What does it mean when the water temperature gauge lights up?

[JeremiahFitz]

When the water temperature gauge lights up, it indicates a malfunction in the engine's cooling system, which prevents it from ensuring proper cooling of the engine. The water temperature gauge uses colors to display different statuses: green indicates the water temperature is too low, red indicates the water temperature is too high, and no light indicates normal operation. The car's water temperature gauge is used to monitor the water temperature and is typically installed at the outlet of the water passage. The gauge ranges from C to H. When the pointer points to C, it means the water temperature has reached 60 degrees. When the pointer points to H, it means the water temperature has reached 110 degrees. Prolonged high water temperature can reduce the lubrication effectiveness of the engine oil, leading to wear and tear of internal engine components.