The performance of the thermostat can be judged by the following faults.

　　节温器坏了通常有两种症状

　　There are usually two symptoms when the thermostat breaks down

　　如果节温器不打开，水温将显示在高温区域的温度计上，但水箱风扇不转。

　　If the thermostat is not turned on, the water temperature will be displayed on the thermometer in the high temperature area, but the fan of the water tank will not turn.

　　如果汽车节温器不关闭，水温会缓慢上升，尤其是在冬季，水温仍处于低温区10-20分钟，怠速较高。

　　If the car thermostat is not closed, the water temperature will rise slowly, especially in winter, the water temperature is still in the low temperature zone for 10-20 minutes, idling speed is higher.

　　汽车的节温器坏了

　　The car's thermostat is broken.

　　节温器故障诊断方法:

　　Thermostat fault diagnosis method:

　　冷车启动后，立即打开散热器喷嘴盖。如果散热器中的冷却水是平静的，说明节温器工作正常;否则，这表明节温器不能正常工作。这是因为当水温低于70℃时，节温器膨胀管处于收缩状态，主阀关闭;当水温高于80℃时，膨胀管膨胀，主阀逐渐打开，散热器中的循环水开始流动。

　　After the cold car starts, open the radiator nozzle cover immediately. If the cooling water in the radiator is calm, it means that the thermostat is working normally; otherwise, it means that the thermostat is not working properly. This is because when the water temperature is lower than 70 C, the expansion tube of the thermostat is in a contraction state and the main valve closes; when the water temperature is higher than 80 C, the expansion tube expands, the main valve opens gradually, and the circulating water in the radiator begins to flow.

　　当水温指示器低于70℃时，散热器进入水管内若有水流，水温升高，表温调温器主阀关闭不严，使冷却水循环过早。

　　When the water temperature indicator is lower than 70 C, if the radiator enters the water pipe, the water temperature rises, and the main valve of the surface temperature regulator is not closed tightly, which makes the cooling water circulate too early.

　　如果节温器没有坏，可以看到水温升高后是否有水从发动机出水管流出，并且可以感觉到水流通过管子。如果没有感觉到水流，那么水泵或发动机的水循环就会被堵塞，这就更麻烦了。

　　If the thermostat is not damaged, you can see if there is water flowing out of the engine outlet pipe when the water temperature rises, and you can feel the water flowing through the pipe. If there is no sense of water flow, then the water circulation of the pump or engine will be blocked, which is even more troublesome.

　　节温器故障诊断方法:

　　Thermostat fault diagnosis method:

　　一种确定节温器是否损坏的方法

　　A Method for Determining the Damage of Thermostats

　　当发动机开始运行时，如果水箱上部水室进水管仍有冷却水流出，则说明节温器的主阀不能关闭。当发动机冷却水温度超过70℃时，水箱上部水室进水管没有冷却水流出，说明温控器主阀不能正常打开，需要维修。

　　When the engine starts to run, the main valve of the thermostat can not be closed if there is still cooling water flowing out from the intake pipe of the upper chamber of the water tank. When the cooling water temperature of the engine exceeds 70 C, there is no cooling water flowing out from the intake pipe of the upper water chamber of the water tank, which indicates that the main valve of the thermostat can not be opened normally and needs to be repaired.

　　节温器检测可在车内通过以下方法进行:

　　Thermostat detection can be carried out in the car by the following methods:

　　发动机起动后检查:

　　Engine post-start inspection:

　　打开散热器喷嘴盖。如果散热器中的冷却水是平静的，这意味着节温器工作正常。否则，这意味着节温器不能正常工作。这是因为当水温低于70℃时，节温器膨胀管处于收缩状态，主阀关闭;当水温高于80℃时，膨胀管膨胀，主阀逐渐打开，散热器中的循环水开始流动。当水温表显示低于70℃时，如果有水进入散热器管道，水温为暖，说明节温器的主阀没有严格关闭，使冷却水循环过早。

　　Open the radiator nozzle cover. If the cooling water in the radiator is calm, it means that the thermostat works properly. Otherwise, this means that the thermostat is not working properly. This is because when the water temperature is lower than 70 C, the expansion tube of the thermostat is in a contraction state and the main valve closes; when the water temperature is higher than 80 C, the expansion tube expands, the main valve opens gradually, and the circulating water in the radiator begins to flow. When the water thermometer shows below 70 C, if water enters the radiator pipe, the water temperature is warm, indicating that the main valve of the thermostat is not strictly closed, so that the cooling water circulation is too early.