Musty AC Odor in Tesla Model 3
A musty smell when the AC is on typically indicates moisture buildup and microbial growth (mold, mildew) in the evaporator case or cabin air filter. This is common in humid climates and not a safety issue, but can be unpleasant.
Diagnosis Details
Possible Causes
Moisture and mold in the evaporator housing due to lack of evaporator dry cycle after AC use.
Clogged or dirty cabin air filter allowing mold growth.
Blocked AC drain tube causing water accumulation in the HVAC case.
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What You Should Do
Replace the cabin air filter and clean the evaporator with a foam cleaner or use a disinfectant spray.
Run the fan on high with heat for 10-15 minutes to dry out the system.
If smell persists, have a shop inspect and clean the evaporator housing and drain tube.
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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.
