Does Overfilling Antifreeze Affect the Car?

1 Answers
JudahFitz
07/29/25 5:59pm
Overfilling antifreeze does affect the car. When antifreeze is overfilled, the excess may overflow from the pressure relief valve due to thermal expansion and contraction. The antifreeze reservoir has a marked fill line, and it should only be filled up to that line. Car antifreeze is a coolant with antifreeze properties, preventing the coolant from freezing in cold winter weather, which could otherwise crack the radiator or damage the engine cylinders. Antifreeze is used year-round, with special additives primarily for liquid-cooled engine cooling systems. It offers excellent performance in preventing freezing in winter, boiling in summer, and corrosion year-round. Generally, antifreeze is used in cars and other internal combustion engine machinery like ships.
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