Identify when the smell appears
A musty odor when the blower starts can involve moisture and contamination around the evaporator, not only a dirty cabin filter. Record whether it occurs with cooling on, ventilation alone or after the car has sat overnight.
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Start with accessible maintenance
Inspect and replace the cabin filter according to the vehicle procedure. Check for wet carpets or other water-entry evidence that would require a separate repair. A scented spray can conceal the symptom without removing its cause.
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Use appropriate cleaning
DENSO warns that unsuitable chemicals can damage the evaporator coating. Persistent contamination may need professional evaporator cleaning. Follow the vehicle’s operating advice; DENSO also suggests leaving the blower running briefly after switching cooling off to help dry internal surfaces.
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- Manufacturer technical reference ↗Reviewed Oct 6, 2026
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