Thanks for all the info and help. Here is a little more detail in the problem. The clutch is engaging then disengaging sporadically about every few seconds and if I let it run for a several minutes, it starts to smell like burnt clutch. The air coming out of the vents at first is cool, not cold. The truck was converted to the new stuff in 2000 when the compressor was changed out (40,000 miles and 9 years ago). I do not have any other doc’s on if and when it was serviced after that. I will head over to Checker Auto and maybe Harbor Freight to get some gauges and some freon.
I'd say it's likely that the filter is likely clogged. it could also be a bad oraphice (sp?) valve. the filter is that in-line filter between the compressor and the condenser.
yeah my ways of doing it are a bit redneck, but my philosophy towards a lot of this kind of thing is, if you make it into too big of a job, requiring a bunch of tools you don't have, it'll never get done. i for one know none of my vehicles would have working A/C if i had to buy a bunch of expensive gauges and other equipment to do it, or if i had to take it to a shop and pay a bunch. i also don't evacuate the air from the system after assembly, i know i know, not kosher. at idle, on a hot day, the A/C pump will usually run constantly with the fan on high, if it's fully charged. at least it does for me. when the rpm increases the pump will begin to cycle.
my a/c is ice cold even when it's 100+ here (which is often in this valley) and it seems to keep working. yeah, it's not the right way to do it but it works. i'm just saying, that if/when it comes to either abandoning you're a/c system for lack of available tools to do it "right" or doing it my way, you might as well give it a shot. most of the people who have non working a/c probably could have it working easily if were willing to try it my way. instead no a/c
if you have access to the gauges, or are willing to buy them, then use them.. it's the way to go... if not, i'd change the filter and the oraphice valve and recharge it.