Musty Odor After Rain
A musty smell inside the vehicle after rain typically indicates moisture intrusion, often from a clogged evaporator drain, leaking door/window seals, or a wet cabin air filter. This can lead to mold and mildew growth, affecting air quality and potentially causing respiratory issues.
Diagnosis Details
Possible Causes
Clogged HVAC evaporator drain – water accumulates in the system and produces a musty odor.
Leaking door or window seals – rain water enters the cabin and soaks carpets or upholstery.
Wet cabin air filter – moisture trapped in the filter creates a breeding ground for mold.
Sunroof drain blockage – water overflows into the headliner or floor.
Related OBD-II Codes
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What You Should Do
Inspect and clean the HVAC evaporator drain tube.
Check for water intrusion under carpets and in footwells.
Replace the cabin air filter if damp or moldy.
Examine door, window, and sunroof seals for leaks.
Use a moisture meter to confirm damp areas.
Dry the interior thoroughly and treat with an antimicrobial cleaner.
Related Repairs
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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.
