mercury Workshop Repair Guides

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Radiator Cooling Fan Speed Sensor: Description and Operation

FAN SPEED SENSOR (FSS)

Cooling Fan Clutch With FSS

The FSS is a Hall-effect sensor that measures the cooling fan clutch speed by generating a waveform with a frequency proportional to the fan speed. If
the cooling fan clutch is moving at a relatively low speed, the sensor produces a signal with a low frequency. As the cooling fan clutch speed increases,
the sensor generates a signal with a higher frequency. The PCM uses the frequency signal generated by the FSS as a feedback for closed loop control of
the cooling fan clutch.

Engine, Cooling and Exhaust > Cooling System > Sensors and Switches - Cooling System > Radiator Cooling Fan Speed Sensor > Component Information > Description and Operation

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