What Causes the Alcohol Smell When Turning on the Car Air Conditioner?

1 Answers
LaFernando
07/28/25 6:43pm
When the car air conditioner emits an alcohol-like odor, it is due to the evaporator coil being a dark and damp area. When the interior temperature is low and the car is suddenly parked, the cold air condenses upon contact with the surrounding air and adheres to the evaporator coil. Even after the occupants leave, moisture remains inside, leading to a fermentation process in the evaporator coil, which produces the alcohol-like smell. The reasons for unpleasant odors in car air conditioners are as follows: 1. Accumulation of dust in the cabin filter and copper coils: After prolonged use, dust builds up inside the cabin filter and copper coils. Once this accumulation reaches a certain level, it generates odors that disperse into the air when the air conditioner is turned on. 2. Moisture inside the indoor unit: After cooling or heating, the indoor unit often retains moisture. If the air conditioner lacks a dry anti-mold function and is turned off immediately, this moisture persists, eventually leading to mold growth and the natural development of a musty smell.
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