For 1990-2009 cars

Condition | Possible Cause | Correction
--- | --- | ---
Musty Smell |

• | Water leaks (body)

• | Evaporator drain

• | Mold or Mildew

• | Seal the body.

• | Clean the drain.

• | Clean the evaporator.

Coolant Smell | Anti-freeze |

• | Replace the heater core. Refer to Heater Core Replacement .

• | Replace the heater pipes and hoses.

Refrigerant Leak | Refrigerant oil | Replace the evaporator core. Refer to Air Conditioning Evaporator Core Replacement .