GMC Chevrolet Camaro 1998 Service Manual page 148

1-38 HVAC System - Manual HVAC
Odor Diagnosis
Problem Possible Cause Correction
• Locate and repair any water leaks.
• Water leaks (body} Refer to the appropriate repair
Musty Smell
• The evaporator drain is blocked.
procedure in Water Leaks. ·
• There is mold or mildew on the
• Clean the evaporator drain.
evaporator core. • Clean the evaporator. Refer to Odor
. Correction.
• Replace the heater core. Refer to
• The heater core is leaking.
Heater Core Replacement.
• Replace the heater core pipes or
Coolant Smell
• The heater core pipes or hoses are
hoses. Refer to Heater Pipes
leaking.
Replacement (3.BL) or Heater Pipes
Replacement (5. 7L).
Refrigerant Oil Smell
The evaporator core is leaking,
Replace the evaporator core. Refer to
Evaporator Core Replacement.
Mold/mildew odor problem-Under certain climate and operating conditions a musty odor can develop. The odor is caused
by a microbial growth in the evaporator core. This odot is generally temporary, and as climate conditions change, the odor
will disappear. Should the odor persist it may become necessary to clean the evaporator core with an appropriate cleaner.
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 HV AC mod4le ..
• Microbial 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 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 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 ir'I 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 sit
for 3-5 minutes.
8. Seal the 3.175 mm (0.125 in) hole with body
SElaler 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.
(
(
(