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Less is more. 134a is more sensitive to overcharging than r-12, so you really need to be careful and very slow. Use real gauges, watch high and low sides, and use a sensitive digital thermometer to keep watching temps drop. As soon as they gonzo one degree, stop.
Use a giant pusher fan to keep the condenser working at a steady rate.
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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (113k)
1991 350SD (206k)
1991 300D (228k)
1993 300SD (291k)
1993 300D 2.5T (338k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (265k)
Past Diesels:
1983 300D (228K)
1985 300D (233K)
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