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What are the reasons for unstable water temperature in the Mercedes-Benz M274 engine?

2 Answers

StDakota

08/31/25 3:53am

The reasons for unstable water temperature in the Mercedes-Benz M274 engine include: unstable voltage, water temperature sensor, water temperature gauge, and unstable working conditions of related connection circuits. Unstable voltage: First, confirm whether the water temperature is normal. If the water temperature is normal, it is caused by unstable voltage. Check for looseness or poor contact in the water temperature sensor and related circuits. Water temperature sensor: During vehicle operation, changes in engine water temperature are mainly directly related to factors such as vehicle speed, load, and road conditions. Abnormal water temperature is primarily related to the working conditions of the thermostat and electric fan. Additionally, if the external part of the radiator is clogged, poor ventilation and heat dissipation can lead to excessively high water temperature. Furthermore, if the water temperature gauge needle fluctuates between high and low, issues with temperature display cannot be ruled out, which are mainly related to the working conditions of the water temperature sensor, water temperature gauge, and related connection circuits.

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VanNicole

09/12/25 7:16am

When I was driving my Mercedes, I encountered unstable water temperature, which is probably related to the cooling system. Insufficient or leaking coolant can lead to poor engine heat dissipation, causing the water temperature to fluctuate. If the water pump or thermostat gets stuck and fails to open or close properly, it will affect water temperature control. A sudden rise in water temperature during high-speed driving and a noticeable drop after stopping are mostly caused by the water pump. Temperature sensor failures are also common, sending incorrect signals to the computer system and leading to misjudgment. Once, I ignored it, and the engine almost overheated, costing me thousands to repair. It is recommended to regularly check the coolant level and promptly visit a repair shop if any abnormalities are found to prevent small issues from turning into big troubles.

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