I have a 2011 F250 crew cab King Ranch package . It has the dual zone climate control. The last couple of months I have had intermittent cooling problems , blower works but no cool air. It may do this once a week or more and then work fine for the next three weeks. Usually when it is not working it will not work for 10 - 45 minutes on average then start cooling. If it is working it wont quit working until I have shut the truck off completely and then start back up. I can cannot get it to do this consistently enough to have the dealership diagnose the problem. They had it for a couple of days and everything checks out while they had it. They checked for codes ,Freon charge, blend boxes and everything checks good. I have the Premium Care Warranty but it doesn't do me any good if they can't diagnose the problem. So unless it goes out completely they say they can't do anything for me. When it acts up I've tried taking it to them and it will start working before I can get there. Any Idea's?