After reading some more, looks like I'll have to rebuild the compressor with the kit the guy from UK sells.
If memory serves me well, a few months back the accumulator pressure was 9.8 bar, which might be low for the system to work properly;
on top of that, its been a few months with a leaky bag, until now, so the seal should be pretty worn out...

ill just replace that and report back.

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2006 X5 4.8is LeMans Blue / creambeige interior
Prod.date: 2006-06-21