duceyduce

Actually doesn't seem too vexing my brother. When you are at idle, you are not producing as much pressure as when you are accelerating. So if your freon levels are low, then when you idle you very well may not get any cold air through the vent. As A/C runs like a giant circle of pressure, you need to make sure all the levels are sustained at all times. Before diving into a fan clutch, cycle switch, etc. I would just simply try to evacuate and recharge the system, and I am willing to be that it takes care of the problem. Just run to your local auto parts store, find a few bottles of R-134A, and load them up into the system through the low-side fitting. The fittings will be located in the upper-left hand corner of the engine compartment (if you're looking INTO the compartment) coming off of the condensor. The low side will be a smaller fitting than the high side, and normally it's the closest one in-line to the condensor. Start with about a full can of freon, and check to see how it feels. After that, use half a can at a time to be certain you don't overcharge the system. Might want to pick up some UV Dye as well, so in about a week you can run a black light over the truck to identify any leaks. Hope this helps brotha, and that it's something simple like this and not something serious. Have a good one!