Musty Smell from AC in 2019 Nissan Altima
A musty odor when the AC is running typically indicates moisture buildup in the evaporator core or cabin air filter, leading to mold or mildew growth.
Diagnosis Details
Possible Causes
Clogged or dirty cabin air filter
Mold or mildew on the AC evaporator core
Blocked AC drain tube causing water accumulation
Not satisfied with this diagnosis?
Try Another DiagnosisWhat To Do Next
What You Should Do
Replace the cabin air filter first.
If the smell persists, have the evaporator core cleaned and the AC drain tube checked for blockages.
Use an AC disinfectant spray or run the fan on high with heat to dry out the system.
Related Repairs
Share this diagnosis
Help others with similar symptoms
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.
