Any new input on this issue? I have noticed that mine does the same exact thing. When idling with the fan on there is a humming noise and you can almost feel a small vibration as well. Turn the fan off and the noise goes away. I am about to be out of warranty and want to take it to the stealer if it is an issue that they will take care of. I just don't want to make an appt drive down there, get a rental and waste my time if the majority dealers are pretending it is normal. What do you think my odds are on getting them to do anything about it?