Page 3 of the Cabin Air & Filters topic archive. Return to page one for the full topic guide.
For a causes-and-fixes approach, compare the symptom with the owner manual and the vehicle’s normal baseline, then use visible checks before assuming a part has failed. The goal is to confirm the next decision for cabin.
For this “what to check first” angle, compare the symptom with the owner manual and the vehicle’s normal baseline, then use visible checks before assuming a part has failed. The goal is to confirm the next decision.
A musty AC smell often comes from moisture and microbial growth around the evaporator or a dirty cabin air filter. Check the filter and make sure the evaporator drain is working before using fragrance to cover the odor.