1997 Buick Park Avenue Owner's Manual - Page 244

How to Add Coolant tothe Coolant Recovery Tank If you haven't found a problem yet, but the coolant level isn't at or above the FULL COLD 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.) 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 beforethe proper coolant mix will. Your vehicle's coolant warning system isset for the proper coolant mix. With plain water or the wrong mix, your engine could get toohot but you wouldn't getthe overheat warning. Your engine couldcatch fire and you or others could beburned. Use a 50/50 mix of clean water and DEX-COOL@coolant.