The only info we have is that there is refrigerant in the system and the compressor wont engage. There are lots of reasons that could be...simple things like blown fuses (that can be caused by not-so-simple problems), the compressor itself, system/vehicle shared sensors, system ECU, related vehicle systems like the engine cooling fan, and so on.
As mentioned, getting it scanned with a BMW-specific scanner will go a long way in narrowing it down some.
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04 X5 3.0i auto
03 X5 4.6is
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