Most all cars of that year and later use the orange extended life coolant . it is used for the newer aluminum block engines and is good for 50000 miles
The 1997 Saturn used dexcool antifreeze. The chemical compounds are different and should never be mixed, as the engine will no longer cool properly.
R134a
Dexcool
Anti-freeze that is compatible with aluminium engines.
Autozone/ advanced auto usually has antifreeze that goes with either kind. I suggest that.
Any type of antifreeze will work in a 99 Saturn SL1. Many people recommend using Prestone Antifreeze for cars that are older than ten years.
Green
Green
GreenGreen
Green.
Dexcool ORANGE in color.
Dexcool don't use any other type