Tuesday, with about 1700 miles on my 2010 4 cylinder Equinox, I got a message on the dash that said "ac off due to high engine temperature". Also, the cooling fans ran at full speed and the temp gauge did not work. The local dealer found a bulletin that detailed this problem to the letter and indicated that the computer was locked up. It required a computer reflash and it appears to have solved the problem completly. Only time will tell if it is a long term fix. I don't have the TSB number and cannot find it on the internet or on any of the forums.