The AC in the X5 is cooling great and observe no issue with the compressor. But their is an issue with Aux Fan running like a Jet Engine whenever AC crystal button is turned ON.
I think something is sending a wrong signal to Fan to run High when AC is ON. This could be the DME or whatever controls the communication. There is a history to it.

Last year my AC was not cooling, so I tried filling up the 134+ myself. Just after the fill up my Condenser leaks and all the freon leaks and Fan started running high. So took the car to an indy bmw and put in a new Condenser and pull all the freon and fill it up again. AC start working again but observe that Fan runs high when AC is ON. Told the Indy shop and he ran a code check last year and told me its due to faulty rain sensor. I couldn't believe what he said so just let it go. Now seeing the AC fault made me think something is wrong with AC module or some sensor which is causing this Fan running high and the fault code. Also called the BMW Dealer and left a message but he hasn't call back yet. Hope its something simple between DME and AC or some sensor. Already replace the coolant sensor few days back but that didn't help.