1995 Buick Regal Owner's Manual - Page 196

Fill the radiator with the proper mix, up to the base of the filler neck. If you see a stream of coolant coming horn an air bleed valve, close the valve. Otherwise, close the valve(s) after the radiator is filled. 5. Rinse or wipe any spilled coolant from the engine and compartment. 6. Then fill the coolant recovery tank to the COLD mark. 7. Put the cap back on the coolant recovery tank, but leave the radiator pressure cap off.