1998 GMC Safari Owner's Manual - Page 243

6. Start the engine and let it run until you can feel the upper radiator hose getting hot. Watch out the for engine coolingfan. 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 DEX-COOL@coolant mixture 8. Then replace the pressure cap. At any time this procedure if coolant begins to flow out filler neck, reinstall the pressure cap. su Be arrows on the pressure cap line up like this through the filler neck until the level reaches the base of the filler neck. 5-21