Strange Fan-like noise while driving
I have a 2004 Jeep Rubicon, 4.0. I have this really strange noise that only happens when I'm driving down the road. It sounds almost like a fan hitting something or something is being hit - not a heavy knocking sound or anything like that. The noise only happens when I'm driving, not at idle, or when I race the engine, engage/disengage the clutch, it's not the heater/ac fan - what else is rotating only while moving?? oh and it's not the brakes, tried to find a correlation between that too, but no luck. Thanks in advance for any advice/suggestions! ps: it could also be described as a fast "clicking sound" but again, it stops when the jeep stops.