Q: How to test and replace the engine cooling fan?
A: The Radiator Fan is controlled by a temperature switch mounted in the thermostat housing cover. When the coolant reaches a predetermined temperature, the switch opens the ground return for the fan motor relay, completing the circuit. First, check the fuses. To test the fan motor, unplug the motor connector and use fused jumper wires to connect the fan directly to the battery. If the fan still doesn't work, replace the motor. If the motor tested okay, the fault lies in the coolant temperature switch, the fan relay or the wiring harness. Test the temperature switch by unplugging the connector and bridging the terminals in the wire harness with the ignition switch On. If the fan does not operate, check the wiring and the relay. For replacement, disconnect the negative cable from the battery, then remove the air cleaner intake duct. Unplug the wires and detach the hoses, then unbolt the fan shroud at the top and bottom. Lift the fan assembly out of the engine compartment. Remove the nut and detach the fan blade assembly from the motor shaft. Take out the screws holding the fan motor to the bracket and detach the motor. Installation is the reverse of removal.