I would be going down the road, heater would come on and I could not get the heater to go off or air would come on for not reason. Dealership could not "create the problem" this is their favorite comment. Told me no recall on heater system , but needed to run cool air to see if it messed up there was a recall on the cooling system. They said they new it was cold weather and not convenient to run air but the warrant mileage was about to expire on the cooling system recall, if mileage went over then I would have to pay for repair. This is my last GMC.