1994 GMC Suburban Owner's Manual - Page 222

6. Start the engine and let itrun until you can feel the upper radiator hose getting hot. Watch out for the engine fan(s). 7. 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. 8. Then replace the pressure cap. At any time during this procedure if coolant begins to flow out of the filler neck, reinstall the pressure cap. Be sure the arrows on pressure cap line up like this. Cooling System -Diesel Engines When you decide it's safe to lift the hood, here's what you'll see: ..$.?A. . _ ." .. A. Coolant surge tank pressure cap B . Engine fan( s) C. Radiator 5-18