1996 Chevrolet S10 Pickup Owner's Manual - Page 205

How to Add Coolant to the Coolant Recovery Tank If you haven't found a problem but the coolant level yet, isn't at ADD,add a 50/50 mixture of clean water (preferably distilled) andDEX-COOL TM (orange-colored, silicate-free) antifreeze 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 mix. k!,CAUTICJ: Adding only plain. water to your cooling system can be dangerous. Plain water, or some other liquid likealcohol, can boil before the proper coolant mixwill. Your vehicle's coolant warning mix. system is set for the proper coolant With plain water or the wrong your engine could mix, get too hotbut you wouldn't get the overheat warning. Your engine could catch fire and or you others couldbe burned. Use a 5W50 mix of clean water and DEX-COOL TM antifreeze.