03-01-39-012A

Bulletin No.:
Service Bulletin
Date:
03-01-39-012A
March, 2023
TECHNICAL
Subject:
Odor from A/C At Vehicle Start-Up (Remove Debris from Evaporator Case, Apply
Cooling Coil Coating, and Activate or Install Delayed Blower Motor Control Module)
Models:
2001–2004 Saturn L-Series vehicles with standard HVAC (RPO C60)
2002–2003 Saturn L-Series vehicles with Automatic Climate Control (RPO C68)
This bulletin is being revised to update the Service Procedure. This bulletin supersedes
bulletin 03-01-39-012, which should be discarded.
Attention:General Manager, Fixed Operations
Manager, Parts Manager, Technician
Condition:
Some customers may comment on a musty odor from
A/C system that may be most noticeable at vehicle
start-up.
Cause:
An unpleasant (musty) odor from A/C outlets at vehicle
start-up may be the result of microbial growth on the
evaporator core.
Correction:
Remove any debris from the evaporator case, clean
evaporator with disinfectant. For vehicles with standard
HVAC (RPO C60), install delayed blower motor control
module according to the appropriate procedure in this
bulletin. For vehicles with automatic climate control
(RPO C68), activate delayed blower motor control
according to the appropriate procedure in this bulletin.
Service Procedure
Important: Before performing the procedures in this
bulletin, inspect, clean, and/or replace the passenger
compartment air filter to ensure odor is not caused by
debris in the filter. Refer to the appropriate section in
the HVAC Service Manual for Removal and Installation
procedures as needed.
Important: Before installing the delayed blower motor
control module (for manual HVAC systems, RPO C60)
or activating the delayed blower motor control (for
automatic climate control systems, RPO C68), the
following information MUST BE EXPLAINED TO
CUSTOMER.
Copyright 2023 General Motors LLC. All Rights Reserved.
CUSTOMER INFORMATION
• The delayed blower motor control module will not
affect normal A/C or blower motor operation.
However, the delayed blower motor control
module will activate the blower motor on high
speed for approximately five minutes, if the A/C
clutch has been continuously activated for 4
minutes or more. The delayed blower motor
control module will wait approximately 50 minutes
after the ignition is turned OFF before activating
the blower motor.
The blower run time reduces the amount of
condensate on the evaporator core that my
contribute to undesirable odors. The blower motor
will be turned ON with no driver input when the
ignition is turned off and the conditions as stated
above are met. The air rush sound created by the
blower motor is noticeable from outside the
vehicle.
• The minimal current draw of the delayed blower
motor control module, combined with the blower
motor load, will lower the state of charge of the
vehicle's battery, and may negatively impact
battery life depending on the driving habits of the
customer.
Cleaning and Cooling Coil Coating
Application Procedure (for both C60
and C68 HVAC systems)
Before starting the following procedure, obtain the
following equipment and supplies:
• A/C System Cooling Coil Coating (P/N 12346390;
P/N 10953503 in Canada)
• Cleaning Gun, OTC Tool SA9216NE
Caution: WHEN APPLYING COOLING COIL
COATING (P/N 12346390; P/N 10953503 in Canada),
ORDINARY SAFETY GLASSES ARE NOT
SUFFICIENT.
• Safety goggles
Page 2
March, 2023
•
When applying cooling coil coating (P/N
12346390; P/N 10953503 in Canada), National
Institute of Occupational Safety and Health
(NIOSH) approved acid gas/organic vapor
respirator with chlorine dioxide cartridges (3M® P/
N 5103–small, 5203–medium, 5303–large), which
are to be used with a pre-filter (P/N 5010) and
retainer (P/N 501), or equivalents.
• Rubber gloves
• Pedestal fan
1. Dry evaporator:
1.1. Adjust HVAC controls to hottest temperature
setting.
• For models with manual HVAC (RPO C60),
adjust temperature to full hot (highest
setting). Set mode to heater only, turn
RECIRC on, and make sure A/C button
is off.
• For models with automatic climate control
(RPO C68), adjust temperature to 32°C
(90°F) in AUTO mode.
1.2. Set fan control to highest setting (for models
with manual HVAC, RPO C60), or AUTO (for
models with automatic climate control,
RPO C68).
1.3. Close all windows and doors.
1.4. Start engine and allow to reach operating
temperature.
1.5. When engine reaches operating temperature,
set blower motor to HI for 5 minutes.
Caution: MAKE SURE VEHICLE IS PROPERLY
SUPPORTED AND SQUARELY POSITIONED ON
HOIST. TO HELP AVOID PERSONAL INJURY,
PROVIDE ADDITIONAL SUPPORT TO OPPOSITE
END OF VEHICLE THAT COMPONENTS ARE
REMOVED FROM.
2. Raise vehicle on hoist. Refer to “Lifting, Jacking,
and Support Points” in the appropriate model year
Saturn L-Series Chassis Service Manual.
Bulletin No.: 03-01-39-012A
3. Check the HVAC module drain for blockage. If
necessary, clear drain hole with a soft blunt tool
such as the eraser end of a pencil.
4. Lower vehicle from hoist.
5. Place a drain pan directly below the HVAC drain to
collect disinfectant or cooling coil coating and rinse
water runoff.
6. Open all doors and windows in the vehicle.
7. Position pedestal fan so that it provides cross
ventilation through the vehicle during the cleaning/
coating procedure.
8. Cover interior of vehicle with suitable protective
coverings to protect surfaces from overspray.
Caution: THE FOLLOWING PROCEDURE SHOULD
ONLY BE PERFORMED ON A COLD VEHICLE. IT
HAS BEEN DEMONSTRATED THAT IRRITATING
VAPORS WILL BE FORMED IN THE ENGINE
COMPARTMENT IF THE COOLING COIL COATING
COMING OUT OF THE DRAIN OUTLET CONTACTS
HOT ENGINE COMPONENTS.
COOLING COIL COATING CAN CAUSE
SUBSTANTIAL, BUT TEMPORARY EYE INJURY. DO
NOT GET COOLING COIL COATING IN EYES OR ON
CLOTHING. WASH THOROUGHLY WITH SOAP AND
WATER AFTER HANDLING.
FIRST AID: IF COOLING COIL COATING GETS INTO
EYES, HOLD EYELIDS OPEN AND FLUSH WITH A
STEADY, GENTLE STREAM OF WATER FOR 15
MINUTES. OBTAIN MEDICAL ATTENTION IF
IRRITATION PERSISTS.
9. Allow vehicle to cool down before performing
cooling coil coating procedure.
894220
10. Remove right side console extension.
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Bulletin No.: 03-01-39-012A
March, 2023
896491
Important: Steps 11–13 should be skipped if vehicle
does not have the I/P lower dash insulator.
11. Remove right side I/P lower dash insulator
retainers.
12. Pull insulator rearward to detach from forward
insulator support.
13. Remove insulator support from front of dash studs
by pulling rearward.
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894362
15. Locate evaporator access door location on the
right side of the module.
Notice: TO AVOID CUTTING INTERNAL
COMPONENTS, CUT ONLY INSIDE THE RAISED
BEAD AREA. Do not cut through or damage raised
bead. This bead will be used as a sealing surface when
completing procedure.
894353
897891
14. Remove right side heater duct assembly retainer
and remove duct.
16. Using a sharp utility knife, cut through module wall,
following inside of raised bead as a guide. The
entire area inside the raised lip needs to be cut out.
Several passes may be necessary to do this.
Notice: Use care when cleaning and removing debris
around the evaporator to avoid damage to the fins.
17. Carefully clean out any moisture or debris that may
be inside the module.
18. Put on rubber gloves, safety goggles, and NIOSH
approved acid gas/organic vapor respirator.
Page 4
March, 2023
19. Using cleaning gun, OTC Tool SA9216NE (or
equivalent siphon-type parts cleaning spray gun
capable of delivering 60 ml (2 ounces) per minute
of liquid with shop air at 552–620 kPa [80–90 psi]),
insert siphon hose into container of cooling coil
coating. Take care to place the bottle in a secure
upright position to avoid spilling contents.
20. Regulate shop air to 276–414 kPa (40–60 psi).
Bulletin No.: 03-01-39-012A
Notice: Proper sealing is important to prevent
condensation from leaking into passenger
compartment.
23. Apply provided sealant in kit to service door at
tongue and groove location as shown.
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1244556
21. Insert nozzle tip of spray gun so spray pattern will
be parallel to the evaporator face.
22. Apply cooling coil coating using short bursts and
rotating the nozzle tip up and down. This will allow
for an even distribution and to ensure full coverage
of the evaporator.
24. Install evaporator core service door (P/N
22679783) to module and install screws.
Tighten
Tighten the Evaporator Core Service
Door-to-HVAC Module Fasteners to 1 Y
(9 in-lbs).
897891
894363
25. Install right side heater duct assembly and retainer.
26. Install insulator support to front-of-dash studs by
sliding forward.
Bulletin No.: 03-01-39-012A
March, 2023
Important: Step 27 should be skipped if vehicle does
not have the I/P lower dash insulator.
896491
27. Install right side I/P lower dash insulator and
retainers.
Page 5
30. Dry evaporator:
30.1. Adjust HVAC controls to hottest temperature
setting.
• For models with manual HVAC (RPO
C60), adjust temperature to full hot
(highest setting). Set mode to heater only,
turn RECIRC on, and make sure A/C
button is off.
• For models with automatic climate control
(RPO C68), adjust temperature to 32°C
(90°F) in AUTO mode.
30.2. Set fan control to highest setting (for models
with manual HVAC, RPO C60), or AUTO (for
models with automatic climate control,
RPO C68).
30.3. Close doors and open windows
12.7 mm (0.5 in).
30.4. Start engine and allow to reach operating
temperature.
30.5. When engine reaches operating
temperature, allow blower motor to operate
on HI blower for 5 minutes.
31. Properly dispose of cooling coil coating runoff
collected in drain pan into approved container.
32. Remove protective coverings from interior of
vehicle.
33. Remove pedestal fan from area.
Wire Splicing — General Information
(for both C60 and C68 HVAC systems)
With the wiring used in the Saturn vehicles, it is
recommended that approved Packard Electric Crimp
and Seal Splice Sleeves (or equivalent) be used. The
information in this section applies to wire splicing
performed in the subsequent sections for both Delayed
Blower Kit Installation (manual HVAC, RPO C60) and
Delayed Blower Motor Control Activation (automatic
climate control, RPO C68) procedures.
1. Remove insulation from both ends. Recommended
strip length is 9.5 mm (3/8 in.). Caution must be
used to prevent cutting the wire strands. Locate
new splice a minimum of 40 mm (1.5 in.) from an
outlet or other splice.
2. Determine proper sleeve for gauge of wire. See
table below.
894220
28. Install right side console extension.
29. Allow evaporator core to soak for 15 minutes.
Page 6
March, 2023
1283472
* Order through Packard at 1–800–PACKARD (1–
800–722–5273).
** Order through Saturn Special Tool Catalog.
Included with Terminal Repair Kit (SA9138Z).
Important: When using the salmon splice sleeve with
.35 mm (22 gauge) wire, remove 19 mm (3/4 in.) of
insulation. Bend the stripped portion in half to double
the thickness of the wire going into the splice sleeve.
Twist the stripped, doubled wire and insert into the
splice sleeve.
Important: When splicing three wire ends into one
splice sleeve, insert one cut wire end from vehicle
harness and new splice wire end into one side of the
splice sleeve until wires hit stop. Hand crimp using
approved crimping tool. Insert remaining cut wire end
from vehicle harness into other side of splice sleeve
and crimp.
3. Position stripped ends in sleeve until wires hit the
stop in the center of the splice.
Bulletin No.: 03-01-39-012A
880456
4. Hand crimp sleeve using the approved crimping
tool. Gently tug on wires to make sure they are
secure before applying heat to them.
5. Check for continuity in the wire.
880444
Caution: Do not use a match or open flame to apply
heat to splice sleeve.
6. Apply heat using Ultratorch (or equivalent), heating
splice sleeve to 175° C (347° F). Heat until glue
flows around edges of splice sleeve.
Bulletin No.: 03-01-39-012A
March, 2023
Page 7
Delayed Blower Kit Installation and
Testing Procedure (for C60 manual
HVAC systems only)
Important: This procedure is for vehicles equipped
with manual HVAC systems (RPO C60) only. If vehicle
is equipped with automatic climate control (RPO C68),
go to “Delayed Blower Motor Control Activation” section
in this bulletin.
Before starting the following procedure, obtain the
following parts:
• 3 Wire Splice Connector, P/N 22709318
• Delayed Blower Control Module Kit, P/N
22679784
• Relay Kit, P/N 22688666
• Splice Sleeves — Salmon, P/N 12089189 (need 5
sleeves)
• Splice Sleeves — Yellow, P/N 12089191 (need 5
sleeves)
• Splice Sleeves — Blue, P/N 12089190
Installing the Delayed Blower Motor Control Module
For the following procedure, refer to the wiring diagram
on pages 10 — 11.
1244591
1. Record all pre-set radio stations.
2. Turn off all lamps and accessories.
3. Turn ignition OFF.
4. Disconnect the negative battery cable.
Caution: When performing service on or around SIR
components or SIR wiring, follow the cautions and
procedures in the SIR Service Manual to temporarily
disable the SIR System. Failure to follow the disable
procedures could result in possible airbag deployment,
personal injury or otherwise unneeded SIR System
repairs.
5. Disable the SIR. Refer to “SIR Disable/Enable
Procedure” in the appropriate model year Saturn
L-Series Restraints Service Manual.
6. Remove the left front kick panel.
7. Remove the left front I/P fuse block.
8. Disconnect gray 68–way connector.
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889903
9. Locate RED 5.0 mm (10 gauge) wire (circuit 502)
at pin A11 and cut 76 mm (3 inches) from
connector.
10. Using two of the wires in the splice connector, butt
connect the two cut ends of the RED 5.0 mm (10
gauge) (circuit 502) to the splice connector using
yellow splice sleeves.
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March, 2023
11. Reconnect gray 68–way connector.
12. Route 3rd wire in splice pack connector toward
center of the console under the dash.
13. Remove radio bezel and radio.
14. Route relay (P/N 22688666) wire located at pin 87
at the relay through radio opening toward LIPFB.
15. Butt connect wire from pin 87 at the relay to the 3rd
wire from the splice connector routed from the
LIPFB using a yellow splice sleeve.
16. Remove left side console extension.
17. Install after blow module (P/N 22679784) under the
HVAC module.
18. Locate WHT wire (pin E) at the after blow module
pig tail.
18.1. Route WHT wire (pin E) through the front of
dash pass through for the I/P harness to the
underhood junction fuse block.
18.2. Remove top of junction block to gain access
to the wires in the black 68-way connector.
18.3. Route WHT wire (pin E) into lower cavity of
the UHFB.
18.4. Locate circuit 459 at pin C4 in the black 68–
way connector at the UHFB.
18.5. Splice WHT wire into circuit 459 a few
inches from the 68–way connector using a
salmon splice sleeve.
18.6. Install top of junction block into base.
18.7. Using electrical tape or wire ties, secure
white wire to the wiring harness.
19. Route remaining wires from the after blow module
up into the radio cavity in the I/P.
20. Butt connect the BLK/ORN wire (pin G) from the
after blow module to the relay wire from pin 85
using a salmon splice sleeve.
21. Make the following splices at the Radio gray 24–
way connector.
21.1. Splice the ORN wire from pin A at the after
blow module into ORN .5 mm (20 gauge)
wire (circuit 440) in cavity B1 using a salmon
splice sleeve.
21.2. For 2001–2003 model year vehicles: splice
the RED wire from pin B at the after blow
module into YEL .35 mm (22 gauge) wire
(circuit 43) in cavity B2, using a salmon
splice sleeve.
For 2004 model year vehicles: splice the
RED wire from pin B at the after blow
module into YEL .35 mm (22 gauge) wire
(circuit 43) in cavity B11 using a salmon
splice sleeve.
21.3. Splice the BLK/WHT wire from pin C at the
after blow module into BLK 1.0 mm (16
gauge) wire (circuit 550, ground) in cavity
A12 using a blue splice sleeve.
21.4. Splice the wire from pin 86 at the relay into
the BLK 1.0 mm (16 gauge) wire (circuit 550,
ground) in cavity A12 using a blue splice
sleeve.
Bulletin No.: 03-01-39-012A
22. For 2001–2003 model year vehicles, cut ORN
3.0 mm (12 gauge) wire (circuit 52) about 45 mm
(2 inches) from the HVAC/IP inline connector.
Circuit 52 loops between pins A and B at the
HVAC/IP inline connector.
23. Butt connect the wire from pin 87a at the relay to
the section of ORN 3.0 mm (12 gauge) wire (circuit
52) that goes to pin A at the HVAC/IP inline
connector using a yellow splice sleeve.
24. Butt connect the wire from pin 30 at the relay to the
section of ORN 3.0 mm (12 gauge) wire (circuit 52)
that goes to pin B at the HVAC/IP inline connector
using a yellow splice sleeve.
25. Using a tie strap, secure the relay to the upper left
side of the H-brace, allowing enough room to
reinstall the radio bezel.
26. Using the hook and loop material provided on the
after blow module, secure the module to the
underside of the HVAC module and reinstall the
closeout panel.
27. Connect negative battery cable.
28. Proceed to “Testing the Delayed Blower Motor
Control Module” and verify operation. After
operation is verified, proceed to next step.
Important: Do not install parts that have been
removed until correct operation of the delayed blower
module has been verified.
29. Disconnect negative battery cable.
30. Connect electrical connections and install radio.
31. Install radio bezel.
32. Install left console extension assembly.
33. Install left I/P fuse block.
34. Install left front kick panel.
35. Enable SIR system. Refer to “SIR Disable/Enable
Procedure” in the appropriate model year Saturn
L-Series Restraints Service Manual.
36. Connect negative battery cable.
Tighten
Tighten the Battery Terminal Bolts to17 Y
(13 ft-lbs).
37. Set radio station presets and set clock to current
local time.
38. Clear any SIR diagnostic trouble codes that may
have set during delayed blower motor control
module testing. Refer to the appropriate model
year Saturn L-Series Restraints Service Manual.
Bulletin No.: 03-01-39-012A
March, 2023
Testing the Delayed Blower Motor Control Module
A full functional check of the delayed blower motor
control module is required to assure that all electrical
connections are connected properly, and it is
functioning as designed.
1. Locate the GRN wire at cavity H of the delayed
blower motor control module and insert a
metri-pack 280 series male test adapter into cavity
H until contact is made with GRN wire terminal in
the delayed blower motor control module pigtail
connector.
Important: Do not disconnect the jumper harness
connector from the delayed blower motor control
module pigtail connector or system test will not
function.
2. Start engine and turn On A/C and verify that
compressor clutch engages. With clutch engaged,
apply battery voltage to the test adapter install in
step 1 above.
3. After 30 seconds, turn the ignition Off with voltage
still applied to the test adapter. Approximately 10
seconds after the ignition is turned Off, the blower
motor will run for one second if the delayed blower
motor control module is wired correctly.
4. Disconnect voltage to the test adapter and remove
adapter from connector.
5. If the delayed blower motor control module runs for
one second, go back to installation procedures and
install parts removed from vehicle. If the delayed
blower motor control module does not run for one
second, go back to installation procedures and
check all wiring connections. Refer to “Delayed
Blower Motor Control Module Diagnosis” in this
bulletin if functional check is not passed.
Delayed Blower Motor Control Module Diagnosis
VEHICLE RUNNING, HIGH BLOWER SETTING DOES
NOT OPERATE
Cause
The afterblow relay wires to
the LIPFB and Blower motor
are not properly connected.
Solution
•
Verify that the relay wire
at pin 87a on the relay is
connected to the YEL
wire (circuit 268) from the
LIPFB, pin C12 on the
GRA 68–way connector.
•
Verify that the relay wire
at pin 30 on the relay is
connected to the YEL
wire (circuit 268) going to
the blower motor pin B.
BLOWER DOES NOT OPERATE AFTER SPECIFIED
DELAY TIME (MAKE SURE THAT ALL WIRES TO
MODULE ARE PROPERLY CONNECTED. USE A
VOLTMETER TO CHECK THAT THE PROPER
SIGNAL IS APPLIED TO EACH WIRE.)
Page 9
Cause
Solution
(Test Mode Only) GRN test
wire from delayed blower
motor control module is not
properly connected to
vehicle battery source.
Connect or jumper GRN test
wire (pin H) to the vehicle's
battery (not ignition).
Proper signal not received
from A/C compressor.
Make sure A/C compressor
is connected electrically.
Secondly, use a voltmeter to
verify that A/C compressor
low signal is zero volts when
air conditioning is turned On.
A/C compressor was not in
operation long enough to
trigger delayed blower motor
control module.
Start engine and turn On A/
C. Make sure A/C
compressor clutch is
continuously engaged for at
least four minutes to trigger
delayed blower motor
control module.
For test mode, run A/C for
30 seconds before turning
Off engine.
Delayed Blower Motor Control
Activation Procedure (for C68
automatic climate control
systems only)
Important: This procedure is for vehicles equipped
with automatic climate control systems (RPO C68)
only. If vehicle is equipped with a manual HVAC system
(RPO C60), go to “Delayed Blower Kit Installation”
section in this bulletin.
Before starting the following procedure, obtain the
following parts:
• 3 Wire Splice Connector, P/N 22709318
• Splice Sleeves — Yellow, P/N 12089191 (need 3
sleeves)
Caution: When performing service on or around SIR
components or SIR wiring, follow the cautions and
procedures in the SIR Service Manual to temporarily
disable the SIR System. Failure to follow the disable
procedures could result in possible airbag deployment,
personal injury or otherwise unneeded SIR System
repairs.
1. Disable SIR system. Refer to "SIR Disable/Enable"
procedure in the appropriate model year Saturn
L-Series Restraints Service Manual.
2. Record radio presets stations and disconnect
negative battery cable.
3. Remove lower left garnish molding covering the
Lower Instrument Panel Fuse Block (LIPFB).
4. Remove nuts holding the fuse block in place. (One
nut towards front of vehicle, one rearward.)
5. Remove the gray 68-way IP connector at the
LIPFB.
Important: For steps 6–10 refer to electrical
schematic.
6. Locate Circuit 268, in cavity C12 (yellow 3.0 mm
wire), in the gray 68-way connector.
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March, 2023
862384
7. Remove Circuit 268 from cavity C12 in the
connector:
7.1. Remove the terminal position assurance
(TPA) retainer.
7.2. Insert the terminal lock release tool into the
front of the connector cavity. Pull wires and
terminal out of the back of the connector.
7.3. Reinstall the TPA.
8. Cut the terminal end off circuit 268 and discard.
9. Locate circuit 502, in cavity A11 (red 3.0 mm wire),
in the gray 68–way IP connector.
10. Cut circuit 502 about 51 mm (2 in.) from the
connector.
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Bulletin No.: 03-01-39-012A
Important: For step 11, refer to electrical schematic on
previous page.
11. For information on splicing wires, refer to "Wiring
Splicing" instructions in this bulletin.
Using the 3–wire splice connector (P/N 22709318),
splice the three cut ends of circuits 268 and 502 to
the three wires in the connector, using the yellow
splice sleeves.
12. Reinstall the gray 68–way IP connector to the
LIPFB.
13. Using a tie strap, secure the splice connector to
the IP harness out of the way of the LIPFB.
14. Reinstall the LIPFB to the mounting studs (1
forward, 1 rearward).
15. Install nuts.
16. Install lower left garnish molding.
17. Enable SIR system. Refer to "SIR Disable/Enable"
procedure in the appropriate model year Saturn
L-Series Restraints Service Manual.
18. Connect negative battery cable.
Tighten
Tighten the Battery Terminal Bolts to
17 Y(13 ft-lbs).
19. Set radio station presets.
Parts Information
Part Number
Description
Qty
12346390
10953503 in
Canada
Coating — A/C Evap Organic
Matl Growth Prev
1
22679783
Evaporator Service Door
1
22709318
3 Wire Splice Connector
1
22679784
Delayed Blower Control
Module Kit
1
(C60 only)
22688666
Relay Kit
1
(C60 only)
12089189
Splice Sleeves — Salmon
5
(C60 only)
12089191
Splice Sleeves — Yellow
5 (for C60)
3 (for C68)
12089190
Splice Sleeves — Blue
1
(C60 only)
Bulletin No.: 03-01-39-012A
March, 2023
Page 11
Claim Information
To receive credit for this repair during the warranty
coverage period, submit a claim through the Saturn
Dealer System as follows:
Labor
Operation
Description
Labor
Time
D3316
Install Delayed Blower Motor
Control Module
1.7 hrs
D3319
Core, Evaporator — Clean and
Disinfect
1.4 hrs
Important: When it is necessary to clean and disinfect
the HVAC system at the same time the delayed blower
control module package is installed, submit labor
operation D3319 as a “related line” to failed labor
operation D3316.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
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 your GM dealer for information on whether your vehicle may benefit from the
information.
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