Heating and Air Conditioning: Service and Repair

Odor Correction

Under certain climate and operating conditions a musty odor may develop. Growth in the evaporator core causes the musty odor. This odor is generally temporary. As climate conditions change, the odor disappears. If the odor persists you may have to clean the evaporator core with the appropriate cleaner.

IMPORTANT: Do not operate the A/C compressor at any time during this procedure.

1. Ensure that the plenum duct that draws in air from the outside is clear of all debris.
2. Use the following procedure in order to dry the evaporator core:
2.1. Start the engine.
2.2. Turn the blower on HIGH, with the temperature set on maximum for 10 minutes.
2.3. Turn the engine OFF.
3. Shake the deodorizer spray can well. Insert the extension tube into the nozzle on the can.
4. Remove the blower motor resistor.
5. Start the engine. Turn the blower on HIGH.
6. Using safety goggles and latex gloves, insert the extension tube into the resistor hole past the mark on the tube. Spray with short bursts, dispensing the contents of the can over a 2 to 3 minute period.
7. Turn the engine OFF. Let the engine sit for 3 to 5 minutes.
8. Start the engine and run the blower on HIGH for 15 to 20 minutes in order to dry the evaporator.