What are the reasons for the slow rise of the water temperature gauge?

[LaAustin]

The reasons for the slow rise of the water temperature gauge are: 1. The water temperature sensor is installed on the engine block or cylinder head water jacket and directly contacts the coolant, measuring the temperature of the engine coolant. A faulty water temperature sensor can cause the gauge to rise slowly; 2. A damaged thermostat can affect the engine's normal operating temperature, leading to an unstable water temperature gauge; 3. A cooling system malfunction can cause the car's water temperature gauge needle to be unstable. The function of the car's water temperature gauge is to indicate the temperature of the coolant in the water jacket when the engine is running, with the scale unit in Celsius. When starting the engine, the water temperature gauge should indicate no less than 50 degrees, and during normal driving, the normal reading should be between 70 and 90 degrees.