Musty Smell from AC in 2020 Ford Explorer
A musty odor when the AC is running typically indicates moisture buildup in the HVAC system, often due to a dirty cabin air filter or mold/mildew growth on the evaporator coil.
Diagnosis Details
Possible Causes
Clogged or dirty cabin air filter restricting airflow and trapping moisture
Mold or mildew on the evaporator coil due to condensation not draining properly
Blocked AC evaporator drain tube causing water accumulation
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What You Should Do
Replace the cabin air filter first.
If odor persists, have the evaporator coil cleaned and check the AC drain tube for clogs.
Use an AC disinfectant spray or run the system on high heat for 10 minutes to dry out moisture.
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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.
