The other day I was up in the mountains and when I turned off my car and came back to it the A/C went out. The light for the A/C was reset to the off position and when I turned it on all I got was very hot air. It is as if the temperature setting is stuck at the hottest level. I am not sure which fuse would control this problem. Anyone have any ideas?

Isn't the truck still under warranty?

My approach would be to, first, take a test light or multimeter and test all under-dash and under-hood fuses. It should only take several minutes. Second, look for an A/C relay. It could be in the under-dash fuse box or under the hood. Test for power going to and from it. Third, I would start testing for power, with a multimeter, in the A/C circuit to the compressor. You really need to find an A/C circuit diagram (try a Haynes Manual) for your particular truck.