Ford F-150 2020 AC Not Cold with Musty Smell
The AC system is blowing warm air and emitting a musty odor when turned on. This typically indicates a refrigerant leak or a failing compressor combined with microbial growth in the evaporator case.
Diagnosis Details
Possible Causes
Low refrigerant charge due to a leak (common at seals, compressor, or condenser).
Clogged or dirty cabin air filter causing restricted airflow and musty smell.
Mold or mildew buildup on the evaporator coil (common in humid climates).
Faulty AC compressor or clutch not engaging.
Related OBD-II Codes
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What You Should Do
First, check the cabin air filter and replace if dirty.
Then inspect the AC system for refrigerant leaks using a UV dye or electronic leak detector.
If the compressor clutch is not engaging, test the refrigerant pressure and electrical connections.
Clean the evaporator coil with a specialized AC coil cleaner to eliminate the musty smell.
Recharge the system to the correct refrigerant level if low.
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.
