What Causes the BMW 5 Series Air Conditioning to Not Cool?

[OBriella]

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.

[StAlexa]

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.

[BethanyLee]

Air conditioning not cooling is a common issue, and I've repaired many cars including the BMW 5 Series. First, check if the refrigerant level is sufficient—if the Freon has leaked, low levels will result in no cooling effect. The compressor might be faulty; if its internal valves are damaged or not working, the entire system fails. Another possibility is a clogged condenser, where external dirt prevents heat dissipation, and the fan might not spin. Electrical components like blown fuses or faulty sensors should also be inspected, especially since BMW's electronic controls can be quite sensitive. Quick diagnosis method: Turn on the AC and listen for sounds—if there's no humming noise, the compressor might be the issue. If airflow is weak, check the filter. It's best to visit a professional shop for leak detection with specialized tools, rather than making minor fixes that could affect the entire vehicle.

[NoraLee]

The BMW 5 Series air conditioning not cooling is usually due to insufficient refrigerant, with system leaks commonly occurring in the pipes or connections. Compressor failure is another major cause; if it makes little noise while working, there's no cooling. A non-functioning fan can also lead to overheating, and a clogged condenser poses an even bigger issue. For a simple check: ensure the filter is clean and unblocked, then inspect the fuses and relays, as they are prone to burning out and causing power failure. It's advisable to visit a repair shop promptly to avoid affecting driving visibility.