Why Does Car Antifreeze Overflow?

[NoahDella]

Antifreeze is an important consumable in the cooling system. The car cooling system is an essential component for vehicles, as it helps maintain a stable output power for the engine. Many car owners have encountered situations where antifreeze overflows from the reservoir. The reasons for this can be summarized into three points: 1. Damaged Cap: Check if the reservoir cap is damaged. If the cap is damaged, antifreeze may leak out due to the high temperature inside the reservoir. 2. Overfilled Antifreeze: If the antifreeze level exceeds the marked line on the reservoir, it may overflow during driving. No overflow occurs when the antifreeze level is appropriate. 3. Thermostat Malfunction: A faulty thermostat can cause the water temperature to rise excessively. When the water temperature is too high, the coolant cannot enter the engine's water passages for a full circulation, leading to a small circulation in the radiator and resulting in antifreeze overflow.