It is very often a noise of the evaporator fan blocked with ice. The reason is – defrost system malfunction and evaporator freeze-up. However, sometimes the Frigidaire refrigerators fan gets blocked due to water leak when filling the ice maker. Faulty components of the defrost system can be: defrost thermostat, defrost heater, defrost sensor, temperature sensor, defrost timer, electronic control board. The clog in the drainage system can also cause fan blockage. Besides mentioned above, the noise can be produced by engine bearings of evaporator fan or condenser, overheated compressor, broken water valve or air damper. The thorough diagnosis is mandatory to fix the noise because the longer malfunction continuous the more expensive repair it will require in the future.