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There are tools designed to replace shrader valves without evacuating the sytem. I own one for R-12 systems. Don't know on a R134a...
Most ppl think the R134a convereded W123's don't perform nearly as well as the R-12 cars. You will want to rely the fan to run whenever the compressor is engaged.
Michael
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Michael McGuire
83 300d
01 vw A4 TDI
66 Chevy Corsa
68 GMC V6 w/oD
86 300E
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