What Causes the Unpleasant Odor from Car Air Conditioning?
2 Answers
There are several reasons for unpleasant odors in car air conditioning, including dirt inside the evaporator and uncleaned air filters. Here are the specific explanations: Dirt inside the evaporator: The evaporator is a key component of the air conditioning system. During the cooling process, it comes into contact with external air. In large cities or industrial areas where the air is more polluted, dirt and dust can be drawn into the air conditioning circulation system, leading to unpleasant odors. Uncleaned air filter: The air filter's main function is to filter the air. Over time, dirt can accumulate on it. If it is not cleaned or replaced for a long time, it can easily produce odors.
I've driven several cars and encountered strange smells from the AC, most commonly due to bacterial or mold growth on the evaporator. After using the AC, if the internal moisture doesn't dissipate, it can lead to mold over time, especially when the cabin air filter is too dirty. Sometimes leaves or dust falling into the system can also cause odors. It's recommended to turn off the AC a few minutes before parking and let the system dry with natural airflow, which effectively prevents moldy smells. Replace the filter regularly, about every 10,000 kilometers. If the smell is strong, you can use a specialized cleaner spray or have a thorough cleaning at a car wash. If the odor persists after cleaning, it might be a chemical issue like compressor refrigerant leakage, though this is less common.
