Range Rover (LM) V8-4.4L (2009)
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Control Module HVAC: Description and Operation
VISCOUS FAN CONTROL
The ECM (engine control module) controls a viscous coupled fan to provide engine cooling. The ECM (engine control module) supplies the fan with a
PWM (pulse width modulation) signal that controls the amount of slippage of the fan, thus providing the correct amount of cooling fan speed and
airflow. The EMS uses a Hall Effect sensor to determine the fan speed.
