What Causes Engine Radiator Overflow?

1 Answers
VonEvan
07/30/25 8:55am
Engine radiator overflow can be caused by the following reasons: Engine Overheating: Engine overheating and high pressure can cause overflow. Additionally, a damaged cylinder head gasket or a faulty radiator cap may also lead to water overflow. The radiator cap contains a one-way valve that can cause water to overflow if it malfunctions. Radiator Damage or Incorrect Operation: Overfilling with water, trapped air in the radiator or engine that is difficult to release, poor sealing of hoses allowing air to enter, or a damaged thermostat or electric fan can all cause overflow. During coolant circulation, air may force the coolant out of the radiator. A cracked or slightly fractured engine cylinder liner can also allow compressed gas from the cylinder to forcibly expel the coolant from the radiator while the engine is running.
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