How to Deal with Frozen Car Air Conditioning?

[StLuna]

Normally, the evaporator does not freeze. When the evaporator coil freezes, it affects heat transfer, increases thermal resistance, and reduces cooling efficiency and airflow. The causes and solutions for a frozen car air conditioning evaporator coil are as follows: 1. Insufficient Refrigerant Split-type air conditioners may experience refrigerant leakage or seepage due to installation issues or prolonged use. A reduced amount of refrigerant in the system leads to low evaporation pressure, causing the evaporator to freeze, typically in the front section. The solution is to repair the leak and refill the refrigerant, which will resolve the issue. 2. Compressor Malfunction Over time, the compressor's efficiency may decrease, or the compressor's gas distribution system may fail, resulting in low pressure and freezing. The freezing also occurs in the front section of the evaporator. Adding some refrigerant can fix the issue in the former case. If the problem persists, the compressor must be replaced. 3. Temperature Sensor Failure In mechanical thermostats, the gas pressure in the temperature-sensing bulb changes with temperature, triggering the thermostat's contacts. If the contacts stick together or the spring lacks sufficient tension, the contacts may remain closed, causing the air conditioner to run continuously and freeze. Replacing the thermostat will resolve the issue.