When the high pressure of the liquid drops, it causes the refrigerant to vaporize. The purified liquid refrigerant flows through the A/C hoses into the cabin of the car, where it travels through a small orifice called the thermal expansion valve.Any moisture combined with refrigerant can form a corrosive acid harmful to the system. The still-highly-pressurized liquid then flows into the receiver-drier, which contains a filter to remove any debris within the system as well as any moisture or impurities from the refrigerant.Inside the condenser, the high-pressure gas changes (condenses) to form a high pressure liquid as the heat from the refrigerant is released to the air. The purpose and function of the condenser is similar to the cooling system radiator, which removes heat from the high-pressure gas. The high-pressure gas flows out of the compressor into the condenser, which is usually located in front of the radiator.Once the compressor clutch engages (suction and discharge cycle), it compresses the low-pressure refrigerant gas into a high-pressure gas. Think of the A/C system operating in a continuous loop that is split into a high-pressure side and low-pressure side at the compressor.
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