What are the reasons for BMW air conditioning not cooling?
2 Answers
Here are the reasons why BMW air conditioning is not cooling: 1. Lack of 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 fault in the air conditioning system wiring harness. Additional information: The air conditioning system mainly works by the compressor compressing the gaseous refrigerant into a high-temperature and high-pressure gas, which then flows through the pipeline into the condenser. In the condenser, it is cooled by the radiator fan and condenses into a high-pressure liquid refrigerant. The high-pressure liquid refrigerant flows through the pipeline into the dryer reservoir, where it is dried and filtered before entering the expansion valve for throttling. In the evaporator, it absorbs the heat from the air flowing through the evaporator, lowering the air temperature and blowing out cold air, thereby producing a cooling effect.
As a seasoned BMW owner with over a decade of driving experience, I've encountered air conditioning failures multiple times. The most common issue is refrigerant leakage—slow leaks caused by aging pipes or damaged seals gradually diminish cooling effectiveness. BMW's electronically controlled compressors have a high failure rate and may occasionally seize up. When the condenser gets clogged with dust and debris, heat dissipation suffers, resulting in weak air conditioning. Excessive dust buildup in cabin air filters obstructs airflow and reduces cooling efficiency. Once on the highway, my AC suddenly stopped working; inspection revealed a blown fuse, which was easily fixed with a replacement. Given BMW's precision engineering, never attempt DIY repairs—always visit an authorized dealership for professional diagnostics. Summer driving safety comes first.
