The pointer of the car's water temperature gauge reaches directly to the top, and the pot is not turned on. Unplug the water temperature sensor. How can I ground the iron? Which master can explain in

The pointer of the car's water temperature gauge reaches directly to the top, and the pot is not turned on. Unplug the water temperature sensor. How can I ground the iron? Which master can explain in detail, thank you!

The negative electrode of the car battery is connected to the car body. The car body is made of metal. Unplug the plug of the water temperature sensor to ground the copper connector in the plug. Short-circuit the copper connector of the water temperature sensor plug to the car body in a shiny and rust-free place on the engine or other places. Determine the fault. The water temperature sensor is a thermistor. The plug is suspended and the water temperature meter indicates that the temperature is at a low temperature point. After the connection is connected, the water temperature meter indicates that the water temperature is high. It was judged that the indicating instrument was good and the fault was that the sensor was damaged.