A/C Not Cold with Musty Odor
The A/C system is not producing cold air and emits a musty smell when turned on. This typically indicates a clogged or dirty evaporator core, low refrigerant, or mold/bacteria growth in the system.
Diagnosis Details
Possible Causes
Clogged or dirty cabin air filter restricting airflow and causing odor
Mold or mildew buildup on the evaporator core due to moisture
Low refrigerant level (leak) reducing cooling performance
Faulty A/C compressor or expansion valve
Related OBD-II Codes
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What You Should Do
Replace the cabin air filter first.
If odor persists, use an A/C evaporator cleaner spray (foam) into the intake.
Check refrigerant pressure with a gauge; if low, inspect for leaks and recharge.
If cooling still fails, have a professional diagnose the compressor and expansion valve.
Related Repairs
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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.
