What does it mean when the water temperature gauge shows a red light?

[LeKathryn]

When the water temperature gauge shows a red light, it indicates that the water temperature is too high. Below is the normal water temperature range and how the water temperature gauge works: Normal water temperature range: The water temperature refers to the temperature of the coolant. After the engine warms up, it typically displays 70-90 degrees Celsius as normal. When the coolant level in the radiator is low, the water temperature will rise, and you need to add water at this point. If the water temperature gauge approaches the "H" mark or the red danger zone, and in severe cases, the water temperature warning light comes on, it means the engine coolant temperature is too high. How the water temperature gauge works: The sensor of the water temperature gauge is a thermistor-type sensor, which is fixed to the engine's coolant passage with threads. The thermistor determines the amount of current flowing through the coil windings of the water temperature gauge, thereby driving the movement of the gauge's pointer.