Standard green Ethelyn Glycol, or any type of Global coolant will work. always be sure your coolant mixture is 50/50, 50% water and 50% coolant
Dexcool
The 1999 Saturn engine uses dexcool type coolant. This coolant is different form other types and cannot me mixed with another type.
Green coolant
R134
R134a
regular green stuff
R-134a
The factory coolant is Dexcool. I used the Prestone universal, works with all models type. Seems to be fine.
R12
Regular antifreeze
green
A 50/50 mix of distilled water and Dexcool antifreeze.