THERMO Control Fan: Description

This unit consists of a thermostatically controlled fluid fan and torque control clutch. The thermal control drive is a silicone filled coupling connecting the fan to the fan pulley. The drive is operated by a control valve and the control valve is operated by a temperature sensitive bimetal coil or strip. The control valve maintains the flow of silicone through the clutch. During periods of operation when radiator discharge air temperature is low, the fan clutch limits the fan speed. High radiator discharge air temperature causes bimetal to allow a greater flow of silicone to enter the clutch. This increases the drag between the driven member and driving member, resulting in a higher fan speed and increased cooling.