aftermarket water temp gauge using original sending unit

• 2022-09-24

If your vehicle original sending unit is ok , can not replace a new one . Just replace a new aftermarket water temp gauge is ok . The interior of the automobile water temperature sensor is a semiconductor thermistor. The lower the temperature, the greater the resistance. On the contrary, the smaller the resistance is, it is installed on the water jacket of the engine block or cylinder head and directly contacts with the cooling water, so as to obtain the temperature of the engine cooling water .

Through the temperature of the engine water temperature, we can know the current running state, stop or running, or running time of the vehicle. The sending unit for the water supply thermometer is 12V, and the sensor for the engine control unit is 5V, so they are not interchangeable. Moreover, their plug shapes are different.

The temperature of the water temperature gauge is the temperature of the automobile coolant. Unless it is urgent, it is generally not necessary to add water. The coolant does not need to be replaced. It is OK to see that there is a lack of replenishment points. For most cars today, it is not necessary to replenish for 2 or 3 years at least, and for 5 or 6 years at most.

The power supply of the water temperature gauge is from the power supply voltage regulator. It is not allowed to connect it directly with the live line of the power supply on the vehicle, otherwise the reading of the indicator will be inaccurate and even the instrument will be damaged. If the water temperature gauge and sensor of the vehicle have been matched and damaged, the water temperature indicator or sensor of other models cannot be installed, and a new part of the same model should be replaced.

Check whether there is too much dust between the condenser and the water tank. Clean thoroughly with high-pressure gas to ensure good heat dissipation performance of water tank and condenser. When the vehicle is hot, the temperature difference between the upper and lower water pipes of the water tank shall not be too large. Otherwise, it is necessary to check the opening of the thermostat and whether the water pump has lost speed. After warming up. Antifreeze shall be replaced once every two years. Original accessories must be used during replacement and addition. In addition, it should be noted that after adding water to the engine cooling system, or the concentration of the added antifreeze exceeds 60%, the water temperature will be too high.