The evaporator fan should cycle off when the compressor and condenser fan motor cycle off. If not the evaporator fan will continue to circulate air into the fresh food section, the freezer section would therefore warm up, but the thermostat would not cycle the cooling back on because the thermostat is satisfied until the freezer runs out of cold air. It's plug n play SOS I don't know how it could be wired wrong, but nothing surprises me anymore.
Also what was the part number of the fan motor used in the first repair?
I'm not sure because the service guy bought it.