I was on the way to work the other day when My AC just quit cooling. It was about 85 outside and I had the climate control set on 68. I was driving down the interstate. It quit cooling for about 15 minutes and then started cooling again. I have been experiencing intermittent issues for over a week now. When I first start the truck, it does not cool. I can roll the windows down and the compressor kicks on and it starts to cool. Does anyone have any ideas before I take it to the dealership?