1993 Oldsmobile Silhouette Owner's Manual - Page 201

I A Adding only plain waterto your cooling system can be dangerous. Plain water, or some other liquid like alcohol, can boil before the proper coolant mix will. Your vehicle's coolant warning system is set forthe proper coolant mix. With plain water or the wrong mix, your engine could get too hot but you wouldn't get the overheat warning. Your engine could catch fire and you or others could be burned. Use a 50/50 mix of clean water and a proper antifreeze. , w r can . and crack the engine, radial heater core and other parts. In cold-weatl You can be burned if you spill coolant on hotengine parts. Coolant contains ethylene glycol and it will burnif the engine parts are hot enough. Don't spill coolant I on a hot engine. ',A When the coolant in the coolant recovery tank is at or above the FULL HOT mark, start your vehicle. If the overheat warningcontinues, there's one more thing you can try. You can add the proper coolant mix directly to the radiator, but besure the cooling system is cool before you do it. 199