9-5 Sport Wagon (9600) L4-2.3L Turbo (B235) (2003)
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Blower Motor: Description and Operation
Ventilation Fan
Ventilation Fan
The fan is supplied with +30 from fuse 22. The control module regulates a control unit which supplies the fan motor on the ground side. The fan control
unit is situated on the driver's side of the heating and ventilation unit and is cooled by the flow of air in the evaporator.
The fan control unit is supplied with B+ from pin 5 on the ACC unit and power grounded from grounding point G41P. The ground lead is also reference
ground from pin 35 on the ACC unit. The fan control unit is controlled by an analogue voltage of 0-5 V from pin 14 on the ACC unit. The fan current
increases as the control voltage increases.
The control module regulates the fan current in the following way:
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If the engine is stationary, 5 A is selected.
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When the starter motor engages, 0 A is selected.
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When starting in cold weather, the coolant temperature and outside temperature are determined. The lower the values, the lower the current.
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Under normal driving conditions it is at its lowest when the current blended-air temperature corresponds with the requested temperature in both
zones (none of the zones requires cooling or heating). The current is increased as soon as either of the zones requires cooling or heating.
When defrost or HI has been manually selected, the fan current is set to 18 A. When LO is selected, the fan current is set to MAX. The desired fan speed
can also be selected manually on the panel. If fan speed 0 is selected, the A/C will be disengaged and ECON displayed.
