1995 Buick Century Owner's Manual - Page 184

I NOTICE: In cold weather, watercan beeze and crack the engine, radiator?heater core and other parts. Use the recommendedcoolant. When the coolant in the coolantrecovery tank is at the FULL HOT, start your vehicle. If the overheat warning continues, there's one more thing you can try. You can add the proper coolant mix directly to the radiator, but be sure the cooling system is cool before you do it. 5-18