1993 Buick LeSabre Owner's Manual - Page 213

How to Add Coolant to the Coolant Recovery Tank If you haven't found a problem yet, but the coolant level isn't at or above "FULL COLD," add a 50/50 mixture of clean water (preferably distilled) and a proper antifreeze at the coolant recovery tank. (See "Engine Coolant" in the Index for more information about the proper coolant mix.) I NOTICE 1 I In cold weather, water c I fr ze an :rack engine, radiator, heatercore and other parts. Us€ the recommended coolant. 'A CAUTION: Q Adding only plain water to your cooling system can be dangerous. Plain water, some other or liquid like alcohol, can boil before the proper coolant mix will. Your vbhicle's coolant warning system is set for the properecoolantmix. With plain water or the'wrong mix, your engine could get too hot but you douldn't get the overheat warning. Your engine could catch fire and you or others could be burned. Use a 50/50 mix of clean water and a proper antifreeze." 211