1. When the air temperature through the radiator rises, the bimetal thermostat is subjected to thermal deformation, forcing the disc shaft to rotate and opening the oil inlet hole on the driven plate.The silicon oil stored between the moving plate and the front cover flows into the working chamber between the active plate and the driven plate.The higher the air temperature, the greater the opening of the inlet hole, the faster the fan speed.

2, when the air flowing through the radiator temperature drop, bimetallic flame state restorable, the valve closed oil hole, under the action of centrifugal force, silicone oil through the oil return hole returning from work cavity oil storage chamber, clutch, fan speed become very low.