Freezer thawing at about 20 degrees

Turned freezer off at themostat and unplugged freezer. Removed 2 screws at front 2 at the back and 2 at the top. Lowered top cover and removed evaporator fan bracket (2 more screws) removed themostat capulary tube( 1 screw and bracket) then unplug fan motor. Removed motor from bracket (2 screws). Put on new fan motor then removed fan blade from old motor and put on the new motor. Remounted fan motor bracket and thermostat capulary tube. Remounted top cover, plugged freezer in the set the thermostat to 4 and freezer is working fine and doing its job. I orderedmotor on a Sunday and it was shipped on Monday and I received said part at 7:pm on Wednesday.