What are the reasons for the BMW 3 Series air conditioning not cooling?

[LaLeilani]

First, check the refrigeration cycle system of the air conditioning to see if there is any gas leakage, blockage by foreign objects, or the need to add refrigerant. If the air conditioning is not cooling, the initial step is to inspect whether any components of the air conditioning system are blocked, as obstructions in the filter, condenser, or refrigerant lines can reduce the cooling efficiency. Below are the reasons why BMW air conditioning may not cool: 1. Insufficient refrigerant in the air conditioning system / The refrigerant pressure switch detects low pressure or the pressure switch is faulty. 2. Air conditioning compressor failure; 3. Air conditioning control unit failure; 4. Air conditioning function switch failure; 5. Open/short circuit in the air conditioning system wiring harness;