What causes high low pressure and low high pressure in car AC with no cooling?

[ZacharyLynn]

The reasons for low high pressure and high low pressure in car AC are as follows: When pressure gauges show this phenomenon and there's sufficient refrigerant in the pipelines, yet the AC fails to cool, the issue likely lies with the AC compressor. There may be internal leakage in the compressor, and generally replacing the compressor can resolve the problem. Below are relevant details about car AC: 1. Components of car AC: The car AC system mainly consists of compressor, electromagnetic clutch, condenser, evaporator, expansion valve, receiver drier, hoses, condenser fan, vacuum solenoid, idle speed controller and control system. 2. Classification of car AC: Car AC has high-pressure lines and low-pressure lines: (1) The high-pressure side includes compressor output side, high-pressure lines, condenser, receiver drier and liquid lines. (2) The low-pressure side includes evaporator, accumulator, return lines, compressor input side and compressor oil sump.