I have a 2012 Platinum 4x4 ecoboost. When the truck is stopped, at a red light (long) or sitting in park, the A/C will freeze you out of the truck. When driving, it still blows just warm air. When stopped it starts blowing cold again. Sometimes, while driving it will continue to blow cold air for long periods of time and short period of times. Any help or advise would be greatly appreciated.