My freezer is working but my fridge is not. GE

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Check to be sure you can get a replacement fan first, they last about 4 - 5 years. Available 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 spins the same direction (CW OR CCW) as your old one, if you don't know which way it should spin then be sure it pushes air into the freezer area and doesn't spin backward drawing air from the freezer area..