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Why is the water temperature rising slower than before?

1 Answers

LaMatthew

07/30/25 3:34am

After starting, the vehicle undergoes a warm-up process. The slow rise in water temperature indicates the engine is warming up. The duration of this process depends on the temperature detected by the water temperature sensor. If the water temperature sensor is functioning properly, the issue might be that the thermostat is continuously allowing a large coolant circulation, causing the water temperature to rise more slowly. Here are the specific reasons: 1. First reason: The engine water temperature being too low is usually caused by a faulty thermostat that fails to close or a malfunctioning cooling fan that is constantly running. 2. Second reason: The cooling fan might be running continuously, causing the water temperature to drop rapidly, but a faulty thermostat is more likely to be the cause.

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