Table of Contents
Advertisement
1-28 Heating, Ventilation and Air Conditioning
HVAC
Repair Instructions
Odor Correction
Eliminating Air Conditioning Odor
Odors may be emitted from the air conditioning
system primarily at start up in hot, humid climates.
The following conditions may cause the odor:
" Debris is present in the heating, ventilation and air
conditioning (HVAC) module.
" Microbi.al growth on the evaporator core.
When the blower motor fan is turned on, the microbial
growth may release an unpleasant musty odor into
the passenger compartment.
A service kit that can correct the condition is available
through General Motors Service Parts
Operation (GMSPO) to address this condition.
To remove odors of this type, it is necessary to
eliminate the mirocbial growth and prevent its
recurrence. To accomplish this, these two procedures
must .be completed.
• Deodorize the evaporator core using Deodorizing
Aerosol Kit P/N 12377951
.. Install the new air conditioning (A/C) Delayed
Blower Control Package, P/N 12370470
The blower control package will enable the blower to
run at high speed for 5 minutes. It will do so
approximately 50 minutes after the ignition has been
turned off it the compressor had been engaged for 4 or
more minutes prior to shutting off the engine. By
doing so, the evaporator case and core are dried out,
reducing the chances of a recurring A/C odor.
Perform the following steps in order to deodorize the
A/C system:
1. Ensure that the plenum that draws outside air into
the HV AC module is clear of all debris.
2. Disable the A/C compressor clutch operation by
disconnecting the clutch coil electrical connector.
3. Dry the evaporator core by performing the
following steps:
3.1. Start the vehicle.
3.2. Set the temperature control on
maximum heat.
3.3. Set the control to the MAX setting.
3.4. Run the blower motor on high for
10 minutes.
4. Locate an area in the air conditioning duct
between the blower motor and the evaporator core
downstream of the blower motor.
5. Drill a 3.175 mm (0.125 in) hole where it will not
interfere with, or damage the following
components:
" The blower motor
• The evaporator core
" Any other operating part the of system
6. Wear safety goggles and latex gloves in order to
perform the following actions:
6.1. Continue to operate the blower motor
on high.
6.2. Insert the extension tube of the deodorizer
GM P/N 12377951 into the hole, past the
mark on the extension tube.
6.3. Use short spray bursts and vary the
(
direction of spray for a 2-3 minute period
of time, in order to dispense the contents of
the can into the duct.
7. Shut the engine OFF. Allow the vehicle to s~ for
3-5 minutes.
8. Seal the 3.175 mm (0.125 in) hole with body
sealer or RTV gasket compound.
9. Start the engine.
10. Operate the blower motor on high for
15-20 minutes to dry.
11. Reconnect the A/C compressor clutch coil
electrical connector.
12. Verify proper clutch operation.
Refrigerant Recovery and Recharging
Tools Required
0
J 39500-B AIC Refrigerant Recovery, Recycling
and Recharging (ACR4) System
O
J 41810 PureGuard 2
" J-41810-100A Active Flow Control Valve
Caution: Refer to Caution - Breathing R-134a in
Cautions and Notices.
Caution: For personal protection, goggles and
gloves should be worn and a clean cloth wrapped
around fittings, valves, and.connections when
doing work that includes opening the refrigerant
(
system. If R-134a comes in contact with any part of
.
the body severe frostbite and personal injury
can result. The exposed area should be flushed
immediately with cold water and prompt medical
help should be obtained.
Notice: R-i 34a is the only approved refrigerant for use
in this vehicle. The use of any other refrigerant may
result in poor system performance or component failure.
Notice: To avoid system damage use only R-134a
dedicated tools when servicing the A/C system.
Notice: Use only Polyalkylene Glycol Synthetic
Refrigerant Oil (PAG) for internal circulation through the
R-134a A/C system and only 525 viscosity mineral oil
on fitting threads and 0-rings. If lubricants other than
those specified are used, compressor failure and/or
fitting seizure may result.
Notice: R-12 refrigerant and R-134a refrigerant must
never be mixed, even in the smallest of amounts, as
they are incompatiblE:l with each other. If the refrigerants
are mixed, compressor failure is likely to occur. Referto
the manufacturer instructions included with the service
equipment before servicing.
The J 39500-8 removes the Refrigerant-134a from the
vehicle's A/C system. The recovery procedure uses
one filtering cycle. The evacuation procedure uses an
automatic multiple pass filtering cycle. These
filtering cycles ensure a constant supply of clean, dry
refrigerant for A/C system charging.
The Initial Set-Up Instruction Manual, provided with
the J 39500-B, contains specific procedures for proper
recovery, evacuation and recharging.
For ACR4 technical assistance in the U.S., call
1-800-345-2233.
(
Advertisement
Chapters
Table of Contents
