Not urgent
Musty AC Smell: The Simple Fix Most People Skip
This one's annoying rather than serious, and usually has a cheap fix.
The symptom
A musty smell when the AC turns on, especially after sitting.
What's causing it
Usually fungus growth on the evaporator, more common in humid weather.
What to do
Replace the cabin air filter first — the simplest, cheapest fix. Still smells after that? Get the evaporator professionally cleaned.
See more AC maintenance tips in the GetAutoSure Learning Hub.