my air on my ZL stops blowing cold air when it gets hot outside.it will go from blowing cold air to blowing hot air air when temps go over 89o.it happened a couple of times in az.and the last 2 days when it was in the 90s here it did the same thing.i was driving not sitting still.my car is at the dealer now.as many complaints as i see here why is it that G.M.has not issued any statement on this so dealers would know what is causing this.
