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What Causes the Coolant Reservoir to Keep Making Noise After the Car is Turned Off?

1 Answers

Willow

07/30/25 3:03am

Possible reasons include a damaged radiator cap or insufficient antifreeze. Below is relevant information about coolant: Introduction: Used in automobiles, diesel locomotives, tractors, ships, engines, radiators, and various mechanical equipment, diesel and gasoline engines as a coolant in cooling systems. It has multiple functions such as antifreeze, anti-boil, anti-corrosion, and anti-scale. The boiling point of water is 100°C, while high-quality antifreeze coolant typically has a boiling point above 110°C, making it less prone to boiling over in summer compared to water. Reasons: The coolant reservoir cap is damaged, and the temperature inside the reservoir is very high. The coolant level exceeds the upper mark on the reservoir. A faulty thermostat causes the water temperature to rise too high, preventing the coolant from entering the engine's water passages for major circulation.

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