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The symptoms of a broken thermostat are: 1. The opening of the thermostat is too small. In this case, most of the coolant is in a small circulation state, that is, the coolant does not pass through the water tank to dissipate heat; The engine warm-up time is prolonged, and the engine temperature is too low, thereby affecting the performance.

The most obvious symptoms will be shown on the water temperature gauge. The main valve of the thermostat is opened too late or too early. If it is opened too late, it will cause the engine to overheat; if it is opened too early, the engine warm-up time will be prolonged, and the engine temperature too low, thus affecting performance. To put it simply, if you see from the water temperature gauge that the engine water temperature is too high or too low, it may be a thermostat failure.

The thermostat cannot be turned on, the water temperature gauge shows a high temperature area, and the engine temperature is high, but the temperature of the coolant in the water tank is not high, and the radiator does not feel hot when you touch it with your hands. If the thermostat of the car is not turned off, the water temperature will rise slowly, especially in winter, the idle speed will be high. If the main valve of the thermostat is closed for a long time, it will naturally lose the function of the thermostat to automatically adjust the water volume (it is always in a small cycle state). Then when the engine is running at high speed, due to the lack of timely cooling, it will not only accelerate the wear and tear of the internal parts of the engine, but also “boil the pot”, and the maintenance cost at that time is quite high.

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