A noisy refrigerator can be an annoying issue. Every time the fridge begins to cycle through its cooling phase, the compressor and compressor fan kicks in. If one of these components is loose or faulty, your fridge will make loud noises. A new compressor is very costly and usually means it's time to purchase a new refrigerator. A fan and fan motor are cheaper to repair, however, and you can do the job yourself.
Open the freezer door. If the noise gets louder when the freezer door is opened, it's likely the compressor fan.
Unplug the unit.
Remove all the food from the inside of the freezer and allow it to thaw.
Remove the screws holding the back panel of the freezer on. Pull out the panel.
Remove the nuts holding the fan in place using a nut driver. Pull out the wire connectors from the fan motor.
Remove the screws holding the fan to the bracket. Tighten the new fan onto the bracket and screw it to the back of the freezer. Replace the panel and plug the fridge back in.