Musty Smell from AC in 2019 Hyundai Elantra
A musty odor when the AC is on typically indicates moisture buildup in the HVAC system, often due to a dirty cabin air filter 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 AC evaporator coil from condensation not draining properly
Blocked AC drain tube causing water accumulation in the HVAC case
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What You Should Do
Replace the cabin air filter first (located behind the glove box).
If smell persists, use an AC evaporator cleaner spray and check the drain tube for clogs.
Run the fan on high with heat for 10 minutes to dry out 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.
