What Causes Car AC Pipe Freezing and No Cooling?

[KingstonAnn]

Car AC expansion valve freezing and no cooling is a refrigerant system icing phenomenon. The specific causes may include the following: The expansion valve's adjustment is too small, resulting in excessively low low-pressure. Insufficient refrigerant in the system causes low evaporation pressure. Clogged interior circulation filter. Malfunctioning thermostat (or temperature sensor) prevents compressor shutdown. Failure of the variable displacement compressor's energy control valve (pressure regulator) keeps the compressor operating at full capacity, causing excessively low pressure and evaporator frosting. Moisture in the refrigerant freezes at low temperatures, forming ice plugs that block capillary tubes. Once capillary tubes are blocked, the refrigeration system cannot cool.