Musty Smell from AC in 2019 Honda Accord
A musty smell when the AC is on typically indicates moisture buildup in the HVAC system, often due to a dirty cabin air filter, clogged evaporator drain, or microbial 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
Clogged evaporator drain tube causing water to pool and produce musty odors
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What You Should Do
Replace the cabin air filter first.
If smell persists, inspect and clean the evaporator drain tube and consider using an AC evaporator cleaner spray.
In persistent cases, professional HVAC system cleaning may be needed.
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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.
