But I've been working on it for years and reading the manuals, taking classes & listening to the AC guys etc. .

They all say to only pull 20" or so vacuum for 30 min. to one hour as the water vapor boils quickly under I forget how many inches then it pulls out so you needn't run the vacuum pump for hours like most shops I know do .

Then leave the gauges connected for at least one hour to ensure no leaks before re-charging with your choice of refrigerant .

I'm still using R-12 as it -is- available if you hunt a bit , not too expen$ive either .

I am told the green O-Rings made for Japanese cars will resist R-12 or R-134a and are sold very cheaply by most FLAPS .

I have a kit of various size green O-Rings for the next time I replace a compressor , I'm trying to wait until I have sufficient $ to overhaul the engine first but AC is a must for us old farts and once running , the totally clapped out engine actually runs well and summer is nearly here so.....

__________________
-Nate
1982 240D 408,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better