Electric Cooling Fan
| ITEM | DESCRIPTION |
|---|---|
| 1 | Cooling fan shroud |
| 2 | Electric cooling fan motor |
| 3 | Electric connection |
| 4 | Air flow flaps |
An electric, variable speed cooling fan is installed in a shroud attached to the rear of the radiator. The electric cooling fan is operated by the engine cooling fan control module. The engine cooling fan control module is integrated into the electric motor. The engine cooling fan control module is controlled by the Powertrain Control Module (PCM) through a Pulse Width Modulation (PWM) signal. An electrical connector at the right of the cooling fan shroud provides the interface between the electric cooling fan harness and the vehicle wiring.
The engine cooling fan control module is provided with:
- A startup battery supply from the right Engine Junction Box (EJB).
- An ignition signal from the PCM relay in the rear EJB.
- A PWM signal from the PCM.
- A ground connection.
The PCM varies the duty cycle of the PWM signal to the engine cooling fan control module between 0 and 100% to operate the cooling fan motor:
- Off.
- Minimum speed - 750 Revolutions Per Minute (RPM).
- Linear variable speed between minimum and maximum speeds.
- Maximum speed - 2, 820 RPM.
The engine cooling fan control module incorporates a temperature sensor to prevent damage caused by excessive heat at high ambient temperatures. Operation of the engine cooling fan control module is discontinued if the temperature of the engine cooling fan module reaches 135°C (275°F). Operation resumes when the temperature decreases to 120°C (248°F).
Under hot operating conditions, the electric cooling fan may continue to operate for up to 5 minutes after the engine has been switched OFF.