Over the weekend we were doing some mountain traveling and were experiencing some problems with our 2008 GMC Acadia. We were towing our 4,000 lb. camper to the mountains, as we were ascending the Acadia started to overheat and eventually shut down. We pulled off to the side and let the car sit for a few minutes. We tried to start the car and it would immediately shut off. We waited a little longer and the car cooled down and we were able to make it to the top, however, the cars temperature was still above the norm of 210. On flat ground the car ran great, but as we started to ascend again on the way back the car started to overheat. Has any one had this problem or know what could help next time i go up the mountain?