Electric Cooling Fan

Electric Cooling Fan

The variable speed electric cooling fan is controlled by the ECM. The ECM uses a remote power output final stage (mounted on the fan housing). The power output stage receives power from the fuse (50 amp) junction located on the right inner fender of the engine compartment (under the remote charging post). The electric fan is controlled by a pulse width modulated signal from the ECM.

The fan is activated based on the ECM calculation of:

- Coolant outlet temperature (monitored by the Outlet Temperature Sensor in the thermostat housing)
- Catalyst temperature
- Vehicle speed
- Battery voltage
- Air Conditioning high side pressure (calculated by IHKA via a bus signal to the ECM)