1995 Cadillac DeVille Owner's Manual - Page 251

Hw o to Add Coolant to the Coolant Recovery Tank If you haven't found a problem yet, but the coolantlevel isn't at or near the FULL COLD mark on the &ant recovery tank, add a 50/50 mixture of clenu 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.) NOTICE: In cold weather, water can freeze and crack theengine, radiator, heater core and other parts. Use the recommended coolant. 5-16