R134a
R-12 from factory Should be converted to R134
r 12 its no longer available so a conversion kit and system flush are needed. $100
R134a
r134
most likely it is freon. your best bet is to convert it over to 134 a
r-134a
r 134a
R134
R-134 should be the refrigerant as R12 was banned in 1996.
It takes r134a refrigerant.
Freon is R12. Your 1997 Chevy uses R134 Refrigerant.