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：啟動車輛，連接 ISID 進行快速測試，檢測無相關水溫高散熱器元件故障碼。用電腦激活電子風扇，風扇高速轉(zhuǎn)，說明電子風扇正常。試車開了十幾公里，讓車進入正常工況溫度，連接 ISID 查看發(fā)動機數(shù)據(jù)，發(fā)現(xiàn)發(fā)動機冷卻液溫度慢慢的升至 120 度，而水箱出水口溫度卻慢慢從 50 度降至 33 度，不正常。嘗試摸摸上水管和水箱下水管，發(fā)現(xiàn)溫差極大，上水管極燙，下水管常溫，此時電子風扇不轉(zhuǎn)。

　　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.

　　此時，判斷有幾個地方可能出現(xiàn)問題：

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

　　1、節(jié)溫器不打開，無法完成大循環(huán)。

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

　　2、水泵損壞，無法使水循環(huán)。

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

　　3、水箱堵死，水無法循環(huán)。

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

　　4、發(fā)動機水道堵死或者可能氣道和水道相同，氣堵，無法完成水循環(huán)。

　　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.

　　故障結果：研究懷疑是不是節(jié)溫器的問題，然而觀察此車的水流情況，水泵泵的水經(jīng)過通掉過后的節(jié)溫器時，走的不是上水管，而是走通掉的空，進入到水箱下水管，導致發(fā)動機內(nèi)的冷卻循環(huán)斷裂，上下水管溫差，上水管無水流動。更換新的節(jié)溫器后，發(fā)動機溫度數(shù)值正常，原地啟動幾個小時也數(shù)值也正常，試車也沒有出現(xiàn)高溫現(xiàn)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.