AC Not Cold with Musty Smell
The AC system is blowing warm air and emitting a musty odor, likely due to a clogged evaporator drain or mold growth in the evaporator case. Low refrigerant or a failing compressor may also cause insufficient cooling.
Diagnosis Details
Possible Causes
Clogged evaporator drain or mold/mildew buildup in the AC evaporator case
Low refrigerant charge (leak or undercharge)
Faulty AC compressor or expansion valve
Related OBD-II Codes
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What You Should Do
Inspect and clean the evaporator drain tube (often under the vehicle).
Use an AC evaporator cleaner foam to kill mold.
Check refrigerant pressure with a gauge set; if low, locate and repair leaks, then recharge.
If compressor is not engaging, test electrical connections and pressure switches.
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.
