Antifreeze 101: Is Your Buick or GMC’s Cooling System Ready for the First Illinois Freeze?
Your coolant level might look fine. That doesn’t tell you whether it’ll hold up on a night well below zero. Antifreeze works all year. In summer it keeps the engine from overheating. In winter it lowers the freezing point so the fluid stays liquid instead of freezing and expanding inside your radiator, hoses and engine….