Should I Add Coolant or Water to the Radiator?

[SanChristian]

You should add coolant to the radiator. The main function of coolant is to cool the engine, which can operate at temperatures above 100 degrees Celsius. If water is added instead, it will boil directly and fail to effectively cool the car, potentially leading to severe engine damage or even cylinder explosion. Additionally, during cold winter weather, adding water can cause the radiator to freeze, resulting in damage. Coolant, also known as antifreeze coolant, is designed to prevent freezing, ensuring that it doesn't solidify in cold temperatures and cause the radiator or engine block to crack. Antifreeze should be used year-round, and as part of regular vehicle maintenance, the engine coolant should be replaced annually.