What Causes the Unpleasant Odor When the Car Air Conditioner is Turned On?

1 Answers
VonCole
07/30/25 3:48am
Reasons for the unpleasant odor when the car air conditioner is turned on: Air Filter Issue: The function of the air filter is simple, mainly to filter the air output from the air conditioner to prevent impurities from entering the cabin. However, if the air filter is severely contaminated, it not only fails to protect the cabin environment but also causes secondary pollution to the cabin air. Evaporator Issue: When the evaporator is working for cooling, it encounters relatively hot air from the outside, causing moisture to form on its surface. This moisture easily traps dust, insects, and other impurities, leading to fermentation, mold, and bacterial growth in a prolonged damp environment. When the air conditioner is turned on again, the fan will blow these harmful substances into the cabin without hesitation.
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