1994 GMC Jimmy Owner's Manual - Page 216

NOTICE: In cold weather, water can freeze and crack the engine, radiator, heater core and other parts. Use the recommended coolant. When the coolant in the coolant recovery tankat or above the the is ADD mark, start your vehicle. If the overheat warning continues, there's more thingyou can try. You one can add the proper coolant mix directly to the radiator but be sure the cooling system is cool beforeyou do it. 5-14