1997 Chevrolet Suburban Owner's Manual - Page 252

How to Add Coolant to the Coolant Recovery Tank If you haven't found a problem yet, but the coolant level mark, add a 50/50 mixture of isn't at or above the COLD clean water (preferably distilled) and DEX-COOL@ (silicate-free) antifreezeat the coolant recovery tank. (See "Engine Coolant"in the Index for more information.) CAUTION: ( C o n w e d ) With plain water or the wrong mix, your engine could get toohot but you wouldn'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 DEX-COOL@coolant. A CAUTION: Adding only plainwater to your cooling system can bedangerous. Plain water, or some other liquid like alcohol, can boil before the proper coolant mix will. Your vehicle's coolant warning system isset for the proper coolant mix. CAUTION: (Continued) - I NOTICE: In cold weather, water can freeze and crackthe engine, radiator, heatercore and other parts. Use the recommended coolant and the proper coolant mix. 5-15