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One of the things the little compressor powered pumps are good for is to be able to pull enough vacuum to check and see if there are any leaks after doing service work. After you change out the ac compressor and other parts,pump it down to 29 in-Hg ( checked with a good set of manifold gauges) and see if it holds for a few hours. If it does, great. You could then take it to a shop and have them deep vacuum and charge, or just deep vacuum if you would want to charge it yourself.
If it doesn't hold ,charge a can of UV dyed 134.Then get a cheap black light and glasses, find the leak and fix.
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Gary Gilliam Sumerduck VA, '94 940 na Regina 150k, '86 240 180k
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