hmm... did you let it hold the vacuum to check for leaks? if you changed the dryer and expansion tube and it is full of freon you might have a faulty compressora couple of weeks ago i changed the filter in the expansion chamber and then put a pump on and sucked it down the charged it????
the trucks vacuum pump wont have anything to do with the ac blowing cold..I have chnged vacuum pump and no leaks maybe the freeon is low
I just talked to one of my dads truck mechanics. He said there is a switch that is known to get hung up. The switch is what kicks the compressor in. so im gonna try that out. He said if the compressor is faulty it probably would be cold at all.
the clutch is getting hot and not pulling in to engage it.. I had this issue with my 99 at work.. if ya rev it up it would engage from the added vibration.. while its not engaged idling if you take a piece of wood and push the clutch in it will grab likely... magnet is weak or air gap is to large