Why does coolant keep flowing out from the overflow tank?

[MaddoxLynn]

Coolant flows out from the overflow tank for the following reasons: 1. Excessive coolant: If the coolant exceeds the marked line on the tank, it will overflow during vehicle operation. 2. Thermostat failure: A faulty thermostat can cause excessively high water temperature. When the water temperature is too high, the coolant cannot enter the engine water passage for major circulation, leading to minor circulation in the radiator and resulting in coolant overflow. Additional information about coolant is as follows: 1. Characteristics of coolant: It has a very high boiling point and a very low freezing point. In summer, it primarily serves to cool the engine, while in winter, it mainly prevents the engine from freezing. 2. If the coolant loss is within a reasonable range, you can add more yourself, but it must be the same type of coolant.