Electric Cooling Fan
| ITEM | DESCRIPTION |
|---|---|
| 1 | Electric cooling fan shroud |
| 2 | Electric connector |
| 3 | Air flow flap (quantity 9) |
| 4 | Electric cooling fan control module |
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 integrated into the electric motor. The Powertrain Control Module (PCM) controls the engine cooling fan with Pulse Width Modulation (PWM). An electrical connector at the right side 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 voltage from the PCM relay in the left 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.
The cooling fan motor has these 4 operation modes:
- 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 reaches 135°C (275°F). Operation resumes when the temperature decreases to 120°C (248°F).
In hot operating conditions, the electric cooling fan may continue to operate for up to 5 minutes after the engine has been switched off.