1993 Buick Regal Owner's Manual - Page 202

I. 1 8. By this time the coolant level inside the radiator filler neck may be lower. If the level is lower, add more of the proper mix through the filler neck until the level reaches the base of the filler neck. w ...L . 9. Then replace the ' . pressure cap. Be sure thearrows on the pressure cap line up like this. 7. Start the engine and let it run until you can feel the upper radiator hose getting hot.Watch out for the engine fan(s). 200 . -