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LPS (low pressure switch) or HPS (high pressure switch) is a compressor safety system in the CAR AC system to prevent the compressor from working when the refrigerant or freon is lacking or excessive. There are several models of LPS that are commonly used in CAR AC systems, including 2 pin LPS, 3 pin LPS, and 4 pin LPS. For more information, please watch the video until it's finished. Hopefully helpful, and thank you.