What Causes the Abnormal Noise in the Car Air Conditioning Expansion Valve?
1 Answers
Abnormal noise in the car air conditioning expansion valve can be caused by the following reasons: 1. Noise inside the glove box: A sound similar to flowing water is heard from the glove box when the air conditioning is turned on. This is the expansion valve working, which is a normal phenomenon. 2. Noise inside the air conditioning ducts: The air conditioning filter has not been replaced for a long time, and there are foreign objects such as leaves in the ducts. Solution: Open the air conditioning cover plate under the glove box on the passenger side, cover it with a gauze bag, start the car, and turn the fan to the highest setting to blow out the foreign objects. Alternatively, a repair shop can use high-pressure airflow to remove the foreign objects. 3. Moisture in the refrigerant: There is air or moisture in the refrigerant inside the air conditioning compressor, causing abnormal noise during refrigerant evaporation and expansion. Solution: Extract and replace the refrigerant. Note: If the noise recurs after some time and is located inside the dashboard, the efficiency of the dryer bottle is likely reduced. If the noise persists after replacing the refrigerant and is located near the compressor, there is a high probability of internal mechanical damage to the compressor.
