What is the indicator for high car coolant temperature?

[LaSimon]

When the car's coolant temperature is high, a thermometer inserted into wavy lines resembling water will be displayed on the coolant temperature gauge. More information about the coolant temperature gauge is as follows: 1. The sensor of the coolant temperature gauge is a thermistor-type sensor. It is fixed with threads on the engine's cooling water passage. The thermistor determines the current flowing through the coil winding of the coolant temperature gauge, thereby driving the pointer to swing. 2. In the past, tap water was used as the coolant for car engines. Now, many car engine cooling systems use specialized coolant. Therefore, it is also called the coolant temperature gauge. This indicator light is used to display the temperature of the coolant inside the engine. When the ignition is turned on and the vehicle performs a self-check, the light will illuminate for a few seconds and then turn off. If the coolant temperature indicator light remains on, it means the coolant temperature has exceeded the specified value, and driving should be paused immediately. The coolant temperature indicator light will turn off once the temperature returns to normal.