Thanks for all your replies. Just wanted to clarify that after driving I checked the aux fan while the car was stopped in the garage with no air blowing into it. I then turned off the AC and the Aux fan stopped and turning it AC back on started the aux fan again. This was done when the car was stationary. Also someone had mentioned that I could test the Aux fan with test tools? I have INPA, will that help test?

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06 X5 3.0i