What Causes Bad Odor in Car Air Conditioning?

1 Answers
PiperLee
07/30/25 12:19am
Car air conditioning can produce bad odors due to the following reasons: 1. Accumulation of dust in the indoor filter and copper tubes: After prolonged use, dust can accumulate inside the indoor filter and copper tubes of the air conditioning system. When this dust reaches a certain level, it starts emitting an unpleasant odor, which is then dispersed into the air when the air conditioning is turned on. 2. Moisture inside the indoor unit: After cooling or heating, the indoor unit often retains moisture. If the air conditioning system lacks a drying or anti-mold function and is turned off immediately, the moisture remains inside, leading to the growth of mold over time, which naturally produces a musty smell.
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