[njk53]

What are the vent discharge temperatures at idle? Going down the road?
Your truck has a viscous type fan clutch that really doesn't move a lot of air through your heat exchangers like an electric fan would. So, your discharge temps will be high @ idle. This was always a problem with a viscous type clutch. Any way, make sure the fan clutch is good. If it is good, make sure you have the correct amount of refrigerant in the system. Too much refrigerant and/or PAG oil will degrade A/C performance.