I've had by 2007 GMC Acadia since Nov 2009 and had no problems up until yesterday. I drove about 70 miles with everything working normally. Shut the vehicle off for a few hours. When I started the car up again everything seemed ok. I begin to drive it then a ll of a sudden there was a high pitch noise from the radio. I just figured there was something wrong with the radio and that the station had went out since I had no sound, so I switched radio stations and still had no sound. Then I noticed that I had no sound coming from the turn signals either. I made my trip back home (the 70 miles) with no sound coming from either the radio or turn signals. This morning I started the vehicle up and the radio seemed to be working along the signals. But when I started it again a few hours later, no sound. Does anyone have this same problem or have a fix for it.