1994 Cadillac Fleetwood Owner's Manual - Page 243

4. With the coolant I surge tank pressure cap off, start theengine and let it run until you can feelthe upper radiator hose getting hot. Watch out for the engine fan(s). By this time, the coolant level insidethe coolant surge tank may be add lower. If the level is lower, more of the propermix to the coolant surge tank until the level reaches 5. Then replace the pressure cap. Be sure thepressure cap is tight. 230