GM Service Manual Online
For 1990-2009 cars only

Condition

Possible Cause

Correction

Musty Smell

    â€¢ Water leaks (body)
    â€¢ Evaporator drain
    â€¢ Mold or Mildew
    â€¢ Seal the body.
    â€¢ Clean the drain.
    â€¢ Clean the evaporator.

Coolant Smell

Anti-freeze

    â€¢ Replace the heater core. Refer to Heater Core Replacement .
    â€¢ Replace the heater pipes and hoses.

Refrigerant Leak

Refrigerant oil

Replace the evaporator core. Refer to Air Conditioning Evaporator Core Replacement .