1997 Buick Regal Owner's Manual - Page 255

~~ How to Add Coolant to the Coolant Recovery Tank NOTICE: If you haven't found a problem yet, but the coolant level In cold weather, water canfreeze and crack the isn't at the COLD mark, add a 50/50 mixture of clean engine, radiator, heater core other parts. and water (preferably distilled) and DEX-COOL@ Use the recommended coolant and the proper (silicate-free) antifreeze at coolant recovery tank. the i x coolant m . (See "Engine Coolant" in Index for the more information.) I I / CAUTION: a 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 mix will. Your vehicle'scoolant warning system is set for the proper coolant mix. With plain wateror thewrong mix, your engine could get toohot but you wouldn't getthe overheat warning. Your engine could catch fireand you or others could be burned. Use a 50/50 mix of clean water andDEX-COOL@coolant. 5-19