My fridge and freezer were not getting cold enough.

The Fridge and freezer were not very cold except for in the very back of the freezer (where the coils are). So I opened up the back of the freezer by first removing the dome light cover and removing all the visible screws. I then lifted up and pulled out the vent in the center of the back panel and removed the two remaining screws on the back panel. At that point I removed the back panel exposing the coils and fan. I saw that the fan was not spinning so I used a screw driver to manually turn the defrost timer found on the top of the inside of the fridge. Once I had turned the defrost timer once complete rotation, and the fan didn't turn on, I was pretty sure that it was the fan. I still wasn't sure that the fan was the only problem, but I couldnt see anything else that wasn't working properly. I decided to take a chance and order the fan motor (not the entire assembly. it is easy to replace the moter only leaving the original fan blades and housing). Once I got the part, I unplugged the old fan motor, put in the new fan motor, and pugged it in and it started spinning right away. I put everything back together the same way I took it apart and it has worked great ever since.