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What Causes a BMW 5 Series Air Conditioner to Blow Hot Air Instead of Cooling?

2 Answers

PeterMarie

07/25/25 4:31am

When a BMW 5 Series air conditioner fails to cool and blows hot air, it may be due to an air conditioning malfunction. Below are specific reasons and solutions: 1. Specific Reason: Excessive refrigerant can cause insufficient cooling. The proportion of refrigerant in the air conditioning system must meet certain requirements. If the proportion is too high, it can affect heat dissipation—more heat dissipation means greater cooling capacity, and vice versa. Similarly, adding too much cooling oil during maintenance can also reduce the heat dissipation of the refrigeration system. 2. Solution: If no bubbles are visible in the sight glass when the car air conditioner is running, and no bubbles appear after the compressor stops, it is definitely due to excessive refrigerant. In this case, simply drain some of the refrigerant.

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LaLevi

08/10/25 5:25pm

I also encountered the issue of the air conditioning not cooling but only blowing hot air when driving my BMW 5 Series, which was really uncomfortable, especially during summer drives. There could be several reasons for this, with the most common being insufficient refrigerant or a leak, which prevents the system from properly cooling the air. Compressor failure is another critical point—if it doesn't start, the refrigeration cycle is interrupted. Additionally, if the condenser or radiator is clogged with dust, the cooling efficiency drops, and the compressor might shut down to protect itself. A faulty control module can also misjudge the temperature, leading to heating only. Problems with the fan or belt might also affect cooling. I recommend starting with simple checks, like confirming whether the AC mode is set correctly and ensuring it's not accidentally set to heating mode. It's also worth checking if a fuse has blown. Ignoring these issues can compromise driving safety, as high temperatures can easily lead to driver fatigue. I took my car to a repair shop, where they used diagnostic equipment and fixed the issue by refilling the refrigerant. Regular AC maintenance is crucial—cleaning the condenser once a year before summer can help prevent such problems.

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