What is the fault when a car's air conditioning has high low pressure and low high pressure?

[SilasLee]

Car air conditioning has high low pressure and low high pressure because: the displacement produced by the compressor does not meet the requirements, leading to expansion valve failure; the lack of cooling is due to insufficient refrigerant in the compressor. Details are as follows: The displacement produced by the compressor does not meet the requirements: If there is high low pressure and low high pressure, it needs to be repaired, and professionals should check all faults. If the compressor's high-pressure pipe turns black, it needs to be replaced. When the air conditioning operates at normal pressure, it is fine. Insufficient refrigerant: If there is insufficient refrigerant, you can add some refrigerant. Compressor faults need to be checked for blockages or leaks. Blockages are due to dirt and need to be cleaned, while leaks require repairing the leakage points.