whirring dashboard (2000 GC)

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

 

Do you have auto climate control?

 

Nope, just the standard manual control (I think it's the standard, anyway --
not the deluxe set-a-thermostat control).

JGM

 

if the windows fog up easy inside i would look at the recirc motor.
did you have a windshild replaced???
there was a tsb for wind noise from behind the dash on 99 models if i remember
correctly

 

Haven't noticed any issues with fogging. The windshield was replaced last
year but this doesn't seem like wind noise, it's unrelated to speed. Where is
the recirc motor and what should it do / not do?

Any other thoughts?

JGM