Hyundai 25231-24000 Fan-Cooling

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On 1986 through 1994 models, the Cooling Fan Assembly is controlled by a temperature switch mounted in the bottom of the radiator. When the coolant reaches a predetermined temperature, the switch closes, turning on the fan motor. On 1986 through 1989 models, the switch completes the ground circuit for the Cooling Fan Assembly motor. On 1990 through 1994 models, the switch provides power to the cooling fan relay control circuit. The cooling fan relay connects the fan motor to ground and the fan runs. On 1995 and later models, the cooling fan relay is controlled by the ECM. The ECM uses information provided by the Engine Coolant Temperature (ECT) sensor to operate the Cooling Fan Assembly. First, check the fuses. To test the fan motor, unplug the motor connector and use jumper wires to connect the fan directly to the battery. If the fan does not operate, replace the motor. If the motor tested good and does not operate under normal conditions, the fault lies in the coolant temperature switch, cooling fan relay, the ECM or the wiring harness (as applicable). Test the temperature switch by disconnecting the electrical connector and bridging the terminals of the switch harness connector with a jumper wire. Turn the ignition switch On, if the fan motor now operates, the switch is probably defective. Further testing of the switch can be accomplished by checking for continuity across the switch terminals with the coolant cold and again hot. Or remove the sensor and suspend it in a container of water and check it while heating the water. Replacement involves removing the radiator, with the Cooling Fan Assembly(s) attached, from the vehicle. Remove the bolts and separate the fan/ shroud assembly from the radiator. Remove the nut and detach the fan blade assembly from the motor shaft. Remove the screws and detach the fan motor from the shroud. Installation is the reverse of removal.