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What is the reason for the green water temperature light being on?

3 Answers
DeGianna
08/26/25 4:56am
When the green water temperature indicator light on the car dashboard stays on constantly, it indicates that the temperature is too high. When the water temperature in the radiator reaches 100 degrees Celsius while driving, the water temperature indicator light will illuminate. Correct actions to take when the green water temperature indicator light stays on: Keep the car idling and wait for it to cool down. After the water temperature has completely cooled down and cold water has been refilled, it is essential to find time to have the car inspected at a repair shop. The reason for "boiling over" is not just due to hot weather and the high workload of the air conditioning; it could also be caused by issues with the fan, thermostat, or water pump. Precautions when the water temperature indicator light is on: If the water temperature light is red, it indicates an abnormality in the engine cooling system; it could be due to low engine coolant or high water temperature. If the red light is on, it is recommended to check thoroughly before driving, otherwise the engine may be damaged due to excessive temperature.
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McCecilia
09/08/25 6:41am
During my recent car repair, I encountered several issues related to the coolant temperature light. A green light usually indicates that the engine hasn't reached its normal operating temperature, such as during a cold start or driving in extremely cold weather. The cooling system's low coolant temperature triggers this warning light as a protective mechanism to prevent you from accelerating too quickly and damaging the engine. After driving for a few minutes, as the coolant temperature rises, the light will naturally turn off. However, if the light comes on too frequently or remains on for an extended period, there might be underlying issues like a stuck thermostat or a malfunctioning coolant temperature sensor. These component failures can cause the engine to run in low-temperature mode, wasting fuel. I recommend paying attention to coolant temperature changes before each drive, allowing more warm-up time in winter, and promptly visiting a professional repair shop if the light doesn't turn off. Don't take it lightly.
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ODonovan
10/22/25 6:46am
As a guy who often tinkers with my own car, I figure that the green water temperature light coming on is a signal that the engine coolant temperature is too low. It normally appears during the initial cold start, like when you start the car after it's been sitting in the garage overnight. Reasons include cold environment, short trips without warming up the engine, or faults like a thermostat malfunction causing poor circulation. I've even replaced the sensor myself—saves money and hassle. When the light's on, engine efficiency drops and fuel consumption increases, so you should wait for it to go off before hitting the highway. If the light keeps coming on or doesn't turn off after driving for half an hour, use a multimeter to check the coolant temperature. If it's still not right, get it fixed to prevent engine wear.
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