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What Causes the Odor When Turning on the Car Air Conditioner?

1 Answers

VanGeorge

07/28/25 4:52pm

Mold growth and humid air are the causes of odors in the air conditioning system. The specific details are as follows: Humid Air: Due to prolonged lack of cleaning of the air filter, combined with humid air during rainy seasons, the air filter becomes damp and warm, leading to mold growth and a musty smell. Mold Growth: Outside air flowing through the air conditioning system ducts inevitably brings moisture and dust. Most of the moisture and dust are expelled from the vehicle through the air conditioning drain, but a small amount of residual moisture in the air conditioning ducts combines with dust from the air. If not cleaned for a long time, this can lead to mold growth, producing sour and rotten odors. Solutions: Regularly clean the air conditioning system or replace the air filter to reduce mold growth; master the correct method of turning the air conditioner on and off. It is generally best to turn off the air conditioning cooling 5 minutes before parking, then switch to natural air to allow the interior temperature to rise quickly. This prevents water condensation in the air conditioning ducts due to temperature differences after parking, keeping the ducts dry and blocking mold and fungus growth. Using natural "air fresheners," such as placing fruits like pineapple, lemon, or apple in the car, can help eliminate odors.

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