The Radiator Fan Motors are controlled by the Engine Control Module (ECM) through the Intelligent Power Distribution Module (IPDM). Either the ECM is not turning ON the fan motors, the Cooling Temperature Sensor is not working or there is a problem with the IPDM. You need to check with an OBDII scanner if the ECM is commanding the fan motor is to turn ON and if the Cooling Temperature Sensor is sending the proper signal to the ECM.
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