What does the thermostat of the engine do? What happens if the thermostat doesn't work?

Thermostat is a valve that controls the flow path of coolant. At present, the commonly used temperature controller is mainly made of wax, which uses the principle of paraffin wax expanding with heat and contracting with cold to control the circulation mode of coolant. There are two modes of circulation: small circulation and large circulation.

When the cooling temperature is lower than the specified value, the refined paraffin in the thermostat temperature sensor is solid, the thermostat valve closes the passage between the engine and the radiator under the action of the spring, and the cooling liquid returns to the engine through the water pump and circulates in the engine.

When the temperature of the coolant reaches the specified value, paraffin wax begins to melt, gradually becomes liquid, the volume increases, and the rubber tube is compressed and shrunk. When the rubber tube contracts, it generates upward thrust on the push rod, and the push rod generates downward reverse thrust on the valve to open the valve. At this time, the coolant returns to the engine through the radiator and thermostat valve, and then returns to the engine through the water pump for large circulation.

From the working principle of thermostat, its main function is to quickly raise the water temperature and oil temperature when the temperature is low, so as to avoid engine wear. The minimum water temperature for engine wear is about 90 degrees. If the thermostat is not removed, its job is to circulate first. When the water temperature is lower than 83 degrees, the cooling water of the engine will not circulate. If this temperature is exceeded, the thermostat will slowly open the hot water of the engine and circulate it to the front water tank.

When it reaches a certain temperature, the electronic fan starts to dissipate heat, and the water in the water tank is cooled and then circulated to the engine from the sewer pipe of the water tank, so it works repeatedly.

If the thermostat is removed, the antifreeze will always circulate in a big way, so the heat dissipation will be great, the temperature will not stay, the engine will wear out and the car will be stuffy. Most importantly, warm air will not be generated because the water temperature is too low. Therefore, it will be very painful to have no thermostat in winter in the north, and it will be a special waste of oil if it is not installed in winter.

There is another misunderstanding here. Some car owners think that since the thermostat is effective in cold weather, can it stay in hot areas without a thermostat?

In fact, even in hot areas, when the car is just started, the water temperature will be lower than the temperature suitable for engine operation, and the thermostat can make the water temperature rise to the appropriate temperature quickly.

When the temperature is right, the thermostat will open and the cooling system will have a big cycle. If the water temperature is too high, there are three possibilities:

First, the thermostat is broken and will not open automatically when the temperature is high. At this time, the thermostat should be replaced.

Second, there may be something wrong with the coolant.

Third, there may be a problem with the cooling fan.