A/C System Cleaning Procedure

Some vehicles may experience odors emitted from the air conditioning system primarily at start up in hot, humid climates. This odor may be the result of debris in the heater/evaporator case or microbial growth on the evaporator core. To address this condition, the evaporator must be removed from the vehicle and cleaned.

Tool Required:
J 36645 Air Conditioning Cleaning Gun GM Goodwrench Air Conditioning system Disinfectant Kit

Important
^ If disinfectant gets into eyes, hold eyelids open and flush with a steady, gentle stream of water for fifteen minutes. Obtain medical attention if irritation persists.

1. Remove evaporator from vehicle.
2. Put on rubber gloves and safety goggles.
3. Pour the small bottle of the two-part GM Goodwrench Air Conditioning system disinfectant Kit into the large bottle. Seal and invert the large container once or twice to mix contents.
4. Check heater/evaporator case for debris. Remove any debris present. If a large amount of debris is present in the heater/evaporator case check the air intake in the cowl area.
5. Using J 36645, Insert siphon hose into container of disinfectant. Spray directly on evaporator face taking extra care to ensure adequate coverage of the corner and edges, completely saturating the entire core. Use the entire container of solution.

Important
^ Do not allow disinfectant to come into contact with hot engine components such as the exhaust manifold.

6. Check underneath the vehicle to verify proper drain operation. If necessary, unclog and increase drain plug slits with a razor blade or sharp knife.
7. Thoroughly rinse the evaporator core with clean water using the spray gun to remove all disinfectant residue. At least a two quart rinse is recommended.
8. Dispose of disinfectant properly and rinse water runoff collected in the drain pan in an approved manner.