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What causes water to gush out when opening the radiator cap?

1 Answers

VanChase

07/29/25 1:55pm

The reason for water gushing out when opening the radiator cap: Generally, it's due to thermal expansion and contraction, which is a normal phenomenon. Introduction to car radiators: Normally, the radiator cap covers this position, with the spring pushing the gasket to seal the radiator, ensuring the cooling system operates under certain pressure. When the cooling system pressure becomes too high, the coolant pushes open the spring, and excess coolant vapor flows through the adjacent tube into the expansion tank. Precautions when opening the radiator cap: A standard radiator cap is part of this cooling system, where the radiator has a coolant filling port. The radiator cap should not be opened casually because, under high temperatures, opening it may cause coolant to spray out, which is very dangerous. It controls the overflow of coolant from the radiator to the expansion tank and also regulates the flow of coolant from the expansion tank back into the radiator.

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