Musty Odor After Rain in 2019 Honda Accord
A musty smell after rain typically indicates moisture accumulation in the cabin, often from a clogged evaporator drain, wet cabin air filter, or water intrusion from seals. This can lead to mold and mildew growth, affecting air quality and comfort.
Diagnosis Details
Possible Causes
Clogged HVAC evaporator drain tube preventing condensation from draining, causing water to pool and produce a musty odor.
Wet or contaminated cabin air filter that has absorbed moisture and developed mold or mildew.
Water leaks from sunroof drains, door seals, or windshield seal allowing rainwater to enter the cabin and soak carpets or insulation.
Mold or mildew growth in the HVAC system due to prolonged moisture, especially if the A/C is used infrequently.
Related OBD-II Codes
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What You Should Do
Inspect and clean the HVAC evaporator drain tube (located under the vehicle near the firewall) to ensure it is not clogged.
Replace the cabin air filter if damp or dirty.
Check for water leaks by examining carpets, floor mats, and headliner for dampness.
If leaks are found, seal sunroof drains, door seals, or windshield as needed.
Run the A/C on high with recirculation off for 10-15 minutes to dry the system, and consider using an A/C cleaner or disinfectant spray designed for HVAC systems.
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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.
