I am going to assume it is R12 because the car is pretty much fully original. I have been meaning to take some pictures of the car anyway, so will post what I see and report back.

But if I have this right, a pressure test is first as the AC clutch won't engage if the system is empty? Thanks.

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1982 240D (4-speed)
1988 Volvo 240DL (5-speed wagon)
1999 Volvo V70
2002 Volvo XC70 (the grocery getter)