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Posts Tagged: AC hissing noise

AC hissing noise

AC hissing noise — What causes it? An AC hissing noise when your car is running and AC is on can be perfectly normal or a sign of a problem. AC systems work by pressurizing liquid refrigerant and then releasing through a very small opening. Depending on the type of system used by the carmaker the metering device can be an orifice tube usually located in the engine compartment or an expansion valve often located in the cabin area. As they release the high-pressure refrigerant they make a slight AC … Read More

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