What Are the Reasons for Car Air Conditioning Freezing on Highways?

[DiNova]

Here are five reasons why car air conditioning may freeze: 1. Adjustment issue: The expansion valve is set too low, resulting in excessively low low-pressure. 2. Lack of refrigerant: Insufficient refrigerant in the system causes low evaporation pressure. 3. Internal circulation: The internal circulation filter is clogged. 4. Temperature control failure: The temperature control (or temperature sensor) malfunctions, preventing the compressor from shutting off. 5. Control valve failure: The energy control valve (pressure regulating valve) of the variable displacement compressor fails, causing the compressor to operate at full capacity continuously, leading to excessively low low-pressure and frost formation on the evaporator. Of course, the level of low-pressure is also influenced by ambient temperature and cabin temperature.