What are the causes of a car's radiator boiling over?

1 Answers
NevaehLee
07/29/25 7:01pm
The causes of a radiator boiling over include insufficient water level; radiator blockage leading to poor circulation or backflow; water leakage from the radiator hindering water circulation; malfunctioning thermostat in switching between large and small circulation cycles; damaged cooling fan or short circuit causing fan failure, or very slow fan speed; and issues with the fan's water temperature sensor. Below are the handling methods for a car boiling over: When boiling over at low speed: Immediately pull the car over to the roadside, turn off the engine, and open the engine hood to allow faster heat dissipation. After the engine's water temperature drops, check if the coolant level is too low, inspect the radiator pipes for leaks, and verify if the cooling fan is operational. Generally, boiling over caused by low-speed driving is commonly due to radiator or pipe leaks, or the cooling fan not working. When boiling over at high speed: Pull over immediately, but do not turn off the engine. Similarly, open the engine hood and let the engine cool down naturally at idle speed for a while before shutting it off. If the engine is turned off immediately, the car's cooling system will stop working while the engine is still under high thermal load, which may lead to engine component deformation, cylinder scoring, and other phenomena.
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