R134
134 a
A 1998 Buick would use R134a refrigerant.
1998 Buicks use R134a freon.. Widely available at any auto parts store or Wal-mart
R134a
R134a
R134a
134a
R134a
134
R-134
R134a
It came with R12 Freon. As R12 is cost prohibitive, have the unit converted to R134a refrigerant or a similar substitute.