How does the Hyundai Verna indicate overheating?

[Daedalus]

If the engine coolant temperature exceeds 120°C, the water temperature warning light will illuminate. Here are the detailed explanations: 1. Introduction: The water temperature indicator utilizes a bimetallic strip sensor switch threaded into the cylinder block water jacket. This switch controls the red warning light (high-temperature indicator) on the instrument panel. Within normal operating temperature ranges, the switch contacts remain open, keeping the indicator off. When coolant temperature exceeds normal limits, the switch arm contacts close, activating the red warning light. 2. Function: This indicator displays the engine coolant temperature. During vehicle self-check when turning the ignition key, the light will illuminate briefly (few seconds) then turn off. Continuous illumination indicates the coolant temperature has exceeded specified limits, requiring immediate stoppage of driving. The light will extinguish when the coolant temperature returns to normal.