What Happens If the Antifreeze Is Overfilled?

[PaigeFitz]

Overfilling antifreeze can cause it to expand due to heat during vehicle operation and overflow from the pressure relief valve. If the reservoir cap does not seal properly, a significant amount of antifreeze may leak outside the vehicle, leading to a shortage of antifreeze. Excessive antifreeze does not have a major impact on the cooling system, as the system is equipped with a pressure regulation device. After the engine starts and the coolant temperature rises, the antifreeze will expand due to thermal expansion and overflow from the relief valve. This is not harmful but may leave stains after drying. Antifreeze offers excellent performance in preventing freezing in winter, boiling in summer, and corrosion year-round. It is widely used in automotive internal combustion engines, ships, and other mechanical equipment.