Some drivers may find that their tunnel loader and engine water temperature gauge always show that the temperature is too high. What is the reason? Today, let's analyze the causes of high engine water temperature.

判断发动机的水温是否过高，主要看发动机水温表，发动机的水温表表示的是发动机冷却液的温度，温度的正常范围在60℃-100℃，如果超过了这个温度，表示发动机水温过高。

To judge whether the water temperature of the engine is too high, it mainly depends on the engine water temperature gauge. The engine water temperature gauge indicates the temperature of the engine coolant. The normal range of temperature is 60 ℃ - 100 ℃. If it exceeds this temperature, it indicates that the engine water temperature is too high.

造成发动机水温高的原因：

Causes of high engine water temperature:

1、散热器内防冻液水位过低

1. The antifreeze level in the radiator is too low

此时需要检查副水箱的水位，如果水位低于警戒值，需要补充防冻液。

At this time, check the water level of the auxiliary water tank. If the water level is lower than the warning value, add antifreeze.

2、散热器堵塞

2. Radiator blocked

散热器上如果污垢过多或者堵塞，会影响散热器的散热效果。

Excessive dirt or blockage on the radiator will affect the heat dissipation effect of the radiator.

3、水泵损坏，水泵皮带过松

3. The water pump is damaged and the water pump belt is too loose

水泵损坏，会导致不能将冷却液输送到散热器中进行散热，水泵皮带过松，会导致输送水量不足。

If the water pump is damaged, it will not be able to deliver the coolant to the radiator for heat dissipation. If the water pump belt is too loose, it will lead to insufficient water delivery.

4、水管损坏，水泵吸入空气

4. The water pipe is damaged and the water pump sucks air

水管损坏，水泵吸入空气，导致输送冷却液不足。散热效果下降。

The water pipe is damaged and the water pump sucks air, resulting in insufficient coolant delivery. The heat dissipation effect decreases.

5、节温器损坏

5. Thermostat damaged

节温器的工作原理：当冷却温度低于规定值时，节温器感温体内的石蜡呈固态，节温器阀在弹簧的作用下关闭发动机与散热器之间的通道，冷却液经水泵进入发动机，进行发动机内小循环;当冷却液温度达到规定值后，石蜡开始融化逐渐变为液体，体积随之增 大并压迫推杆，推杆对阀门的反推力使阀门开启，此时冷却液进入散热器进行大循环。

Working principle of thermostat: when the cooling temperature is lower than the specified value, the paraffin in the thermostat sensing body is solid, the thermostat valve closes the channel between the engine and the radiator under the action of the spring, and the coolant enters the engine through the water pump for small circulation in the engine; When the coolant temperature reaches the specified value, the paraffin begins to melt and gradually becomes liquid, the volume increases and compresses the push rod, and the push rod's reverse thrust on the valve opens the valve. At this time, the coolant enters the radiator for large circulation.

节温器损坏会导致散热系统只进行小循环，冷却液不进入散热器。排查发动机系统故障时，我们要本着先易后难的原则，先排查维修比较简单的故障点，再排查维修比较难的故障点。

Damage to the thermostat will cause only a small circulation of the cooling system and the coolant will not enter the radiator. When troubleshooting the engine system, we should follow the principle of easy first and then difficult, first troubleshooting the fault points with relatively simple maintenance, and then troubleshooting the fault points with relatively difficult maintenance.