What Causes the BMW 5 Series Air Conditioning to Not Cool?
2 Answers
The main reasons why the BMW 5 Series air conditioning does not cool include: lack of refrigerant; damaged air conditioning flaps making it difficult to cool; excessively dirty condenser; damaged air conditioning compressor, throttle valve, or expansion valve; aging or loose belts, etc. Here are the details: 1. Solutions: Add refrigerant from the low-pressure side; release some refrigerant from the maintenance port on the low-pressure side of the air conditioning system; tighten the air conditioning compressor drive belt; replace qualified refrigerant and refrigeration oil; replace the compressor. Remove the installed GPS and test the air conditioning to see if it still does not cool. 2. Inspection: First, use a gauge to measure. The static pressure is about 5bar, which is normal. Use a computer diagnostic plan to check the power supply voltage of the electromagnetic clutch. The multimeter measurement result is 12V, which is normal. Then, measure the resistance of the compressor electromagnetic clutch. The result is infinite, while the normal resistance range for an electromagnetic clutch is 2.5-15 ohms. This exceeds the normal range, indicating that the compressor is damaged.
The air conditioning suddenly stopped blowing cold air while driving, and I've encountered this several times in my BMW 5 Series. It's really unbearable. The most common reason for the AC not cooling is a refrigerant leak—when the liquid used in the car runs out, the pressure drops, and it gets hot. Another issue could be the compressor, which works near the engine; if it fails, the entire system shuts down. Or, the fan might not be spinning, preventing hot air from dissipating. Check the AC filter—if it's clogged with dust, cold air won't flow in. Additionally, small components like fuses and relays can burn out, cutting off the electrical current after starting the car. My advice is to pull over, inspect the filter and fuse box first. If you can't fix it, head to the dealership immediately—don't delay in summer heat, as it affects driving safety. Regular maintenance should include cleaning the AC system.
