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Reasons for Noise After Turning Off Car Air Conditioning

1 Answers

MalachiDella

07/30/25 3:47am

The main reasons for noise after turning off car air conditioning are the following three points: 1. Fan operation: After the air conditioning is turned off, the fan does not stop working immediately but continues to run for a period of time to dry the water on the evaporator and prevent mold growth. This is a normal phenomenon, and the fan will automatically stop running after a few minutes. 2. Power transformer operation: The sound from the power transformer of the indoor unit's control circuit. A power frequency transformer emits a 50Hz humming sound when powered on, which will disappear after the power is completely cut off. 3. Thermal expansion and contraction of the air conditioning shell: The air conditioning shell deforms due to temperature changes, producing intermittent clicking sounds. The sound will stop when the internal temperature of the air conditioning matches the room temperature, which is a normal phenomenon.

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