What is the appropriate pressure for automotive air conditioning refrigerant?

[McBenjamin]

Automotive air conditioning refrigerant pressure specifics are as follows: 1. Under compressor operation at 1500~2000rpm, the high pressure (discharge pressure) should be around 1.5~2.0mpa, and the low pressure (suction pressure) around 0.15~0.35mpa for normal operation. The exact values depend on different vehicle air conditioning system configurations and ambient temperatures. 2. At idle speed (engine 700~900rpm), if the ambient temperature is high, such as under direct summer sunlight, the high pressure may be slightly higher, reaching up to approximately 2.5~2.8mpa, but generally should not exceed 3.1mpa.