1997 Buick Regal Owner's Manual - Page 259

4. Fill the radiator with the proper DEX-COOL@ coolant mixture, up to the baseof the filler neck. If you see a stream coolant coming froman air of bleed valve, close the valve. Otherwise, close the valve(s) after the radiator is filled. 6. Then fill the coolant recovery tank tothe COLD mark on the overflow hosein the coolant bottle. 7. Put the cap back on the coolant recoverytank, but leave the radiator pressure cap off. 5. Rinse or wipe any spilled coolant from the engine and the compartment. 5-23