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Why Does the Car Air Conditioner Emit an Unpleasant Odor When Turned On?

1 Answers

McPaislee

07/30/25 1:08am

Opening the car air conditioner produces an unpleasant odor due to mold in the evaporator box and ventilation ducts. Below are the specific reasons and solutions: Reasons for the unpleasant odor in the car air conditioner: When air enters the car, it passes through the evaporator box to be cooled or heated before being blown out as warm or cool air through the vents. During use, bacteria, dust, and even insect remains inevitably enter the evaporator box and ventilation ducts, leading to the odor when the air conditioner is in operation. Solutions for the unpleasant odor in the car air conditioner: 1. Inspect the air conditioner's air ducts. The best method is to choose an open, sunny area, open the car doors, turn on the natural air, set the external circulation to maximum (without turning on the air conditioner), or even better, turn on the heater, and let it blow for 5-6 minutes to expel the dust. 2. Check the air conditioner filter. The air conditioner filter should generally be replaced once a year, but if there are frequent sandstorms or other harsh weather conditions, replacing it every few months may be necessary. 3. Mold on the evaporator box. This situation is the most difficult to handle. Generally, it is best to seek help from a professional auto repair shop to perform an air conditioner cleaning. They spray a specialized air conditioner cleaner into the blower while the air conditioner is running. However, this process should not be attempted on your own, as it can easily damage the blower.

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