1993 Pontiac Bonneville Owner's Manual - Page 207

Problems on the Road i '. 'k I Engine Overheating (CONT.) Steam and scalding liquids From a hot cooling system can 3w out and burn you badly. They ale under pressure, and if you turn thl= radiator pressure cap-even a tle-they can come out at high eed. Never turn the pressure 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. I \ I How to Add Coolant to the Radiator: 2. Then keep turning the pressure cap, but now push down as you turn it. 1. You can remove the radiator pressure Remove the pressure cap. cap when the cooling system, including the radiator pressure cap and upper radiator hose, is no longer hot. Turn the pressure cap slowly to the left until it first stops. (Don't press down while turning the pressure cap.) If you hear a hiss, wait for that to stop. A hiss means there is still some pressure left.