Musty Smell from AC in 2020 Toyota Camry
A musty odor when the AC is on typically indicates mold or mildew growth in the evaporator core or cabin air filter. This is common in humid climates and is not an immediate safety concern but can affect comfort and air quality.
Diagnosis Details
Possible Causes
Clogged or dirty cabin air filter allowing moisture and debris to accumulate
Mold or mildew buildup on the evaporator coil due to condensation
Blocked AC drain tube causing water to pool in the HVAC case
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What You Should Do
Replace the cabin air filter first.
If the smell persists, use an AC evaporator cleaner spray (foaming type) applied through the air intake.
Check the AC drain tube for clogs and clear if necessary.
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.
