readings on
the form.
• Do not check A/C system pressures if the
compressor is off. If the compressor does not
stay on, increase or decrease the engine rpm
until it does, but do not exceed 1100 rpm (except
for 1998 and later Civic and CR-V).
• For the Odyssey, make sure the fan for the rear
A/C is off.
NOTE: On the 1998 and later Civic and CR-V, the
compressor will not cycle with the engine running at
a steady 1000 rpm. You must run the engine at
1100 rpm, or slightly higher.
4. Odyssey only: Turn the rear A/C fan unit on high.
Check the A/C system pressures on the low and
high sides with the engine running at 1000 rpm.
Write down the pressure readings on the form.
5. Measure the outlet air temperature at the center
vents, and write it down on the form.
6. Odyssey only: Measure the outlet air temperature
at the vents in the rear A/C unit, and write it down
on the form.
NOTE: Do not insert the temperature probe more
than 2.5 inches into the vent.
7. Check the A/C system pressure on the low side
with the engine running at 3000 rpm, and write it
down on the form.
8. Measure the outlet air temperature at the corner
vents with the engine running at 3000 rpm, and
write down both readings on the form.
9. Compare your readings to the pressuretemperature charts on the form to determine if the
A/C system is working within specs.
ATB 17709-21714 (0007)
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CUSTOMER INFORMATION: The information in this bulletin is intended for use only by skilled technicians who have the proper tools, equipment,
and training to correctly and safely maintain your vehicle. These procedures should not be attempted by “do-it-yourselfers,” and you should not assume
this bulletin applies to your vehicle, or that your vehicle has the condition described. To determine whether this information applies, contact an
authorized Honda automobile dealer.
Air Conditioning System Performance Test
(Refer to Service Bulletin 96-012)
320
300
280
260
240
220
High Side
Pressure (PSIG)
200
180
160
140
120
100
80
60
65
70
75
80
85
90
95
100
105
110
115
120
Ambient Temperature (°F)
(Air temperature around the vehicle)
50
45
Center Vent
Temperature (°F)
40
35
32
10
Ambient temperature
All Vehicles:
Low side pressure (900 rpm*)
High side pressure (900 rpm*)
Odyssey Only:
Low side pressure (1000 rpm)
High side pressure (1000 rpm)
15
°F
20
25
30
Low Side Pressure (PSIG)
(PSIG) (Odyssey: rear A/C OFF)
(PSIG) (Odyssey: rear A/C OFF)
(PSIG) (Rear A/C ON)
(PSIG) (Rear A/C ON)
*Exception:On 1998 and later Civic and CR-V, run the
engine at 1100 rpm or slightly higher
Center vent temperature
Rear vent temperature (Odyssey)
Low side pressure (3000 rpm)
Left corner vent temperature
Right corner vent temperature
°F
°F
(PSIG)
°F
°F
Attach this form to the repair order
Reorder No. Y0430
TEST RESULTS
Here are some problems that cause test results to be out of specification. For more information, refer to the
Pressure Test chart in the HVAC section of the appropriate service manual.
TEST RESULTS
Pressure on the high side is too high.
PROBABLE CAUSE
Restricted airflow through the condenser.
Condenser or radiator fan is not working.
Restricted refrigerant flow through the A/C system.
Pressure on the high side is too low.
A/C system is not fully charged.
Pressure on the low side is too low, and the outlet air temperature
from the right corner vent is about 10 degrees colder than the left.
Restricted refrigerant flow through the evaporator.
Low refrigerant charge.
Outlet air temperature from the center vents is too high.
Air mix and heater control valve cables are out of
adjustment.
Outlet air temperature from the corner vents differs by more than
10 degrees.
Air mix and heater control valve cables are out of
adjustment.
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96-012
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