What are the causes of freezing of automobile air conditioners and how to solve them?

The reasons for freezing of automobile air conditioner are: insufficient refrigerant, compressor failure, excessive refrigerant, dirty evaporator and temperature control sensor failure. Solution to freezing of automobile air conditioner: Split air conditioner will leak steam or refrigerant after long-term use, which will reduce the refrigerant in the refrigeration system, cause the evaporation pressure to be too low, and cause the evaporator to freeze. It is suggested to deal with the leaking part first and add refrigerant. If the fault cannot be eliminated, it is recommended to replace the compressor. When too much refrigerant is added, which leads to too much refrigerant flowing through the evaporator and freezing, it is suggested to let off the excess refrigerant; When air conditioner is used for a long time, it will accumulate certain dust on the evaporator, which will hinder air circulation and reduce heat exchange. If the temperature is too low, it will cause the evaporator to freeze. It is recommended to wipe the evaporator with a towel after the ice melts. When the contact of the temperature control sensor is stuck, the contact is normally closed due to insufficient spring elasticity, and the air conditioner is continuously turned on, resulting in icing, it is recommended to replace the temperature controller.