Odors may be emitted from the air conditioning system primarily at startup in hot, humid climates. The following conditions may cause this odor:

When the blower motor fan is turned on, the microbial growth may release an unpleasant, musty odor into the passenger compartment. To remove odors of this type, the microbial growth must be eliminated. Perform the following procedure:

1. Ensure that the plenum which draws outside air into the HVAC module is clear of debris.
2. Disable the A/C compressor clutch operation by disconnecting the clutch coil electrical connector.
3. Remove the passenger compartment air filter. Refer to Passenger Compartment Air Filter Replacement .
4. Dry the evaporator core by performing the following steps:

4.1.	Start the engine.

4.2.	Select the warmest temperature setting.

4.3.	Select the recirculation mode.

4.4.	Run the blower motor on high for 10 minutes.

5. Locate an area in the air conditioning duct between the blower motor and the evaporator core, downstream of the blower motor.
6. Drill a 3.175 mm (0.125 in) hole in the duct where it will not interfere with or damage the following components:

•	The blower motor

•	The evaporator core

•	Any other part of the A/C system

7. Wear safety goggles and latex gloves in order to perform the following actions:

7.1.	Select the maximum blower speed.

7.2.	Insert the deodorizer extension tube into the hole in the duct. Ensure that the tube is inserted to the mark on the tube.

7.3.	Use short spray bursts into the duct, and vary the direction of the spray over a 2-3 minute period.

8. Turn the engine OFF. Allow the vehicle to sit for 3-5 minutes.
9. Seal the 3.175 mm (0.125 in) hole in the duct with body sealer or RTV gasket compound.
10. Start the engine.
11. Operate the blower motor on HIGH for 15-20 minutes to dry.
12. Install the passenger compartment air filter. Refer to Passenger Compartment Air Filter Replacement .
13. Reconnect the air conditioning compressor clutch coil and verify proper operation.

To prevent the odor from returning, enabling the blower control function with the scan tool is recommended. Refer to Afterblow Enabling .