1997 Chevrolet Corvette Owner's Manual - Page 230

1A ~ CAUTION: NOTICE: ~ Adding only plain water to your cooling system can be dangerous. Plain water, or some other liquid like alcohol, boil beforethe proper can coolant mix will. Your vehicle's coolant warning system is set the proper coolant mix. With for plain water or the wrong mix,your engine could get toohot but you wouldn't getthe overheat warning. Your engine could catch fire and you or others could beburned. Use a 50150 mix of clean water and DEX-COOL@ coolant. In cold weather,water can freeze and crackthe engine, radiator, heater core and otherparts. So use the recommended coolant. A CAUTIOK You can be burned if you spill coolant on hot engine parts. Caolant contains ethylene glycol and itwill burn if the engine parts are hot enough. Don't spill coolant on a hot engine. 5-19