Musty Smell from AC in 2020 Nissan Rogue
A musty odor when the AC is on typically indicates moisture buildup in the evaporator core or cabin air filter, leading to mold or mildew growth. This is common in humid conditions and is not immediately dangerous but can affect air quality.
Diagnosis Details
Possible Causes
Clogged or dirty cabin air filter trapping moisture and debris
Mold or mildew on the AC evaporator core due to condensation not draining properly
Blocked AC drain tube causing water to pool in the HVAC housing
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What You Should Do
Replace the cabin air filter first.
If the smell persists, have the evaporator coil cleaned and the AC drain tube checked for blockages.
Running the fan on high with the AC off for a few minutes before turning off the car can help 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.
