Musty AC Smell in Ford F-150 2020
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 or if the filter hasn't been changed recently.
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 to pool in the system
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What You Should Do
Replace the cabin air filter first.
If the smell persists, use an AC evaporator cleaner spray (following product instructions) and check the AC drain tube for clogs.
Run the fan on high with heat for 10 minutes to 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.
