How to Solve Ice Blockage in Car Air Conditioning?

[SanMolly]

"The simplest method to address ice blockage in car air conditioning is to recharge the refrigerant. First, evacuate the refrigerant, then purge the system with nitrogen to remove air before adding the refrigerant back in, and replace the desiccant. One of the reasons for ice blockage in car air conditioning is the presence of moisture in the refrigeration system, where water freezes and causes the blockage. Ice blockage can only occur at the throttling points in the refrigeration system, specifically at the expansion valve's throttle orifice. Since refrigerant and water are generally immiscible, when the refrigerant flows through the small throttle orifice of the expansion valve, the temperature suddenly drops, causing any moisture mixed with the liquid refrigerant to freeze around the throttle orifice or valve needle hole. Another possible reason could be a malfunction in the air conditioning evaporator temperature sensor, preventing it from cutting off the compressor and stopping refrigeration when the temperature reaches a critical point. In such cases, you can check if the evaporator temperature sensor has failed or is disconnected, or adjust the critical temperature setting of the thermostat."