The electro-drive cooling fan system consists of a fan and electric motor attached to a fan shroud located behind the radiator. The system utilizes a coolant temperature switch which is usually mounted in the thermostat housing. Vehicles that are equipped with air conditioning, have a cooling fan controller and a cooling fan relay for the cooling fan system. On vehicles with a standard heater, the engine cooling fan is powered through the cooling fan relay.
The electro-drive cooling fan is wired to operate only when the ignition switch is in the RUN position. A thermal switch mounted in the thermostat housing activates the fan when the cool ant reaches a specified temperature. When the temperature is approximately 210°F (85°C) the thermal switch closes thus starting the fan.
The electric fan also operates when the air conditioner (if equipped) is turned on. When the temperature drops to between 185-193°F (85-90°C) the thermal switch opens and the fan shuts off.
Since the fan is governed by temperature the engine does not have to be ON for the fan to operate. If any underhood operations must be performed on a warm engine, disconnect the wiring harness to the fan.
COMPONENT LOCATIONCooling Fan Controller
The cooling fan controller is located either behind the left side of the instrument panel, or mounted on the right hand cowl panel under the dash panel.Cooling Fan Controller Module
The cooling fan control module can be found behind the right side of the dash panel.Cooling Fan Relay
The cooling fan relay is located in the air conditioning cooling fan control module.
- Make sure the vehicle is correctly filled with coolant.
- Check the fuse or circuit breaker for power to the cooling fan motor.
- Remove the connector at the cooling fan motor. Connect a jumper wire and apply battery voltage to the positive terminal of the cooling fan motor.
- Using an ohmmeter, check for continuity in the cooling fan motor.
Remove the cooling fan connector at the fan motor before performing continuity checks. Perform continuity check of the motor windings only. The cooling fan control circuit is connected electrically to the Electronic Control Module (ECM) through the cooling fan relay center. Ohmmeter battery voltage must not be applied to the Electronic Control Module (ECM).
- Ensure proper continuity of the cooling fan motor ground circuit at the chassis ground connector.
REMOVAL & INSTALLATION
- Disconnect the negative battery cable.
- Place protective covers on each fender.
- Drain the cooling system.
- Unplug the wiring connector from the fan motor. Disconnect the wire loom from the clip on the shroud by pushing down on the lock fingers and pulling the connector from the motor end.
- Remove the fasteners retaining the fan motor and shroud assembly and remove the unit from the vehicle.
- Remove the retaining clip from the motor shaft and remove the fan.
A metal burr may be present on the motor shaft after the retaining clip has been removed. If necessary, remove the burr to facilitate fan removal.
- Unbolt and withdraw the fan motor from the shroud.
- Install the fan motor in the fan shroud. Install the retaining nuts and washers or screws and tighten to 44-66 inch lbs. (5.0-7.5 Nm).
- Position the fan assembly on the motor shaft and install the retaining clip.
- Position the fan, motor and shroud as an assembly in the vehicle. Install the retaining nuts or screws and tighten the nuts to 31-41 inch lbs. (3.5-4.6 Nm).
- Install the fan motor wire loom in the clip provided on the fan shroud. Connect the wiring connector to the fan motor. Be sure the lock fingers on the connector snap firmly into place.
- Fill the cooling system with antifreeze.
- Reconnect the battery cable.
- Check the fan for proper operation. Make sure the coolant level is correct.