What Causes the Bad Smell in Car Air Conditioning?

1 Answers
DeChristopher
07/29/25 5:34pm
Car Air Conditioning Smell Causes: The unpleasant odor that often occurs when turning on the car air conditioning is mostly due to mold growth in the evaporator box and ventilation ducts. Air entering the car passes through the evaporator box to be cooled or heated before being blown out through the vents as warm or cool air. During this process, bacteria, dust, and even insect remains can accumulate in the evaporator box and ventilation ducts. Over time, this buildup leads to bad smells when the air conditioning is used. Solutions: 1. The best method is to choose an open, sunny area, open the car doors, turn on the natural air setting, set the external circulation to maximum (without turning on the air conditioning), or even better, use the heater setting. Let it run for 5-6 minutes to blow out the dust. 2. The air conditioning filter should generally be replaced once a year. However, if there are frequent sandstorms or other harsh weather conditions, replacing it every few months may be necessary. If the filter is only superficially dirty, it can be simply blown clean. However, if it is heavily soiled, cleaning is not recommended as it can enlarge the filter pores, significantly reducing its filtering effectiveness.
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