Unplug the wine refrigerator's power cable and turn the unit around so you have access to the rear panel.
Remove the screws on the back panel of the refrigerator. Remove the access panel to access to the internal components. Next to the main refrigerator compressor is the fan.
Remove the screws at the base of the fan.
Unplug the wiring harness from the rear of the fan and remove the fan from the unit.
Fit a new fan in the old one's place and replace the screws and wiring harness.