I am working on the air conditioning in my roommate's 1991 W126 350SDL. It has a factory-looking parallel-flow condenser in it, and will get a brand-new compressor labeled for use with R134a, as well as all new hoses and drier.

Will the stock R12 expansion valve work with the R134a? Or is there a better expansion valve to use? I thought I read somewhere that R12 and R134a expansion valves are different.

Thanks. I'm hoping to install all the parts this weekend and have it ready to be charged at a shop.

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1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles