I've suffered fsr problems in e46s and am aware of the symptoms. The fan in the x5 seems fine. No over run or rough running at any speed on the fan settings. Air con has recently given up the ghost but I'm assuming this needs recharging as I heard the hiss noise prior to it going. I'm more convinced that it's linked somehow to the radio/amp. Everything works fine but of the fuse is left in that's when I get problems. Ok it's early to assume this but on the days I've not removed the fuse this week the car started ok. Does the radio or amp have a permanent live? I can't actually see the amp (assuming it's in the boot area) but someone also said of its missing the car won't slee due to searching for this component.