Musty Smell from AC in 2020 Subaru Outback
A musty smell when the AC is on typically indicates moisture buildup in the evaporator or cabin air filter, leading to mold or mildew growth. This is common in humid climates or if the filter hasn't been replaced recently.
Diagnosis Details
Possible Causes
Clogged or dirty cabin air filter
Mold or mildew on the AC evaporator coil
Blocked AC drain tube causing water accumulation
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What You Should Do
Replace the cabin air filter first.
If smell persists, have the AC evaporator cleaned and the drain tube checked for blockages.
Running the fan on high with the AC off for a few minutes before turning off the car 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.
