I was going to say you have the same issue as me, a variable valve compressor, but looks like you have a pre-facelift? I thought they only put that garbage on our facelift X5s. Does it kick in if you rev the engine? Does your compressor turn while not blowing cold (meaning always)?

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2000 e39 M5 Titanium on Black
2006 e53 M54 Titanium on Black
2007 e83 Black on Black Sport pkg
2004 Avalanche 2500 lifted 4.88 gears
1994 jacked up Jeep
1987 GMC lifted short bed on tons