If you put in a modern condenser, then R134a should work fine. Using R134a in an old style condenser designed for R12 won't give very cold air. I think you will be okay if you install the modern condenser, new hoses, and use a compressor that will handle R134a. This is what I plan to do.

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1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
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