My 2008 Chrysler Aspen is making a thumping/clicking noise. on 2008 Chrysler Aspen

The noise seems to be from the rear fan (3rd seat area). It even clicks when the car is not in motion (not running/no key). At first I thought it was only when I was trying to cool the back of the vehicle but now that the weather is cold, the noise comes and go even when trying to heat.

Asked by for the 2008 Chrysler Aspen