Ok - this is an odd one. I have an 03 Yukon SLT - and there's a small speaker grille (perhaps for a microphone?) above my head in the headliner. Everytime I start the truck up when it's cold - it sounds like a little motor is whirring away behind that little grille. Its actually a little loud. Then after the truck is warmed up - it goes away. The rear heat or a/c is off and i dont use on star or the phone option.
Any clues?
Any clues?