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Removing pressure from fluid causes it to lose temperature. Put pressure into a fluid you will increase its temperature. This is the opposite process that the compressor performs.
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The expansion of the refrigerant causes the temperature of the refrigerant to drop. The pressure drops in the expansion valve, allowing the refrigerant to expand.
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After that, the refrigerant goes through the expansion valve. Next in the system is the receiver-drier, whose primary purpose is to remove moisture from the A/C refrigerant. By flowing through the condenser, the refrigerant loses heat, which converts into a warm liquid from hot gas. From the compressor, the fluid goes to the condenser. The operation of the A/C in your car is based on the First Law of Thermodynamics if you want to learn the physics behind it. The compressor’s purpose is to add pressure to the system by compressing the refrigerant. One of the key components of the A/C system is the compressor.
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