1993 190e 2.6
Wife's AC is defunct and I suspect it needs a recharge. I have both R12 (couple #s left in the #30 bottle) and R134a but am reluctant to add any freon until I'm certain what the car came with and I assume still uses. (sorry I misspoke saying R22 earlier)

Years back I took my previous 1989 MB to local A/C guy who charged $400 for a recharge and the compresser quit on the way home - ink on the check hadn't dried but no warranty or guilt. Dealer then charged $700 to make it right. Obviously I won't take another car to him/them.

I know that 1992-3 was crossover year for US cars but would MB have already switched to R134a?

Also, I can only find one Schrader valve, low side I think. Where is the other one hidden? I've got good pressure on that side and it surges appropriatly but without seeing the high side, I'm only guessing that it need another pound or more of freon.

Tks.

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1993 MB190e 104k