Musty Smell from AC in 2020 Chevrolet Silverado 1500
A musty odor when the AC is on typically indicates moisture buildup in the HVAC system, often due to a dirty cabin air filter, mold in the evaporator, or a clogged evaporator drain.
Diagnosis Details
Possible Causes
Dirty or clogged cabin air filter restricting airflow and trapping moisture
Mold or mildew growth on the evaporator coil due to condensation
Clogged evaporator drain tube causing water to pool and produce musty smell
Debris or leaves in the HVAC intake or blower motor area
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What You Should Do
Replace the cabin air filter first.
If odor persists, inspect and clean the evaporator coil with a no-rinse AC cleaner, and check the evaporator drain for clogs.
Run the fan on high with windows down for a few minutes after using AC to 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.
