Hyundai 25231-2H000 Fan-Cooling

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The circuit for the radiator cooling motor is controlled by the radiator fan relay, which is controlled by the PCM. The PCM monitors engine temperature through the Engine Coolant Temperature (ECT) sensor. When the ECT sensor indicates that the engine is overheating, the PCM energizes the radiator fan relay, which turns on the circuit for the radiator fan motor. The circuit for the condenser cooling fan motor is controlled by the condenser fan relay, which is connected to the circuit for the AJC control relay. When the air conditioning system is turned on, the AJC control relay turns on the circuit that engages the compressor clutch, which activates the air conditioning system. When the AJC control relay is turned on, it also turns on the condenser fan relay, which turns on the circuit for the condenser fan motor. To test either fan motor, unplug the motor connector and use fused jumper wires to connect the fan directly to the battery. If the fan does not operate, replace the motor. If the fuse, relay, and motor are okay, but the fan doesn't come on when the engine is hot, the problem is in the cooling fan motor circuit or in the PCM itself. If the fuse, relay, motor, and fan motor circuit are good, have the PCM checked by a dealer service department. For the replacement process, the steps vary depending on the model and year of the vehicle.