You have a bad heater control valve, part number 64 12 8 374 995 or the auxilary water pump is dead, part number 64 11 6 913 489

Number 1 or 17 in this link. I have never seen a bad auxiliary pump so go to the valve first, I'll bet it's stuck closed.

http://www.realoem.com/bmw/showparts...16&hg=64&fg=18

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