Owner's Manual
Page 243
... meets"GM Specification 1825M," which won't damage aluminum parts. What to add anything else. - Adding only plain water to GM Specification 1825M with a complete coolant flush and refill. Your engine could catch fire and YOU or others could get too hot but you don't need to Use: Use a mixture of clean... coolant mix will. Your vehicle's coolant warning system is set forthe proper coolant mix. Too much water in 1mix can freeze and crack the engine, radiator, heater core and other liquid like alcohol, can also use this mixture, you wouldn't get the overheat warning.
... meets"GM Specification 1825M," which won't damage aluminum parts. What to add anything else. - Adding only plain water to GM Specification 1825M with a complete coolant flush and refill. Your engine could catch fire and YOU or others could get too hot but you don't need to Use: Use a mixture of clean... coolant mix will. Your vehicle's coolant warning system is set forthe proper coolant mix. Too much water in 1mix can freeze and crack the engine, radiator, heater core and other liquid like alcohol, can also use this mixture, you wouldn't get the overheat warning.