auto temp gauge is this engine temp or oil temp

• 2022-05-24

Commonly known as "water temperature gauge", the thermometer reflects the temperature of antifreeze in the cooling system.The temperature displayed on the automobile instrument is the water temperature gauge, also known as the coolant temperature sensor.The slender head of the engine coolant temperature sensor contacts the coolant, and its interior is equipped with a thermistor with negative temperature coefficient. As shown in Figure 1 below, when the engine coolant temperature gradually increases, the resistance value of thermistor will gradually decrease, on the contrary, it will increase,Results when the engine coolant temperature changes, the output voltage of the sensor changes accordingly. After receiving the signal from the coolant temperature sensor, the ECU corrects the injection time and ignition time of the engine.

The oil temperature is a problem that we are more concerned about, because the oil temperature generally represents the working temperature of the engine, which indirectly reflects the working state of the engine. How much is normal?

Perfect working temperature: 90-100 ℃
Sub perfect working temperature: 80-90 ℃, 100-110 ℃
Imperfect working temperature: 70 ℃ - 80 ℃
Temperature not recommended to continue driving: > 120 ℃

This temperature is too low, which is not conducive to combustion, thus affecting the power; The temperature is too high, which is a great test for all parts of the engine, especially the oil seal and cushion. Therefore, we'd better control the oil temperature between 90-100 ℃ when we use the car at ordinary times, and it doesn't matter if it's 100-110 ℃. One day I was driving fiercely, and the temperature reached 120 ℃, but after a while, the normal driving temperature will drop back, which is no problem.

However, if the engine oil temperature reaches above 110 ℃ or even above 120 ℃ after driving for a while, we have to check the following aspects:

1. Doubt whether the added oil is appropriate and the quality is qualified;
2. Check whether the oil quantity is sufficient, whether the oil is deteriorated or there are too many impurities;
3. Whether the water tank leaks and whether there is less antifreeze;
4. Whether the electronic fan works abnormally;
5. Whether the thermostat works normally;
6. Whether the antifreeze is not circulating smoothly;
7. Whether the water temperature sensor is damaged or false alarm;
8. Whether the piston ring is well sealed;
9. Whether the radiator is blocked;
10. Whether the grid of China Grid is dirty and blocked;