Electric Cooling Fan - If Equipped
| Item | Description |
|---|---|
| 1 | Top mount |
| 2 | Speed flaps (8 off) |
| 3 | Electric cooling fan blade |
| 4 | Electrical connector |
| 5 | Lower mount (2 off) |
| 6 | Electric cooling fan motor |
| 7 | Cooling fan shroud |
The electric engine cooling fan is a variable speed fan installed in a shroud attached to the front of the radiator. The shroud incorporates speed flaps, which pivot open to allow engine compartment cooling at speed.
The electric cooling fan is operated by the engine cooling fan control module, integrated into the electric motor, which is controlled by the Powertrain Control Module (PCM). An electrical connector at the right side of the fan shroud provides the interface between the electric cooling fan harnesses and the vehicle wiring.
The engine cooling fan control module is provided with:
- A battery power supply from Engine Junction Box (EJB)
- An ignition signal from the PCM relay in the EJB
- A Pulse Width Modulation (PWM) signal from the PCM
- A ground.
To control the electric cooling fan, the PCM varies the duty cycle of the PWM signal. The engine cooling fan control module translates the duty cycle into a fan target speed and sets the output current to the electric cooling fan motor accordingly.
Depending on market and model specification, vehicles are equipped with either a viscous cooling fan, or a viscous cooling fan and an electric cooling fan to help regulate the engine coolant temperature.