What Causes the Unpleasant Odor in BMW X3's Air Conditioning?

1 Answers
CharlesLee
07/29/25 4:17pm
Air conditioning odors are caused by a dirty air filter or evaporator core. Air Filter Issues: The function of the air filter is simple—it primarily filters the air output 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 Core Issues: When the evaporator is operating for cooling, it encounters relatively hot external air, causing moisture to form on its surface. This moisture easily traps dust, insects, and other impurities. Over time in a damp environment, these substances ferment, mold, and breed bacteria. When the air conditioning is turned on again, the blower will forcefully circulate these harmful substances into the cabin.
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