The air conditioning (A/C) system may emit odors at startup in hot climates. Debris in the heater/evaporator case or growth of mold on the evaporator core may cause the odor. A service kit is available through GMSPO. A single application of this deodorizer, GM P/N 12377951, will remove the odor from the A/C system.

1. Clear all the debris from the plenum that draws air from the outside.
2. Disconnect the clutch coil. Disconnecting the coil will disable the A/C compressor clutch operation.
3. Turn the engine on in order to dry the evaporator core. Run the blower motor on high and on a recirculating mode, with a temperature control on maximum heat for 10 minutes.
4. Remove the passenger compartment air filters. Refer to Passenger Compartment Air Filter Replacement .
5. Keep the blower motor on high. Insert the extension tube of the deodorizer, GM P/N 1237795, into the hole past the mark on the tube.

Important: Use safety goggles and latex gloves for the following step.

6. Spray the area with short bursts. Dispense the contents of the can over a 2-3 minute period. Vary the direction of the spray into the duct.
7. Turn the engine off.
8. Let the engine sit for 3-5 minutes.
9. Start the engine. Run the fan on high for 15-20 minutes in order to dry the area.
10. Reconnect the A/C compressor clutch coil. Verify the operation of the A/C system.