On a recent 10 hour drive this summer in my Enclave, I noticed the front AC vents were not delivering the normal air flow about 4-5 hours into the trip. My wife and I were starting to sweat. We did not have the rear "aux" system turned on. We tried taking the system off "auto", turning up the fan motor, turning system off to rest it, etc etc, but nothing worked. We ended up cranking the rear aux system (which was working) to lower the temps and make the rest of the trip somewhat bearable. The next day the front AC worked fine on short twips around town so I know we are not low on freon or anything. On the return trip home, same problem. No front AC after about 4-5 hours of driving in hot weather. Called dealer's service dept who said he had never heard of this problem, but admitted the Enclave does have a series of odd things breaking down.
Anyone else experience this? Any suggestions before I take it in to be looked at and lose my car for a day or two?