It`s a New Tech 2 Look

It`s a New Tech 2 Look
July 2000
Volume 2, No. 7
It’s a New Tech 2 Look
In early July, your dealership will
receive TIS data CD 13. Once your
Techline terminal and Tech 2 are updated
with this release, you’ll notice your Tech
2 has a new look – and some different
functions – while using the Service
Programming System (SPS) application.
In an effort to develop more common
programming for the Tech 2 between
North America and International operations, GM Service Operations has taken
the opportunity to update the Tech 2
functionality and logic as well. The result
is a Tech 2 scan tool that provides users
with more information while programming a vehicle along with more intuitive
user interaction that makes the SPS
application easier to use. And if you’re
ever in Europe, you’ll be able to use it
there too.
The changes made to the Tech 2
include some differences in the navigation from screen to screen, but the fundamental steps and procedures are the
same. When performing remote reprocontinued on page 2
Techline News
SI 2000
GM dealerships
recently received the latest set of Service
Information 2000 (SI
2000) CDs, version
2000.07. It includes service information on 35
new vehicle platforms.
By updating the personal
computers (PCs) in the
service department that
run SI 2000, the latest
service information will
be available in the dealership before many of
those models hit the
For GM dealerships
in the U.S., new versions of the SI 2000
CDs will be released to
GM dealerships about
six times during the
year. In between those
CD releases, SI 2000
service information will
be updated via satellite
broadcasts to GM dealerships’ GM ACCESS
servers every two
weeks on a Friday night.
Check every other
Monday to see if your
dealership has received
new service information.
By providing dealerships with updated information through satellite
broadcasts, dealerships
will receive timely information with fewer CDs
to handle.
Instructions for updating a PC with an SI
2000 incremental update
are available under the
SI 2000 Help menu.
Under the Help menu,
select "Checking your
version number" to see
the current version of SI
2000 running on the PC.
From here, the current
version is displayed,
along with the release
date of the next available incremental update
and a link to the instructions for updating the
PC for both Microsoft
Internet Explorer and
continued on page 3
It’s a New Tech 2 Look . . . . . . . . . . . . . . . . . . .1
Downloading SI 2000 Incremental Updates . . . . .1
Cooling System Contamination . . . . . . . . . . . . . .4
Sentinel Dealers Offer Insight on Product Quality . .5
New Satellite Training Locations Open . . . . . . . . .6
A View from Inside the Warranty Parts Center . . .6
TAC Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Dinghy Towing Tips . . . . . . . . . . . . . . . . . . . . . .7
TechLink on the Web . . . . . . . . . . . . . . . . . . . .8
Bulletins . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Service Operations
perform service programming
on these vehicles than with
the direct programming
method of hooking up the
vehicle and Tech 2 directly to
the Techline terminal using
an RS-232 cable.
There are new screens to build a vehicle.
gramming, for example, it’s still the
same three-step process that requires
requesting information from the control
module (or the electronic
control unit, ECU, as it is
now called on the Tech 2),
uploading that data to TIS to
see the available calibrations, and then returning to
the vehicle to program the
Other changes to the
Tech 2 include more information on the screens that help
guide the user through the
procedures. One of the goals
when developing the new
Tech 2 screens was to help
technicians understand what
is happening at each stage of
a procedure.
The screens now offer
better explanations of the user options
and what can be done next – all to help
avoid mistakes. After information has
GM TechLink is a monthly magazine for
all GM retail technicians and service
consultants providing timely information
to help increase knowledge about GM
products and improve the performance
of the service department. This magazine is a companion to the GM Edge
VSSM Communications
Gracemary Allen
Publisher & Editor:
Mark Stesney
GM Service Operations
[email protected]
Technical Editors:
Mark Spencer
[email protected]
Jim Horner
[email protected]
More Information
and Support
Production Manager:
Marie Meredith
One of the biggest
changes is that with the
updated software, the Tech
2 will now support Keyword
Protocol 2000. This means
you can use remote programming when working on The new screens offer more information.
a Cadillac Catera or Chevy
been requested from an ECU, for examTracker. Keyword Protocol is a type of
ple, the Tech 2 will display the message,
communications protocol used by those
"Request info. is complete. Tech 2 is
models, just as most North American
ready to connect to PC."
GM models use Class 2 communication
or older models use UART. As you can
Since many of the screens are new,
imagine, this will make it a lot easier to
it’s important to take the time to read
each screen so that you’re
sure you know exactly what
the next button push will
"Building" a
Previously, when
Service Programming was
selected from the main
screen, it was necessary to
build the vehicle – in
essence, tell the Tech 2 the
vehicle you’re working on –
before requesting any information from the vehicle.
After successfully request-
Desktop Publishing:
Greg Szpaichler, MediaWurks
[email protected]
FAX number:
Write to:
PO Box 500
Troy, MI 48007-0500
General Motors service tips are intended for use by professional technicians,
not a "do-it-yourselfer." They are written
to inform those technicians of conditions that may occur on some vehicles,
or to provide information that could
assist in the proper service of a vehicle.
Properly trained technicians have the
equipment, tools, safety instructions
and know-how to do a job properly and
safely. If a condition is described, do not
assume that the bulletin applies to your
vehicle or that your vehicle will have
that condition. See a General Motors
dealer servicing your brand of General
Motors vehicle for information on
whether your vehicle may benefit from
the information.
Inclusion in this publication is not necessarily an endorsement of the individual
or the company.
Copyright© 2000 General Motors Corporation
All rights reserved.
The Tech2 now provides simple direction.
Return to page 1
ing vehicle information and uploading
that information to the TIS terminal, it
was necessary to build the vehicle again
before programming.
Now, with the new changes that
have been made, the Tech 2 will only
ask you to build a vehicle when it needs
to know that information. Specifically,
that’s when you’re about to request
information from an ECU. The user is
presented with a screen that lists vehicle
makes, and then up to five additional
screens identifying vehicle data such as
model year and vehicle type.
Once a vehicle has been built in the
Tech 2, that data is now stored until
reprogramming has taken place or information is requested again from an ECU,
in which case the vehicle will need to be
built again.
keys available.
Before reprogramming an ECU, double check to make sure you’re reprogramming the same ECU from which
information was requested.
New Soft Keys and
When reprogramming the Vehicle
Theft Deterrent (VTD) system, for
example, there are just two selections
available: Request info. and Program.
Previously, there were soft keys for
VTD, PIN display and content theft
information. By simplifying the number
of keys, and in turn, the number of
choices, it’s easier to use the tool.
Now, simply request information from
the ECU in the system you’re working
on or program the ECU.
In several procedures, you’ll notice
that the new screens on the Tech 2
have different soft keys than in the
past. Or there may not be any soft
keys available at all. In these cases,
there are new selections or function
To use all the latest Tech 2 screens
and their added functionality, remember to update your Tech 2 with TIS
data CD 13.
– Greg Powell contributed to this article.
And remember, when replacing an
ECU it’s necessary to request the security code from the new ECU, not the one
being replaced.
continued from page 1
Downloading SI 2000 Incremental Updates
2000.07.02 for the current
version will be stored on the
GM ACCESS server until an
incremental update of the
next version release,
2000.08, has been broadcast.
Incremental update
2000.08.01 will erase any
previously released updates.
Updating the PCs in the
service department with the
SI 2000 incremental update
may take up to one hour,
depending on the activity on
the dealership’s GM ACCESS
server as well as the performance and speed of the PCs.
Since a PC cannot be used
while being updated, and
high amounts of activity on
the server slow the updating
process, it’s recommended to
Instructions for updating SI 2000 is available for both
Internet Explorer and Navigator users.
Netscape Navigator users. If
the incremental update has
not been released yet and is
not available on the dealership’s GM ACCESS server, a
"page not found error" will be
displayed when the link is
When updating SI 2000
on a PC, each SI 2000 incremental update must be
downloaded in order. They
cannot be executed on the
PC out of the order of their
release. This is because each
update includes only new
perform the SI 2000 incremental updates when there is
a low demand on the dealership’s computer network.
As the incremental
updates to the CD versions
of SI 2000 are broadcast to
U.S. dealerships, the SI 2000
Web site also is updated at
the same time. Currently, to
access SI 2000 on the Web,
log on to and
enter your password and ID.
If your dealership does not
have a password and ID for
the SI 2000 Web site, contact
your dealership’s Regional
representatives for the necessary access information.
– Lisa Scott, Mike
information and is not a
cumulative collection of previously released information.
All the information from each
incremental update is compiled on the next release of
As the incremental
updates are broadcast to the
dealership every two weeks,
they are stored on the GM
ACCESS server. They will
stay on the server until the
next version of SI 2000 CDs
is released. For example,
updates 2000.07.01 and
The expected broadcast date of the next update can be found
under the Help menu.
Return to page 1
Cooling System
Conditions on
Vehicles Equipped
with DEX-COOL™
General Motors made DEX-COOL™
Extended Life Coolant standard equipment in all North American-built vehicles
(except Saturn) beginning in the 1996
model year. Some assembly plants made
the conversion over the 1995 Memorial
Day shutdown, and all remaining plants
were converted for the 1996 model startup. For the post-Memorial Day built 1995
models filled with DEX-COOL™ and all
1996 models, the coolant
maintenance/change interval is 5 years or
100,000 miles, whichever occurs first. In
1997, that interval was increased to 5
years or 150,000 miles, whichever occurs
first, which is where it remains today.
Several important factors contributed
to the decision for GM to be a pioneer in
the conversion to extended life coolant.
The convenience and financial benefit to
the customer of not having to change
coolants as often is obvious. Additionally,
the result of having less used coolant to
dispose of has the potential to result in
significant benefits to the environment.
GM also has realized significant increases
in water pump durability, and radiator and
heater core life.
DEX-COOL™ is a non-silicated
coolant, while most conventional green
coolants contain silicates. One undesirable property of silicates is that they are
abrasive and over time can contribute to
wear of water pump seals, as well as
other components.
Overall, DEX-COOL™ Extended Life
Coolant has performed very well in GM
vehicles. However, for a combination of
reasons, a few models experience varying degrees of contamination to the radiator cap and/or coolant recovery bottle. In
some cases, if the contamination is left
unchecked, it can cause problems in
other areas of the engine cooling system.
We’ll try to assist you in determining the
specific type of contamination present,
and discuss the most appropriate correction. We’re limiting our discussion to
cooling systems that use a drop-center
design radiator cap, and a non-pressurized coolant recovery bottle.
The Radiator Cap
When a cooling system is not full, the
air pocket that is created in the radiator
provides a "beachhead" where contaminants can deposit. This occurs much like
sand is deposited by waves on the
beach. In cooling systems that use a
drop-center cap and non-pressurized
coolant recovery bottle, these contaminants can deposit in the valve mechanism of the radiator cap. Once the cap
becomes contaminated and ceases to
function as designed, chances are that
the system will begin to lose additional
coolant more rapidly. This is because
once the radiator cap fails to hold pressure, a 50/50 mix of coolant and water
will boil at 226 degrees Fahrenheit,
instead of 265 degrees Fahrenheit, at 15
PSI. By boiling at a lower temperature, it
is much easier to exhaust the capacity of
the coolant recovery bottle as the coolant
expands through the failed cap at the
lower temperature. When the system
cools off, less coolant will then be available to be drawn back into the radiator.
After several cycles under these conditions, the level of coolant in the radiator
can be significantly reduced and the
coolant recovery bottle will be empty.
It is for this reason that the condition
and functional ability of the radiator cap is
so important. Always test the functional
performance of any radiator cap whenever cooling system performance is in
question, and replace any cap that does
not hold the specified pressure. When
removing a radiator cap, be sure to wipe
off all sealing surfaces prior to replacement, in order to ensure a proper seal.
There are only a few models where
the system design appears sensitive to
this type of contamination. Although the
contaminant may be similar looking, different models usually have different recommended repairs. That’s because the
makeup of the contaminant is often characteristic to a model or engine family.
Because of this, each model should be
carefully evaluated to assure the appropriate repair is being made.
The most effective method of preventing, minimizing or eliminating the
affects of contaminants is to always
maintain the cooling system (including
the recovery bottle) at its recommended
full level and ensure the radiator cap is
functioning properly.
S/T Truck Equipped
with 4.3L V6
Bulletin 99-06-02-012B outlines the
most effective repair for this model.
The contaminant has been identified as
iron oxide, and the cleaning material
recommended in the bulletin was
selected because it was proven to be
the most effective at cleaning this type
of contaminant. It is very important to
follow the steps outlined in the bulletin
precisely. Cases where the procedure
was not effective have almost always
been traced to substitution of another
cleaning material or the procedure was
not strictly adhered to. The most common mistakes have been:
cleaning will not be effective.
2. Failing to correctly assess the level
of contaminants in the radiator before
NOTE: As stated in the bulletin, it’s
important to determine if coolant is able
to flow through the third row down from
the top of the radiator. If not, the radiator
core must be replaced before the flush
procedure. This is because the cleaner
must be able to flow past the contamination in order to clean it. In cases where
the system can’t achieve sufficient flow
around the contaminants, the cleaner
cannot be effective.
W Car / U Van Equipped
with 3.1L or 3.4L V6
Bulletin 00-06-02-004 describes the
appropriate repair procedure for the
issues most often seen on these models.
Although similar in appearance to the S/T
issue, the material on the radiator caps of
these models contains no iron oxide. It is
much more gelatin-like in texture and is
usually comprised of sealer pellet
residue, hose material and/or other contaminants. It is very rare to see cases
where the contamination evidenced on
these radiator caps has spread beyond
1. Running the flush while the
engine operating temperature is too
low. Heat acts as a catalyst in this
procedure, and if the temperature of
the system is not maintained according to the bulletin specifications, the
Return to page 1
Sentinel Dealers Offer
Insight on Product Quality
the radiator neck. If contamination is suspected beyond the
radiator neck, you may choose to remove the radiator end
tanks for further inspection.
Replacement of the radiator cap, wiping out the radiator
neck and topping off the system is all that is normally recommended for these models. Unless other symptoms are present, it is not necessary to flush the cooling system or replace
the coolant on these models before their published maintenance/change interval.
GM is constantly looking for ways to improve the
quality of its cars and trucks, and with the help of
many dealerships, is doing just that, along with
improving customer satisfaction.
The Sentinel Dealer Program is a voluntary program for GM dealerships where they contribute valuable insight about product quality issues and provide
details about customer product concerns.
Approximately 150 dealerships in the U.S. are currently participating in the Sentinel Dealer Program. As the
program grows, it will be rolled out to dealerships in
Canada and Mexico.
2000 LeSabre and Bonneville Equipped
with 3.8L V6
Concerns on these models typically center around what is
perceived as discolored coolant (usually dark and rust colored
in appearance) and a ring of contamination around the inside of
the coolant recovery bottle. Analysis has determined that both
of these consist of excess sealer pellet material that was inadvertently installed at the assembly plant. Sealer pellet installation has since been discontinued on these models. Cleaning
the coolant recovery bottle, topping up the system and checking the cap for proper function is all that is required on these
Dealerships are selected to participate in the
Sentinel Dealer Program based on several factors,
including geographic location, sales volume and product mix, and willingness to help resolve product
issues. Currently, participating dealerships also must
have an ADP or Reynolds & Reynolds computer system with an electronic repair order process.
Finally, as stated in bulletin 99-06-02-012B, the radiator cap
is not a good indicator of the general condition of the cooling
system. Typically
the underside of
the radiator cap will
exhibit a greater
amount of contamination than the rest
of the system, due
to the "beach"
effect described
earlier. Likewise,
the color of the
coolant is also not
a good indicator of
its general condition. Due to fading of the dyes used with DEX-COOL™, the
coolant in some vehicles may appear pink after time. The addition of sealer pellet (stop leak) material can turn the coolant
color to dark red or maroon. As a rule, color alone is not an
indication of the quality level of the coolant and does not affect
its performance.
The condition, cause and correction information
from the repair orders generated by Sentinel Dealers
is sent to GM through the WINS warranty system.
The WINS system captures the first 60 characters of
the condition line, the first 80 characters of the cause
line, and the first 60 characters of the correction line
and submits that information to be put into a GM quality database. Because of the limited amount of information that can be captured, it’s important for participating dealers to be concise when summarizing condition, cause and cor rection information on the repair
order. All of this quality-related data is made available
to more than 8,000 GM engineers at all levels of the
design, manufacturing and assembly processes.
One of the latest product issues GM is working on
is paint quality. GM North America Paint Engineering
is asking Sentinel dealers, as well as all other dealers,
to identify and provide feedback on warranty paint
repairs. All dealers who would like to participate are
asked to use a digital camera to take a digital picture
(jpg) of the area on a vehicle that needs warranty paint
repair and e-mail the file to North America Paint
Engineering. The file name of the picture should be
the last six digits of the VIN and e-mailed to
[email protected] along with the full VIN and a
contact name and phone number at the dealership.
When performing repairs for S/T trucks, U vans and W cars,
it may help to replace the standard radiator cap with a Standt
model 10230 or 11230 radiator cap. These caps have a spring
center design that may be less sensitive to the effects of low
coolant contamination. You should also top off the radiator and
fill the coolant recovery bottle to the hot mark when cold.
These measures will combine to guard against the vehicle
operating with the cooling system low on coolant. Inform the
customer to check the level of the coolant recovery bottle regulary and to maintain it at the proper level by adding a 50/50
mix of DEX-COOL and water whenever it’s found to be low.
DEX-COOL™ continues to perform extremely well in the
majority of GM vehicles, and has provided a competitive performance and environmental advantage. Other manufacturers
are recognizing these benefits. At present, in addition to all
North American-built GM vehicles, Texaco extended-life coolant
(DEX-COOL™) technology is either in use or approved for use
by several other European and North American manufacturers.
After reviewing the photo and the corresponding
warranty claim data, the information will be sent to
the quality manager at the responsible production
plant. The dealership will be supplied with feedback
about their paint issue, and what paint quality
improvements GM is going to take. The paint quality
program is set to run until September 1, 2000.
For those vehicles that may potentially be affected by contamination, the most effective method of eliminating any risk of
the contaminants is to maintain the cooling system (including
recovery bottle) at its full-recommended level, and ensure the
radiator cap is functioning properly.
Dealers who would like to participate in the
Sentinel Dealer Program to help GM improve product
quality should contact Jack Pantaleo, Sentinel Dealer
Program manager, at 1-248-874-3659.
– Jay Dankovich
– Jack Pantaleo
Return to page 1
New Satellite
Locations Open
Hands-on technician training may be coming closer to
your dealership. In addition to
the six regional GM Training
Centers, there will be 17 new
GM satellite training locations
opening soon at colleges and
other locations around the
These new satellite locations will offer hands-on training just as the regional training centers. The satellite locations, however, will not be
conducting body or endorsement courses. Several satel lite locations began holding
training classes last month
and more will open in the
coming months.
The satellite locations
were determined based on
dealership density, the number of technicians in the area
and commuting distances.
Any questions relating to the
satellite training locations can
be directed to the associated
Regional Training Center or
the GM STC Help Desk at
Hands-on course information as it relates to date(s)
and location(s) offerings can
be found in the schedule and
enrollment areas of the
Training Management System
(TMS) and in the monthly GM
Common Training Program
Guide and Schedule.
Atlanta Training Center,
Alpharetta, GA
(770) 888-1300
Satellite locations:
Seminole Community
College, Sanford, FL
Central Piedmont
Community College,
Charlotte, NC
New York Training Center,
Tarrytown, NY
(914) 631-4950
Satellite locations:
Allegheny Community
College, Pittsburgh, PA
A View from Inside the
Warranty Parts Center
Hudson Valley
Community College,
Troy, NY
Harrisburg Community
College, Harrisburg, PA
The community of Orion, Michigan, located about 25
miles north of Detroit, is the home of the GM Warranty
Parts Center (WPC). Regardless of where your dealership is located, if you’re asked to return a part that was
replaced under warranty, this is where it ends up.
You probably have questions about the warranty
parts return process, so TechLink recently visited the
WPC to obtain some answers.
Dallas Training Center,
Garland, TX
(972) 278-2196
How can I learn about the Corporate Parts
Return (CPR) Program?
Satellite locations:
Refer to bulletin 99-00-89-019, effective October 1,
1999. It pertains to all 2000 and prior passenger cars
and trucks and provides instruction about parts retention, preparing parts for shipping, and administration.
Community College,
Lees Summit, MO
How do I know which parts to return?
San Jacinto Community
College, Pasadena, TX
Dealers are notified which parts to return through
the Dealer Communication System twice per week.
Once a part is requested, the dealer has 28 days to
return the part. A debit is processed if the part is not
received within the time limit.
Community College,
New Orleans LA
The return request will list specific warranty claims
for which parts are to be returned. You should return
only the parts asked for, but do not include parts not
requested. Ship each individual request in a separate
box; do not batch multiple requests in a single box.
Ranken Community
College, St. Louis, MO
Training Solutions
(Snap-on), Memphis, TN
How should parts be returned?
Chicago Training Center,
Hinsdale, IL
(630) 323-6000
Satellite locations:
WPC has established a contract with UPS to handle
returns. Where possible, use the container from the
replacement part. Drain fluids and wipe the part clean.
Include properly protected paperwork, according the the
Why does GM ask for parts to be returned to
the WPC?
Dakota County Tech,
Rosemount, MN
Analyzing returned parts will assist in improving
product quality, reducing customer dissatisfaction and
reducing warranty expense.
Sinclair Community
College, Dayton, OH
What happens to a part when it’s received by
the WPC?
Detroit Training Center,
Warren, MI
(810) 576-3308
Los Angeles Training
Center, Burbank, CA
(818) 558-1620
When parts arrive at the WPC, they are either
inspected on-site or shipped to a supplier for review.
Parts inspected at the WPC go through a structured
review process. A typical review meeting may include
GM release engineers, supplier quality representatives,
the supplier, service information writers, and Brand
Quality and TAC managers. They conduct analysis,
brainstorming and problem solving of issues. The root
cause analysis of each part is entered into the WPC
The result of the meeting is a report of the cause,
complaint and corrective action. From this, the group
develops a plan for design changes, manufacturing
process improvements and service manual/diagnostic
Satellite locations:
Portland Community
College, Portland, OR
What if I have questions regarding receipt of a
Los Positas,
Livermore, CA
Glendale Community
College, Glendale, AZ
Weber State, Ogden, UT
Training Solutions
Wheat Ridge, CO
The WPC Website has implemented a Dealer query
on its website. Dealers can query for an Open Status
report that lists open requests and their due dates or
query individual part requests. The Dealer’s Business
Associate Code (BAC) and a Request Number is necessary for an individual request. The website is
The website will also provide information regarding a
debit. Upon inserting a Request Number, the dealer will
receive an explanation of why a request was debited.
- Gary McAdam and Annie Chi contributed to this article.
– Jean Hart
Return to page 1
TAC Tips
2000 Cadillac Escalade
Rosen Entertainment
A special phone number has been
established for assistance with diagnosis of the Rosen entertainment
system on 2000 Cadillac Escalade
models. To contact Rosen Technical
Assistance, call
1-800-284-7677 from 8:00 am - 5:00
pm, Pacific time.
1999-00 Tracker
Automatic Light Control
Cannot Be Disabled
The Automatic Light Control (ALC)
system on 1999-2000 Chevy Tracker
two- and four-wheel-drive models will
turn the headlamps, taillamps, and
instrument panel lamps on when the
dash sensor (ambient light sensor) is
shadowed for 3-5 seconds or at
Dinghy Towing
Some Important Tips
Earlier this Spring you received Bulletin
00-00-89-008, which contains the latest
word on dinghy towing. Dinghy towing
refers to towing a vehicle with all four
wheels on the ground, for instance behind a
motor home.
Your customers may have questions
about which vehicles can be towed this
way, and how to do it correctly. Refer them
to the Owner’s Manual for guidance. Details
are also included in the bulletin mentioned
above. Be sure to read the bulletin completely and follow the procedures exactly, to
avoid damage to the vehicle being towed.
These are the highlights.
dusk. The ALC
system cannot be
disabled by setting the parking brake prior to ignition. With the engine running and the
headlamps off, lifting the parking
brake handle to the first click will turn
off the daytime running lamps (DRL)
and turn on the instrument panel
brake indicator light. The DRL's will
remain off and the instrument panel
brake indicator light will remain on
until the parking brake is released
2000 4.6L Engines Low Oil
Message Remains On
Some 2000 model year Cadillac
DeVille, Seville and Eldorado models
equipped with the 4.6L (LD8, L37) V8 engines may exhibit a condition
where the low oil message remains
on after an oil change or a previous
low oil condition.
If there is loose paper in the glove
box of a 2001 Oldsmobile Aurora, it’s
possible for the paper to be pulled
into the HVAC system when the system goes into the recirculation mode.
This may result in noise coming from
the HVAC system as well as blower
motor imbalance. Advise owners to
remove loose papers from the glove
box. Additional information about any
repair procedures will be provided
when available.
– GM Technical Assistance
NOTE: Refer to the service manual for
propeller shaft removal and installation.
Provisions must be made to keep the lubricant in the transmission and dirt out.
- Shift the transmission to Neutral. Then
release the parking brake.
- Place the automatic transmission in
PARK, or the manual transmission in first
- Do not exceed 65 mph while dinghytowing.
Light Duty Trucks with
4-Wheel or All-Wheel Drive
Certain T and K trucks may be dinghytowed with the transfer case shifted to
Neutral. These are listed in the Bulletin.
NOTE: Cars must not be towed
backward or the transmission may
be damaged.
If dinghy-towing, follow this procedure.
- Set the parking brake.
- After hooking the vehicle to the towing
vehicle, shift the transfer case to Neutral.
Be aware that the vehicle can roll, even if
the transmission is in Park or in gear.
- Release the parking brake.
- The steering column must be
unlocked. The Owner’s Manual specifies the
appropriate ignition key position to
ensure that the steering is
unlocked to allow the front
wheels to follow the tow vehicle.
Light Duty Trucks
with Rear Wheel
The bulletin spells out exactly
which vehicles may be towed.
Generally, they are those with front
wheel drive and either the 4T40-E
or 4T45-E automatic transaxle or
the MK7 or MJ1 5-speed manual
- First, set the parking brake.
- After hooking the vehicle to the towing
Noise From the Aurora
HVAC System
vehicle, the steering column must be
unlocked. The Owner’s Manual specifies the
appropriate ignition key position to ensure
that the steering is unlocked to allow the
front wheels to follow the tow vehicle, and
to ensure that the transmission shifter is
unlocked, without starting the engine.
Passenger Cars
- Because the ignition key must be
turned from the LOCK position, it’s necessary to pull the fuse(s) indicated in the
Owner’s Manual. This prevents the instrument panel or electronic PRNDL from draining the battery.
If all published diagnosis has been
performed and the condition still
exists, it may be caused by a PCM
software calibration. An updated
PCM calibration was released on
Techline 2000 data CD #4 (released
to the field on March 2, 2000) to correct for the low oil message condition.
The remaining T and K trucks with 4wheel- or all-wheel-drive can be dinghytowed only with the propeller shafts
removed. For these trucks, the preferred
towing method requires use of a platform
trailer which lifts all four wheels from the
These vehicles should not be
dinghy-towed. The preferred towing method requires use of a platform trailer which lifts all four
wheels from the pavement. If
towing on all four wheels is unavoidable,
the propeller shaft must be removed and
the steering column unlocked.
NOTE: Refer to the service manual for
propeller shaft removal and installation.
Provisions must be made to keep the lubricant in the transmission and dirt out.
Return to page 1
Bulletins –
June 2000
This review of service bulletins released
through mid-June lists the bulletin number,
superseded bulletin number (if applicable)
subject and models.
00-00-89-011; April, 2000 Bulletin
Summary; 2001 and Prior Passenger Cars
and Trucks
00-00-89-012; June, 2000 Labor Time
Guide Updates; 1996-2001 Passenger Cars
and Trucks
00-01-38-005; A/C Condenser Instability,
A/C System Inoperative (Inspect A/C System
and Install Washers or Replace Condenser);
1997-2000 Chevrolet and GMC F Model TSeries Tilt Cab Medium Duty Trucks With Air
Conditioning (RPO C60)
00-02-35-004; Steering or Front End
Road Induced Vibration (Install and Reinforce
Revised Steering and Suspension
Components); 1999-2000 Chevrolet and
GMC C1500 Pickup Trucks (Silverado and
Sierra) Built Prior to VIN Breakpoints
00-05-22-004; Brake Fluid Level and
Filling Recommendations; 2001 and Prior
Passenger Cars and Trucks
00-05-23-003; Front Disc Brake Squeal
(Install New Front Disc Brake Pads); 2000
Chevrolet and GMC G30 Vans, Built Prior to
May 2, 2000
99-06-04-057A; Replaces 99-06-04-057;
Body Control Module (BCM) Related Service,
Theft Deterrent Re-Learn Procedure; 2000
Chevrolet Impala, Monte Carlo
TechLink on the Web
In response to reader comments,
we announced in May that we’re considering a permanent TechLink Web
site. Before that can happen, we need
your input.
You can do that in one of two
ways. First, there is this simple, 5question survey. You can fill it out and
fax it to 1-248-649-5465. Or, better
yet, take a look at the sample Web
site at and fill
out the survey while you’re there.
The Web site will only be up and
running for a short time. And we’ll be
tabulating the results by the end of
July, so please get your survey sent in
by then. Thanks for taking the time to
let us know what you think.
00-06-01-003; Release
of New Exhaust
Heat Shield; 1998-2000
Chevrolet and GMC C6-7 Series
Conventional Medium Duty Trucks With
3126 CAT® 275 and 300 hp Diesel Engine
00-06-01-012; Replaces 87-61-24; Use of
"Surface Conditioning Discs;" 2000 and Prior
Passenger Cars and Trucks
00-06-02-004; Brown Colored Gel-Like
Substance on Radiator Cap and Upper Filler
Neck (Replace Radiator Cap and Clean
Radiator Upper Filler Neck); 1997-2000 Buick
Century, 1996 Chevrolet Lumina APV, 19962000 Chevrolet Lumina, Monte Carlo, 19972000 Chevrolet Venture, 2000 Chevrolet
Impala, 1996-97 Oldsmobile Cutlass
Supreme, 1996-2000 Oldsmobile Silhouette,
1996-97 Pontiac Trans Sport, 1996-2000
Pontiac Grand Prix, 1998-2000 Pontiac
Montana, With 3.1L or 3.4L Engine (VINs J,
M, E, X - RPOs LG8, L82, LA1, LQ1)
00-06-03-003; Supplements but does not
replace 99-06-03-012; Battery Testing and
Replacement; 1997-2001 Passenger Cars
and Trucks (Except 2001 Chevrolet Corvette)
00-06-04-007A; Replaces 00-06-04-007;
Increased Accelerator Pedal Effort (Replace
Throttle Body); 1999-2000 Chevrolet and
GMC C/K Pickup Models (Silverado and
Sierra), with 4.8L, 5.3L or 6.0L V8 Engine
(VINs V, T, U - RPOs LR4, LM7, LQ4)
00-06-04-021; Proper Service of Quick
Connect EVAP System Connectors; 19852001 Passenger Cars and Trucks
00-06-05-002; Exhaust Boom at 1500
RPM (Install Spacers to Exhaust Hanger);
2000 Chevrolet Corvette Built from SOP
through December, 1999
00-07-30-006; Replaces 87-71-63;
Stalls/Surges at Stop or When Shifted to
Drive or Reverse (Install Updated
Calibration); 1998-2000 Chevrolet and GMC
C/K Models and G Vans, With Hydra-Matic
Fill out this questionnaire online at or
copy this page and fax it to 1-248649-5465.
1. What is your job?
❑ A. Technician
4L80E Transmission (RPO MT1)
00-07-30-007; Whine Noise in Park or
Neutral, Service Engine Soon or Service
Vehicle Soon Lamp Illuminates (Replace
Drive Sprocket Support Bearing); 1999-2000
Buick LeSabre, Park Avenue/Ultra, Regal,
Riviera, 1999-2000 Chevrolet Lumina, Monte
Carlo, Venture, 1999 Oldsmobile Eighty
Eight, 1999-2000 Oldsmobile Intrigue,
Silhouette, 1999-2000 Pontiac Bonneville,
Grand Prix, Montana, With 3.4L or 3.8L
Engine (VINs E, H, K, 1 - RPOs LA1, LX5,
L36, L67) and Hydra-Matic 4T65-E
Transaxle/Transmission (RPOs MN3, MN7,
00-07-30-009; Current Model Year
Goodwrench Transmission Replacement
Assembly; 1998-2000 Passenger Cars and
Light Duty Trucks with 4L30E, 4L60E,
4L80E, 3T40, 4T40E, 4T45E, 4T60E, 4T65E
or 4T80E Automatic Transmission
00-07-30-011; Replaces 72-05-02;
ACDelco® Remanufactured Transmissions;
1996 and Prior Passenger Cars and Trucks
99-08-42-007A; Replaces 99-08-42-007;
Daytime Running Lamps (DRL) Disable
Procedure; 2000 Chevrolet and GMC C/K
Pickup (Silverado and Sierra), M/L, S/T
Models, 2000 Oldsmobile Bravda, Built After
VIN Breakpoints
00-08-49-003; Rattle/Squeak in Right
Side of Instrument Panel or Right Front Door
Trim Panel Scratched or Right Side End of
Instrument Panel Contacting Door Trim Panel
(Remove Instrument Panel Assembly and
Align Tie Bar); 1995-2000 Chevrolet Cavalier
and Pontiac Sunfire
00-08-63-003; Noise at Torsion Bar
Location, Cab Difficult to Open, Torsion Bar
Broken (Inspect/Replace Cab Pivot Torsion
Bar); 1997-98 Chevrolet and GMC F Model TSeries Medium Duty Tilt Cab Trucks
00-08-110-002; Removing Adhesive
Residue from Interior Door Trim Panels; 2000
Chevrolet Impala, Monte Carlo
3. Would you like to see GM
TechLink available on the
❑ A. Yes
❑ B. No
❑ C. Service Manager
4. If GM TechLink were available
on the Internet, where would
you most likely access it
❑ D. Other
❑ A. Dealership
❑ B. Service Consultant
2. Which of the following best
describes your business?
❑ A. Retail Dealership
❑ B. Fleet
❑ C. Other Service Facility
❑ D. GM Wholesale Organization
❑ B. Home
❑ C. Both
5. Would you like to see GM
TechLink expanded to cover
mor e service issues?
❑ A. Yes
❑ B. No
Return to page 1
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