On my caprice I know because it was a police car it used R-12 and it can't be bought in stores. Only mechanics are authorized to carry it!
r-12
It probably had R12 from the factory, this is now banned.There are "Drop in" replacements available.
1994 Chevy lumina freon type
There is only one Freon, and that is R12. R12 Freon came installed in your 1991 Chevy. It may or may not have been changed over to R134 Refrigerant. If not change it over, as the cost of R12 is unbelievably high an is no longer in production.
134 freon
Freon is R12. Your 1997 Chevy uses R134 Refrigerant.
R134a
R134A
134a
R134a
What type of freon does a 1993 cougar use
4L60e