1996 Pontiac Bonneville Owner's Manual - Page 225

If the overheatwarning continues, there's one more thing you can r .You can add the proper coolant ty mix dire'ctlyto the radiator, but b'e sure the cooling system is cool before you do it. I A CAUTION: You can be burnedif you spill coolant on hot engine parts. Coolant contains ethylene glycol and itwill burn if the engine parts arehot enough. Don't spill coolant on a hot engine. When the coolant n the coolant recovery tank at the i is FULL COLD mark, start your vehicle. I Steam and scalding liquids from a hot cooling system can blow out and burn you badly. They are under pressure, and if you turn the radiator pressure cap even a little they can come out at high speed, Never turn the capwhen the cooling system, including theradiator pressure cap, is hot. Wait for the cooling system and radiator pressure cap to cool if you ever haveto turn the pressurecap. -- -- 5-20