Before throwing $400 on a fan and another $400 to have it installed you can get the DME module scanned to see if a fan fault shows up. You will need to get a BMW scanner or go to a shop that has a BMW specific scanner. A generic scanner may not be able to show the fan fault.

Although you are a BMWNewbie and don't contribute a lot to this forum, it would be helpful if the advice that members provided to you helps you resolve the problem that you should post afterward what solved the problem. For a forum such as this to be helpful to everyone solutions to problems should be posted.

I see many of your past posts are about problems that you are having with the X and people are providing advice but no resolution to the problem. Are you just driving the X without fixing the problems?