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It sounds like your evaporator fan motor, they last about 4-5 years. Try to see if the buzzing noise comes from the motor, usually in the freezer compartment behind a vented cover plate
The freezer is usually cooled by the compressor, the fridge is then cooled by an evaporator fan motor ($30). If this fan seizes or slows down then the fridge warms up (it sometimes starts squealing before this happens). It could be that your drain hose is clogged or frozen. Maybe the temperature adjuster go bumped.
If you think it is the evaporator fan motor:
Check to be sure you can get a replacement fan first, they last about 4 - 5 years. Can get from a parts supplier or electric motor company.
UNPLUG fridge. Located usually in top of freezer behind a vented cover plate. Remove cover, remove screws holding fan in, may have to cut wires. Replace with new motor, make sure the fan pushes air into the freezer area and doesn't spin backward drawing air from the freezer area.
You have one of two problems going on. Your fan is spinning at hitting the sides. Or your compressor is shot which seems to be more the problem and even though it is cold the humming sound is a warning for you that the compressor is shot and it is more affordable to replace the fridge then the compressor. Sometimes compressor can cost more then the fridge.
from your description it sounds as if the compressor is not starting up. the buzzing noise usually occurs approx. ever 3-5 minutes and is followed by a click. this indicates either a bad start relay or a stuck compressor. and from the model you listed it is most likely the compressor. if the unit is under 5 yrs old it should still be in warranty thru sears.
Thanks for using FixYa Peyton
Buzzing is usually a fan, like one in the freezer, or back bottom - for cooling the freon. The compressor over-heat usually will make a single click (off) and a few minutes later a click (on). If the fan in the freezer stops working well, the freezer will frost up and the fridge section will not be cold enough.