What are the reasons for the BMW 5 Series air conditioning not cooling?
2 Answers
BMW 5 Series air conditioning not cooling reasons are as follows: 1. Refrigerant issue: The reason why the car air conditioning is not cooling sometimes is due to problems with the refrigerant in the car air conditioning system. 2. Filter blockage: Sometimes, excessive impurities in the car air conditioning refrigerant and refrigeration oil can cause the filter screen to become clogged, reducing the cooling effect, increasing resistance, and decreasing the flow of refrigerant to the expansion valve, leading to the car air conditioning not cooling. 3. Desiccant saturation: There is a dryer in the car air conditioning refrigeration system, whose main task is to absorb moisture in the refrigerant and prevent excessive moisture in the refrigerant from reducing the cooling capacity. When the desiccant in the dryer is saturated, moisture can no longer be filtered out. 4. Compressor drive belt too loose: Sometimes, the car air conditioning does not cool because the compressor drive belt is too loose, or it may be due to the reduced heat dissipation capacity of the condenser, leading to a decrease in the air conditioning cooling capacity.
I've repaired many BMW 5 Series air conditioning issues. The most common reason for AC not cooling is insufficient refrigerant, likely due to leaks in the piping. Compressor failure is another critical factor - listen for abnormal noises or complete non-operation during startup. Condenser clogging is also frequent, especially during spring when willow catkins block the cooling fins. For electrical faults, check if fuses are blown or relays are damaged, which can cut power to the entire system. BMW's precision climate control system means failed pressure sensors or thermostats can also cause cooling failure. An often-overlooked issue is excessively dirty cabin air filters restricting airflow. I recommend first checking the compressor belt tension under the hood yourself. If that doesn't solve it, professional equipment is needed to test system pressure.
