1996 Buick Park Avenue Owner's Manual - Page 233

6. Start the engine and let it run until you can feel the upper radiator hose getting hot. Watch out for the engine fans. 7. By this time the coolant level inside the radiator filler neck may be lower. the level is lower, add If more of the proper mix through the filler neck until the level reaches the base of the filler neck. 8. Then replace the pressure cap. At any time during this procedure if coolant begins toflow out of the filler neck, reinstall the pressure cap. Be sure the arrows on the pressure cap line up like this.