Musty Odor After Rain in 2020 Toyota Tacoma
A musty smell after rain typically indicates moisture intrusion, often from clogged A/C drain tubes, leaking door/window seals, or a wet cabin air filter. In the Tacoma, the most common cause is a blocked A/C evaporator drain or water entering through the fresh air intake.
Diagnosis Details
Possible Causes
Clogged A/C evaporator drain tube causing water to accumulate and produce a musty odor
Leaking door or window seals allowing rainwater to enter the cabin
Wet or contaminated cabin air filter promoting mold and mildew growth
Moisture in the HVAC system or under the carpet from a previous spill or flood
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What You Should Do
Check and clean the A/C evaporator drain tube (often located under the passenger side dashboard).
Inspect door and window seals for gaps or damage.
Replace the cabin air filter if damp or dirty.
Dry out any wet carpet or padding thoroughly.
If the odor persists, have the HVAC system professionally cleaned and treated with an antimicrobial spray.
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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.
