First of all I am wondering where the dryer and expansion valve are located?
My car has had several compressors replaced in it's history. It is time to resurect the a/c again. I have been told that I need a compressor, expansion valve, and drier. This car has been converted to R-134a in the past. I am wondering if it makes since to convert back to R-12 or stay with R-134a?
I do not want to have to do this again. So I want to do it all right this time. But of course I need to do this in the most cost effective manor. Thank-you

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1985 Mercedes Benz 300SD, TMU
2015 Chrysler 200S