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　　Thermostat (thermostat) is based on the amount of water in cooling water temperature automatic adjustment into the radiator, change the water cycle, in order to adjust the cooling capacity of cooling system, ensure the engine work in the appropriate temperature range.The thermostat must maintain a good technical state, otherwise it will seriously affect the normal operation of the engine.If the main valve opens too late, the engine will overheat.When the main valve opens too early, the engine preheating time is extended to make the engine temperature too low.All in all, the function of the thermostat is to keep the engine from too cold.For example, when the engine is working properly, the temperature of the engine may be too low if there is no thermostat in the winter.At this point, the engine needs to suspend the water to ensure that the engine temperature is not too low.Mainly use the thermostat is wax type thermostat, when cooling temperature is lower than the specified value, the thermostat heat in the body of refined paraffin wax were solid, thermostat valve in the spring under the action of closing the passage between the engine and radiator, cooling fluid through the pump to return to the engine, with minor cycle in the engine.When the temperature of the coolant reaches the specified value, the wax begins to melt and gradually becomes liquid. The volume increases and then presses the rubber hose to make it shrink.When the rubber tube contracts, the push rod can be pushed upward, and the push rod has a downward thrust against the valve to open the valve.The coolant is then pumped back through the radiator and the thermostat valve and pumped back into the engine.Most of the thermostats in the cylinder cover and outlet pipeline, the advantages are simple structure and easy to eliminate the bubbles in the cooling system;The disadvantage is that the thermostat often opens and closes at work, producing oscillation phenomena.