1996 Pontiac Bonneville Owner's Manual - Page 224

How to Add Coolant to theCoolant Recovery Tank If you haven't found a problem yet, but the coolant level isn't at theFULL COLD mark, add-a 50/50 mixture of clean water (preferably distilled) and DEX-COOL TM (orange-colored, silicate-free) antifreeze at the coolant recovery tank. (See "Engine Coolarit" in the Index for more information.) -coolantmix will. Your vehicle'scoolant warning system is set for the proper coolant With mix. plain wateror the wrong mix, your engine could get too hot but you wouldn't get the overheat warning. Your enginecould catch fire and or you others could be burned. Use a 50/50 mix of clean water andDEX-COOL TM antifreeze. cooning system Adding only plain water to your can be dangerous. Plain water, or some other liquid like alcohol, can boil before the proper CAUTION: (Continued) NOTICE: In cold weather, water can freeze and crack the engine, radiator, heater core other parts. and Use the recommended coolant andthe proper coolant mix.