It depends on the compressor. The front seal likes to leak, especially on the R-4 design.

Look for oil/dirt residue on all the connections. I ended up buying a new compressor last year. The rebuilt just lasted a week past it's one year warranty. Get a Hodyon (Hancock Industries) compressor. If you are going w/R134 again, get the thick GM specified oil or BG Fridgiquiet.

Holding vacuum is different than holding pressure, so no guarantees. Plus you need to use a good pump to get to 29" IIRC, anything less then 24" does not extract all the moisture.

__________________
RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Gone and still missed...1982 w123 300D, 1991 w124 300D