AC Not Cold with Musty Smell
The musty smell when the AC is on typically indicates mold or mildew growth in the evaporator case, often due to a clogged evaporator drain or lack of cabin filter maintenance. Reduced cooling may also be present if the system is low on refrigerant or the compressor is not engaging properly.
Diagnosis Details
Possible Causes
Clogged evaporator drain causing moisture buildup and mold growth
Dirty or saturated cabin air filter allowing contaminants and odors into the cabin
Low refrigerant charge or failing compressor reducing cooling performance
Related OBD-II Codes
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What You Should Do
Replace the cabin air filter if dirty.
Clean the evaporator drain tube to ensure proper drainage.
Use an AC evaporator cleaner foam to kill mold and mildew.
If cooling remains poor, have the refrigerant level and compressor operation checked by a professional.
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Disclaimer: This AI-generated diagnosis is for informational reference only. Always consult a qualified mechanic for an in-person inspection. AutOwner is not responsible for decisions made based on this information.
