Does Overfilling Coolant Affect the Car?

[AngelinaDella]

Overfilling coolant does not affect the car. When the coolant is overfilled, the excess will overflow from the pressure relief valve due to thermal expansion and contraction. Generally, the coolant reservoir has both a "max" (maximum level) and "min" (minimum level) marking. The coolant should be filled between the "max" and "min" levels. Coolant prevents the freezing of the liquid in the cooling system during cold weather, which could otherwise crack the radiator or damage the engine block. It is not just for winter use but should be used year-round. Coolant is an essential working medium for the proper functioning of water-cooled engines, consisting of water, antifreeze agents, and additives. Depending on the antifreeze agent, it can be classified into types such as alcohol-based, glycerol-based, and ethylene glycol-based.