Yes.
R134
THERE IS NO FREON IN A 98 IT IS R134
Freon is R12. Your 1997 Chevy uses R134 Refrigerant.
It does not use Freon as a refrigerant. It uses R134 refrigerant.
R134 .... IS freon.
R134
There is no need to ever change the refrigerant which is R134 and not Freon R12.
They should never be mixed.
It came from the factory charged with R12 Freon. As this refrigerant is extremely expensive and hard to find, I suggest you convert it over to R134 Refrigerant.
1993-95 for most.
R134
R134