What Does It Mean When Antifreeze Boils Over?

[LaRobert]

Antifreeze boiling over refers to a situation where, during vehicle operation, the engine's high temperature causes the antifreeze temperature to rise to the boiling point, resulting in overflow. When the boiling antifreeze comes into contact with hot metal parts, white smoke is produced. The causes include: 1. The radiator stops functioning, leading to excessively high water temperature; 2. Antifreeze circulation failure due to a thermostat not opening, water pump malfunction, or blockage in the water circulation system; 3. Insufficient antifreeze or poor-quality antifreeze with a low boiling point, making it prone to boiling over. Automotive antifreeze, also known as coolant with antifreeze properties, is designed to allow the vehicle to operate in winter's low temperatures. Engine coolant contains substances that lower the freezing point of water, acting as antifreeze agents to prevent the cooling system from freezing in cold weather.