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Whistling air conditioners in cars. As i am driving in my car I am wondering why my car's air conditioner has a whistling noise coming out of it, this is ver. The probable causes of a hissing noise are internal valve leaks, leaky refrigerant lines, worn-out AC clutch, and faulty compressors. If the hissing is emitting from the air vents, consider inspecting the air ducts for leaks. Hissing sounds are annoying and unnerving but don't pose a catastrophic danger to the AC units. The hissing sound is caused by the audible action of the pressure rising and falling as it metering into the evaporator makes the pressure to increase and fall. If your air conditioner produces a hissing sound whenever it is turned on, it might be an indication of a refrigerant leak. When you switch off your vehicle, this happens automatically.
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