2003 Pontiac Bonneville Owner's Manual - Page 294

If the overheat warning continues, there's one more thing you can try. You can add the proper coolant mixture directly to the radiator, but be sure the cooling system is cool before you do it. Steam and scalding liquids from a hot cooling system can blow out and burn you badly. They are under pressure, and if youturn the radiator pressure cap -- even a little they can come out at high speed. Never turn the cap when the cooling system, including the radiator pressure cap, is hot. Wait for the cooling system and radiator pressure cap to cool if you ever have to turn the pressure cap. -- 5-35