Unit very noisy and freezer too warm

First I removed the racks in the freezer. The rack supports on the sides lift off without tools. The evaporator cover is at the back of the freezer. 4 phillips head screws. The cover lifts up then forward to expose the evaporator, evaporator fan and duct. The duct is held by 3 hex head screws. The evaporator fan is attached to the duct with a wiring pigtail to a plug. Unplug the fan and remove the duct. The fan is held by 2 hexhead screws. The new fan is put in place and assembly is simply the reverse of disassembly. The unit is quiet and cools properly now. The new part fit perfectly.