Don't automatically assume that you have to change to R-134. I have kept my system on the original R-12 as it isn't that much more expensive and the old system works better with R-12 than with R-134. If I had to replace the compressor, I might then make the switch but you need to replace several other things, too.

If I knew how, I'd do a poll
(a) Still using R-12
(b) Converted to R-134
(c) A/C doesn't work

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970