Why Does the Car Make a Hissing Sound When Turning on the Air Conditioning?

[MacJeremiah]

Here are the reasons why a car's air conditioning may produce abnormal noises: 1. The car's air conditioning compressor is damaged due to lack of lubrication, worn shafts, inability to compress air normally, or air leakage: When the air conditioning compressor has issues, the car's air conditioning system may produce abnormal noises or fail to cool properly. 2. Blocked air conditioning vents: The solution to abnormal noises caused by blocked air conditioning vents is simple; just clean the vents promptly. It's important to note that the car's air conditioning filter should also be cleaned and replaced regularly. Generally, it should be cleaned every 5,000 kilometers. 3. Worn fan blades: If the fan blades are worn, the fan bearings lack lubrication, or the fan blades are stuck by foreign objects, the car's air conditioning may produce a rattling noise. In this case, the fan blades need to be removed for detailed inspection. 4. Engine noise: If the engine belt is loose or produces noise due to other reasons. 5. Blower or air conditioning flap motor noise: Noise may occur due to blockage by foreign objects or damage to the components themselves.