What causes high low pressure and low high pressure in car AC with no cooling?
1 Answers
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 pipeline, yet the AC fails to cool, the issue likely lies with the AC compressor. There may be internal leakage in the compressor, and replacing it usually solves the problem. Below are relevant details: 1. Components of car AC: The car air conditioning 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: The car AC system is divided into high-pressure and low-pressure pipelines: (1) The high-pressure side includes compressor output side, high-pressure pipelines, condenser, receiver drier, and liquid pipelines; (2) The low-pressure side includes evaporator, accumulator, return pipelines, compressor input side, and compressor oil sump. 3. Components of car AC refrigeration system: The car AC refrigeration system consists of compressor, condenser, receiver drier, expansion valve, evaporator, and blower. These components are connected by copper pipes (or aluminum pipes) and high-pressure rubber hoses to form a sealed system. During operation, refrigerant circulates through this closed system in different states, with each cycle divided into four basic processes: compression, heat dissipation, throttling, and heat absorption. These processes repeat continuously to achieve the purpose of lowering the air temperature around the evaporator.
