The auxiliary cooling fan, if equipped, provides additional cooling under the following conditions:
• | Low speed vehicle operations |
• | Extended idle |
• | Stop-and-go conditions |
In cases of extreme coolant temperatures, the fan runs after engine shutdown. The auxiliary cooling fan is behind the grille on the right side of the vehicle.
The auxiliary cooling fan circuit consists of the following components:
• | The auxiliary fan |
• | A relay |
• | The vehicle control module (VCM) |
Once the VCM determines that the fan activation is appropriate (a function of coolant temperature, vehicle speed, and A/C system status), the VCM completes the ground side of the circuit to the relay coil. This energizes the relay, providing 12 volts to the auxiliary fan.
When the VCM determines that the fan operation is no longer required, the relay is de-energized, and voltage is no longer applied to the fan.
Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.