1998 Chevrolet Express Van Owner's Manual - Page 217

How to Add Coolant to the Coolant Recovery Tank If you haven't founda problem yet, but the coolant level isn't at the FULL COLD mark, add a 50/50 mixture of clean water (preferably distilled) and DEX-COOL@ engine coolant 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 mixture. 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 mixture will. Your vehicle's coolant warning system is set for the proper coolant mixture. With plain water the wrong mixture, or your engine could get too hot but wouldn't you Your engine could get the overheat warning. catch fire and or others could burned. you be Use a 50/50 mixture of clean water and DEX-COOL@coolant. I ... 5-16