r134a
r134
R134
R134....But to be sure, lift the hood and there should be a sticker telling you what type of refrigerant to use.
Freon is R12. Your 1997 Chevy uses R134 Refrigerant.
R-12 from factory Should be converted to R134
most likely r134-a if it has screw on connections it would be r-12
R134
r134
r134
r134
R134-a
r134