What is the reason for the slow rise of the car's water temperature gauge?

[MacJayden]

If the car's water temperature gauge is slow to rise, it is likely due to a malfunctioning water temperature sensor. The water temperature sensor is installed in the water jacket of the engine block or cylinder head and directly contacts the coolant to measure the temperature of the engine coolant. If the water temperature sensor fails or malfunctions, the engine ECU will detect that the output signal from the water temperature sensor is unreliable. Hazards of low water temperature in winter: 1. It can lead to incomplete fuel combustion, reducing the engine's efficiency; 2. Incomplete fuel combustion causes carbon deposits, which both increase fuel consumption and pollute the environment; 3. Prolonged operation of the car in low temperatures can accelerate the wear of internal engine components.