The passenger side of the dashboard on my 2000 Grand Caravan makes an intermittent whirring noise. It sounds like a servo motor trying to find a proper position. When I say "intermittent", I mean most of the time but not all of the time. From a bit of experimentation, I'm guessing that there really is a motor that controls the route of the air from the heater based upon (?) the position of the mode selection dial. But somehow I doubt it's supposed to run on and on (back and forth?) like this.
There is also an occassional "pop" noise that may or may not be associated with the whir.
Any ideas about exactly what's going on and what should/can be done about it?
JGM