1996 Buick Riviera Owner's Manual - Page 212

How to Add Coolant to the Coolant Recovery Tank If you haven'tfound a problem yet, but the coolant level isn't at FULL COLD, adda 50/50 mixture of.clean water (preferably distilled) DEX-COOL TM and (orange-colored, silicate-fkee) antifxeeze at coolant the in recovery tank. (See "Engine Coolant"the Index for more infomation.) I NOTICE: In cold weather, water ,can freeze crack the and 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. Plainwater, or some other liquid likealcohol, can boil before the proper coolant mix wili. Your vehicle'scoolant warning system is set forthe propercoolant mix. With plain water or thewrong mix, your enginecould get too hot but you wouldn't get the- overheat warning. Your engine could catch fire and or you others could be burned. Use a 50/50 mix of clean water andDEX-COOL TM antifreeze.