Musty Smell from AC in 2020 Ford Mustang
A musty odor when the AC is on typically indicates moisture buildup in the evaporator core or cabin air filter, leading to mold or mildew growth. This is common in humid conditions and is not a safety hazard but can be unpleasant.
Diagnosis Details
Possible Causes
Clogged or dirty cabin air filter trapping moisture and debris
Mold or mildew on the AC evaporator core due to condensation
Blocked AC drain tube causing water accumulation
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What You Should Do
Replace the cabin air filter first.
If smell persists, use an AC evaporator cleaner spray (follow product instructions) and check the AC drain tube for clogs.
Running the fan on high with heat for 10 minutes can help dry the system.
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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.
