Fault Phenomenon: A customer reflects that the water temperature of the engine is higher, which is also a relatively common fault. Then what is the cause? Let's carry out a detailed analysis below! uuuuuuuu

　　故障分析：启动车辆，连接 ISID 进行快速测试，检测无相关水温高散热器元件故障码。用电脑电子风扇，风扇高速转，说明电子风扇正常。试车开了十几，让车进入正常工况温度，连接 ISID 查看发动机数据，发现发动机冷却液温度慢慢的升 120 度，而水箱出水口温度却慢慢从 50 度降 33 度，不正常。尝试摸摸上水管和水箱下水管，发现温差极大，上水管极烫，下水管常温，此时电子风扇不转。

　　Fault analysis: Start the vehicle, connect the ISID for rapid testing, and detect the fault codes of unrelated water temperature and high radiator components. Activate the electronic fan with the computer, the fan rotates at high speed, indicating that the electronic fan is normal. Driving more than ten kilometers, let the car enter the normal operating temperature, connect ISID to check engine data, found that the engine coolant temperature slowly rose to 120 degrees, while the water tank outlet temperature slowly dropped from 50 degrees to 33 degrees, which is abnormal. Try to touch the water pipe and the water tank sewer, found that the temperature difference is great, the water pipe is extremely hot, the water pipe is at room temperature, at this time the electronic fan does not turn.

　　此时，判断有几个地方可能出现问题：

　　At this point, there are several possible problems in judging:

　　1、节温器不打开，无法完成大循环。

　　1. The thermostat can't complete the big cycle without opening it.

　　2、水泵损坏，无法使水循环。

　　2. The water pump is damaged and can't make the water circulate.

　　3、水箱堵死，水无法循环。

　　3. The water tank is blocked and the water can not be recycled.

　　4、发动机水道堵死或者可能气道和水道相同，气堵，无法完成水循环。

　　4. The engine waterway is blocked or the airway may be the same as the waterway, so the air blockage can not complete the water cycle.

　　故障结果：研究怀疑是不是节温器的问题，然而观察此车的水流情况，水泵泵的水经过通掉过后的节温器时，走的不是上水管，而是走通掉的空，进入到水箱下水管，导致发动机内的冷却循环断裂，上下水管温差，上水管无水流动。更换新的节温器后，发动机温度数值正常，原地启动几个小时也数值也正常，试车也没有出现高温现象

　　Failure results: The study suspects that the problem of thermostat is not a problem, but observes the flow of water in the car. When the water of the pump passes through the thermostat after passing through, it goes not through the upper pipe, but through the empty pipe, into the water tank and sewer pipe, resulting in the cooling cycle breaking in the engine, the temperature difference between the upper pipe and the lower pipe, and no water flow in the upper pipe. After replacing the new thermostat, the engine temperature values are normal, and the values are normal for several hours after starting in situ. There is no high temperature phenomenon in the test run.