Sorry to differ, but I'm getting further and further away from liking R134 conversions. In these cars most of the cost is usually in the actual repair, evaporator, compressor, etc. You'll be better off to fix the leak, ensure that you've fixed the leak, then put the R12 in it.

Just my $0.02 from my experiences in changing over a few. It's a one way street, if you want to go back to R12, you really can't do it, the system is contaminated with R134, you have to stick with it.

Best of luck,

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Larry Bible
'84 Euro 240D, 523K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles