1997 Oldsmobile Bravada Owner's Manual - Page 202
1997 Oldsmobile Bravada Manual
Page 202 highlights
How to Add Coolant to the Coolant Recovery Tank If you haven't found a problem yet, but the coolant level isn't at the ADD mark, add a 50/50 mixture of clean water (preferably distilled) and DEX-COOL (silicate-free) antifreeze at the coolant recovery tank. (See "Engine Coolant'' in the Index for more information.) TM I 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 mix. Adding only plain water to your cooling system can be dangerous. Plain water, or some other liquid like alcohol, can boil before the proper coolant mixwill. Your vehicle's coolant warning system is set for the 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 waterand DEX-COOL coolant. 5-16 -