1997 GMC Suburban Owner's Manual - Page 255

How to Add Coolant to the Coolant Recovery Tank If you haven't found a problem yet, but the coolant level isn't at or above the COLD mark, adda 50/50 mixture of clean water (preferably distilled) and DEX-COOL@ (silicate-free) antifreeze at the coolant recovery tank. (See "Engine Coolant" in the Index for more information.) With plain water or the wrongi , your engine mx could get too hot you wouldn't get the but overheat warning.Your engine could catch fire and you or otherscould be burned.Use a 50/50 mix of clean water and DEX-COOL@ coolant. ~h I'ION: CAC Adding only plain water to your cooling system can be dangerous. Plain water, or some other liquid like alcohol, can before the proper boil coolant mixwill. Your vehicle's coolant warning mix. system is set for the proper coolant CAUTION: (Continued) 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. I 5-15