John,
The cooling fan for the radio always runs with the key on if the radio is on or not. I don't know if that is your noise but don't discount it because the radio is off.
D-
John,
There are a couple things in the dash that could be doing that. There are a couple servos that do the mode switching in the heater box and there is a small cooling fan that is mounted above the radio. Also there is a normal sort of a momentary motor kind of sound that you get every...