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Currently, most diesel engines use wax - type thermostats with stable working performance. When the temperature of the cooling water is lower than 83°C, the thermostat valve closes. The cooling water can only circulate in a small loop within the diesel engine without passing through the water tank for a large - scale circulation. This accelerates the rise of the cooling water temperature, shortens the warm - up time, and reduces the running time of the diesel engine at low temperatures. When the coolant temperature reaches the opening temperature of the thermostat valve, 83°C, as the temperature of the diesel engine gradually rises, the thermostat valve gradually opens. More and more coolant participates in the large - scale circulation for cooling, and the heat - dissipation capacity increases accordingly. Once the temperature reaches or exceeds the full - opening temperature of the main valve, 95°C, the main valve fully opens, and the auxiliary valve completely closes the smal...