This is a common problem with most all BMW's it entails the removal of the top of the dash board to remove and replace the blower motor and its components such as the blower motor resistor and the final stage relay, it is so labor intense that anyone working on this job would only do it with the agreement of changing out all three parts...blower motor, final stage relay, and the blower motor resistor, this is definately a very difficult job for any DIYer and can cause more harm then good doing so, I advise using the dealer for this repair or a very reputable European Repair Facility that has ASE Certified BMW Technicians onboard, you may want to get a few second opinions on this however so you can prepare yourself for the job and its expense, unfortunately there is no easy way out with this repair, and it is not a simple fuse replacement.
Good luck to you, sorry I had to be the bearer of this news but when you speak to BMW in the a/m they will pretty much elude to what i am telling you.
Usually the first thing to inspect when the blower fan stops working is the fuses to see if any are blown. Locate the 10A cluster fuse or the 25A HVAC fuse in your car manual, and examine them to determine if they need replacing. The car owner's manual will tell you where to find the fuses that are connected to the heat and/or air conditioning. On the interior fuse panel of the car, a 30 amp fuse is labeled "Heater" or "HVAC."
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