What Causes the Overflow of the Expansion Tank?

[DelSilas]

The reasons for the expansion tank overflowing include excessive engine temperature, high coolant temperature, and blockages in the radiator or hoses. Causes of expansion tank overflow: When the engine temperature is too high, the coolant may boil and overflow from the expansion tank cap due to excessive pressure. The underlying cause of the high engine temperature should be identified and addressed. High coolant temperature during driving is managed by natural airflow and the cooling fan, but the fan stops working after the engine is turned off. Blockages in the radiator or hoses, or leaks from the radiator cap or the cap connecting to the engine, can also cause overflow. Function of the car radiator: Also known as the heat exchanger, it is a key component of the car's cooling system, designed to dissipate heat.