What Causes Low High Pressure and High Low Pressure in Car Air Conditioning?
1 Answers
If the pressure gauge shows low high pressure and high low pressure in a car's air conditioning system while the refrigerant level in the pipelines is adequate but cooling performance is poor, this typically indicates a compressor malfunction. Internal leakage within the compressor is usually the culprit, and replacing the compressor generally resolves the issue. Introduction to Car Air Conditioning: An automotive air conditioning system primarily consists of the compressor, electromagnetic clutch, condenser, evaporator, expansion valve, receiver-drier, hoses, condenser fan, vacuum solenoid, idle speed controller, and control system. The system has high-pressure and low-pressure circuits. The high-pressure side includes the compressor output, high-pressure lines, condenser, receiver-drier, and liquid lines. The low-pressure side comprises the evaporator, accumulator, suction lines, compressor intake, and compressor oil sump. Automotive Air Conditioning Refrigeration System: The refrigeration system consists of the compressor, condenser, receiver-drier, expansion valve, evaporator, and blower, interconnected by copper (or aluminum) pipes and high-pressure rubber hoses to form a sealed system. During operation, refrigerant circulates through this closed system in different states. Each cycle involves four fundamental processes: compression, heat dissipation, throttling, and heat absorption. These processes repeat continuously to lower the air temperature around the evaporator.