The cooling fan motor is the electric power unit that spins the radiator fan blades. It converts electrical energy from the car’s battery into mechanical energy to generate airflow. These motors are designed to withstand high under-hood temperatures and continuous operation cycles. Over time, the internal brushes or bearings can wear out, causing the motor to seize or run noisily. A failing motor will prevent the fan from spinning, neutralizing the cooling system’s ability to lower engine temperatures while the car is stopped.