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You need to purchase a hand vacuum pump with a guage to trouble shoot the vacuum system. Mighty Vac or similar. The plastic ones are a poor investment but will get you by for awhile. I bought my last brass one on sale at the local Sears.
R12 can still be purchased but it is costly. IMHO it's worth the extra cost as it cools much better in the W123 system.
Use the google forum search tool and do some reading. Most of the questions you will have are already answered in great detail. Also look at the DIY pages on this forum for the repair issue.
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