side by side freezer fan funs most the time

I cleaned compressor, fan, coils underneith. Ice outlet working. Door seals fine. Light switch works. The compressor cycles on and off. The fan in the freezer runs alot with or without the compressor running. I here the door between the 2 sides opening and notice cool air ciming into the fridge, and then, it closes and no cool air, but fan still runs. Freezer keeps a good 0 degrees, fridge keeps 34 to 40 degrees. The freezer is set at factory, fridge is set a little cooler than factory setting. Compressor was replaced when 5 years old.
Thanks.

It sounds to me like everything is working as it should. The evaporator fan is running to cycle the air and regulate the temp inside the fridge. The temp readings you gave are good. Hope this helps.