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I'm having the same problem with cool air only on passenger side. I had an 2004 X3 that did the same; I added more coolant and it worked. I now have a 2007 X3 that started to do the same. The pressure was full, I didn't want to overcharge, so I released enough pressure and added new refrigerant. Now it's not blowing cold at all. There are no leaks and the compressor is working. Can anyone advise? If the Air Quality Sensor is out; could that cause this problem?
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