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Mark:
You should be in the neighborhood of 35-40 PSI low (suction) pressure, and around 160 PSI high side. This depends on cabin temp and ambient temp. Also assumes R-12 as the working fluid. Sounds like you can get away cheap on this one, and not need to completely overhaul your system.
FWIW, cars are the worst leakers of refrigerant ever. Historically, they all leak eventually.
Pat
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Patrick E. Keefe
78 SC
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