[W126 Coupe] A/C Question About R12 & R134

[Michael de Holl]

Just got my 91 SEC back from a trusted Mercedes specialist independent shop for an A\C charge. He said the car needed a partial charge and the temp now at the vent was 42 degrees. On the paper work it says he used R134A refrigerant. As far as I know my system is still R12. There are no tags or decals saying anything different. Can you put R134 into a R12 system? What damage can this cause? Its the weekend so I can't verify what he put in until Monday. Any suggestions?
Mike
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