Tools Required

J 36645 Air Conditioning Cleaning Gun

In hot, humid climate the air conditioning (A/C) system may emit odors. The following conditions may cause the odors:

In order to correct the odor condition, use the following procedure:

Important: If disinfectant gets into the eyes, hold the eyelids open and flush the eyes with a steady, gentle stream of water for 15 minutes. Obtain medical attention if the irritation persists.

1. Put on rubber gloves and safety glasses.
2. Pour a small bottle of the 2-part GM Goodwrench® Air Conditioning System Disinfectant GM P/N 25533404, or an equivalent, into the large bottle. Seal and invert the large container once or twice in order to mix the contents.
3. Inspect underneath the vehicle in order to verify that the drain outlet is not plugged.
4. Connect the battery charger in order to avoid draining the battery during the cleaning procedure.
5. Remove the blower motor resister. Leave the wiring connectors attached.
6. Inspect the heater/A/C evaporator module for debris.

Remove any debris that is present through the blower resistor opening:

•	If the debris is imbedded into the A/C evaporator core face and cannot be removed, remove the core from the vehicle and clean the core.

•	If a large amount of debris is present in the heater/A/C evaporator case, the air inlet screen will require sealing around the air intake in the cowl area.

7. Turn the ignition switch to the ON position. Do not start the vehicle.
8. Set the mode selector to the following positions:

•	Max/Rec/Rc

•	The blower speed to 1

•	The temperature to full cold

9. Open all of the windows and the doors.
10. Exit the vehicle.
11. Place a drain pan with at least a 2 quart capacity below the heater/A/C evaporator drain hole in order to collect the disinfectant and the rinse water runoff. If necessary, install an additional hose onto the drain in order to ensure that all of the fluid goes into the drain pan.
12. Turn the pedestal fan to 4 in order to provide cross ventilation during the cleaning procedure.

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

13. Use the J 36645 , or an equivalent spray gun, while performing the following procedure:

13.1.

Insert the nozzle of the spray gun through the blower resistor opening.

13.2.

Insert the siphon hose into the container of the disinfectant.

13.3.

Ensure that the corner and the edges have adequate coverage.

13.4.

Spray directly toward the A/C evaporator face.

13.5.

Completely saturate the core. Use the entire container of the solution.

14. Turn the ignition to the OFF position. Allow the core to soak for 5 minutes.
15. Verify the proper drain operation underneath the vehicle. If necessary, unclog and increase the drain plug slits with a razor blade or sharp knife.
16. Turn the ignition to the ON position. Do not start the vehicle.
17. Use the spray gun to thoroughly rinse the A/C evaporator core with 2 quarts of clean water in order to remove all of the disinfectant residue.
18. Turn the ignition to the OFF position.
19. Reinstall the blower resistor.
20. Properly dispose of the disinfectant and the rinse water runoff.