1997 Chevrolet Blazer Owner's Manual - Page 279
1997 Chevrolet Blazer Manual
Page 279 highlights
A CAUTION: Adding only plain waterto yourcooling system can be dangerous. Plainwater, or some other liquid like alcohol, can boil before theproper coolant mix will. Your vehicle'scoolant warning system is setfor the proper coolant mix. With plain water or thewrong mix, your engine could get too hot but you wouldn't get the overheat warning. Your engine could catch fire and or you others could be burned.Use a 5060 mix of clean water and DEX-COOL@coolant. NOTICE: If you usean improper coolant mix, your engine could overheat andbe badly damaged. The repair cost wouldn't be coveredby your warranty. Too much waterin the mix can freeze and crack the engine, radiator, heater core and other parts. If you have to add coolant more than four times ayear, have your dealer checkyour cooling system. I NOTICE: If you use the propercoolant, you don't have to add extra inhibitors additives which claim to or improve the system. These can be harmful. 6-24