What Causes BMW Air Conditioning to Freeze?

[McSawyer]

Reasons for car air conditioning freezing include pressure issues, filter blockage, and temperature control problems. Causes of freezing: The expansion valve's adjustment is too small, resulting in excessively low low-pressure; insufficient refrigerant in the system leads to low evaporation pressure; the internal circulation filter is blocked; the temperature control (or temperature sensor) fails, causing the compressor to run continuously; the energy control valve (pressure regulating valve) of the variable displacement compressor fails, keeping the compressor operating at full capacity, which results in excessively low low-pressure and evaporator frosting. Solutions for air conditioning freezing: First, clean the air conditioning system thoroughly before use, and check the sealing condition. Poor sealing cannot be compensated by adding refrigerant, so pay attention to regular maintenance. Also, the air conditioning needs periodic rest, so avoid using it for too long. After using the air conditioning for a while, turn it off and open the window for ventilation.