How to Tell if the Expansion Valve is Damaged?

[LaEvangeline]

Methods to determine if the expansion valve is damaged include: if the car's air conditioning vents emit air that is warmer than usual, or if the high-pressure side pressure is too low, or if the low-pressure side shows negative pressure values, or if frost or condensation appears on the inlet side of the expansion valve, or if there is no temperature difference between the inlet and outlet of the expansion valve, these signs indicate that the car's expansion valve is damaged. Additional Information: The functions of the expansion valve are: 1. To throttle and reduce the pressure of high-pressure liquid refrigerant from the dryer, regulating and controlling the amount of liquid refrigerant entering the evaporator to adapt to changes in cooling load and prevent compressor liquid slugging. 2. After passing through the condenser, the high-temperature and high-pressure refrigerant, when passing through the expansion valve, undergoes pressure and temperature reduction, turning into low-pressure and low-temperature liquid refrigerant, thereby creating conditions for the refrigerant to evaporate and cool in the evaporator.