Important: Under certain climate and operating conditions, a musty odor develops from mold growth in the evaporator core face. This odor is generally temporary. As climate conditions change the odor will disappear and repair automatically. If the odor persists, remove the evaporator core. Clean the evaporator core face with the appropriate cleaner.

Musty Smell

Water leaks from the body.

Seal the body.

The evaporator drain is clogged.

Clean the drain.

Mold or mildew is present.

Clean the evaporator.

Coolant Smell

The anti-freeze leaks.

1. Inspect the heater core.
2. Inspect the pipes.
3. Inspect the hoses.
4. Repair or replace the components as necessary.

Refrigerant Oil Smell

The refrigerant oil leaks.

Inspect the evaporator core. Repair or replace the evaporator core as necessary. Refer to Air Conditioning Evaporator Core Replacement .