My S-10 became a little warm a few months ago so I took it to a shop that charged the system at my request and added about 1 lb of R134a and some dye.
It was good and cool for about two months then went again. I took it back and they tested it and said the compressor had a leak and needed replaced. The compressor, accunulator, and orifice valve were to be replaced for 900+.
At the suggestion of a sometime mechanic friend I charged the system with a retrofit kit to the proper reading and it was good and cold for about 48 hours then went south again. There is some type of oil around the compressor so I assume its blowing out there.
I am willing to replace the compressor myself as it looks like there is only two bolts holding it on but I must first get the serpentine belt off and I do see the idler pulley but am not real sure how it works. It has a bolt on the front of it: Does it loosen to allow the pulley to pivot or is the bolt tight when you move the pulley?
Second: I can't find the orifice valve and do know that it is very small and necessary to have a new one. I intend to take the auto to an air shop after installing all the parts for evacuation, leakage testing, and recharging.
Sorry for the long message but this repair does look doable and after shelling out 1100 for a new clutch a few months ago I thought I would give it a whirl. Thanks again ...