What Causes Low High Pressure in Car Air Conditioning?

[LaJayla]

Car air conditioning low high pressure may be caused by insufficient refrigerant charge, refrigerant leakage in the system, blockage in the high-pressure pipeline before the expansion valve, or the expansion valve opening being too small. The expansion valve is a crucial component in the refrigeration system, typically installed between the liquid storage tank and the evaporator. The expansion valve converts medium-temperature, high-pressure liquid refrigerant into low-temperature, low-pressure wet steam through throttling. The refrigerant then absorbs heat in the evaporator to achieve the cooling effect. The expansion valve controls the valve flow based on the superheat change at the evaporator outlet to prevent insufficient utilization of the evaporator surface area and compressor knocking. Some reasons for compressor damage are as follows: 1. The air conditioning system is unclean, with particulate impurities being sucked into the compressor; 2. The compressor operates at excessively high temperatures or for too long; 3. The compressor lacks oil, leading to severe wear.