2003 Pontiac Grand Prix Owner's Manual - Page 264
2003 Pontiac Grand Prix Manual
Page 264 highlights
Adding only plain water to your cooling system can be dangerous. Plain water, or some other liquid such as alcohol, can boil before the proper coolant mixture will. Your vehicle's coolant warning system is set for the proper coolant mixture. With plain water or the wrong mixture, 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 mixture of clean, drinkable water andDEX COOL@coolant. Notice: In cold weather, water can freeze and crack the engine, radiator, heater core and other parts. Use the recommended coolant and the proper coolant mixture. You car. ._e burnec. you spi-. :oolant on hot engine parts. Coolant contains ethylene glycol and it will burn if the engine parts are hot enough. Don't spill coolant on a hot engine... When the coolant in the coolant recovery tank is at the COLD mark, start your vehicle. 5-39