It's probably the climate control system sampling the air to get a temperature reading. The pump is behind the glove box and it pulls air through the little black nub next to the rear-view mirror.
You can put your ear up to it and verify this.
As you've read, be VERY careful with the GP's! It's a great car, enjoy it!
__________________
-Evan
Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63
Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250
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