What are the reasons for the BMW X5 air conditioning not cooling?

[DePresley]

Here are the reasons why the car air conditioning is not cooling: 1. Lack of refrigerant. 2. Dirty condenser. 3. Damaged air conditioning compressor, throttle valve, or expansion valve. 4. Belt aging or looseness, among other reasons. Additional information: 1. Lack of refrigerant: Car air conditioning usually needs refrigerant replenishment every 2~3 years. Even if the air conditioning is tightly sealed, refrigerant can still escape, especially if there are minor leaks in the air conditioning pipes or condenser. 2. Dirty condenser: Dirt on the condenser can cause the engine temperature to rise too high or poor air conditioning performance. 3. Damaged air conditioning compressor, throttle valve, or expansion valve: Malfunctions in the expansion valve and throttle valve directly lead to poor air conditioning performance. 4. Belt aging or looseness: This can cause belt breakage, belt noise, loss of power assistance, etc.

[ValerieLynn]

I've been driving a BMW X5 for several years and have encountered the issue of the air conditioning not cooling a few times. It's usually caused by insufficient refrigerant. Refrigerant is like the cooling blood of a car; if there's not enough, the cooling effect drops significantly. This could be due to a minor leak in the system, such as loose pipe connections or a damaged condenser. Another common issue is a faulty compressor, which hums near the engine. If it stops working, the cold air disappears. Problems like a clogged expansion valve or electrical issues, such as a non-functioning fan, blown fuse, or faulty temperature sensor, also need to be checked. I remember one summer when the AC suddenly stopped working, and the car felt like a steamer. I quickly rolled down the windows for ventilation and drove to a repair shop, where they confirmed the refrigerant had completely leaked out. If you face a similar situation, I recommend first checking the cabin air filter. If it's not clogged, try adding refrigerant, but it's best not to tamper with it yourself—BMW's electronic systems are complex, so it's safer to let professionals handle it. During regular maintenance, remind the technician to inspect the AC components to prevent many potential issues.