THERMO Control Fan: Description

This unit consists of thermostatically controlled fluid fan drive (torque control clutch). Thermal control drive is silicone filled coupling connecting fan to fan pulley. Drive is operated by control valve. Control valve is governed by temperature sensitive bimetal coil or strip. Control valve maintains flow of silicone through drive.

During periods of operation when radiator discharge air temperature is low, fan drive limits fan speed. High radiator discharge air temperature causes bimetal to allow greater flow of silicone to enter drive. This increases drag between driven member and driving member, resulting in higher fan speed and increased cooling.