Turn off your Viking refrigerator, unplug it, and move it away from the wall.
Remove the screws on the access panel located at the rear of the refrigerator. This panel will be located near the bottom of the unit.
Remove the panel to expose the internal components of the Viking. The fan assembly will now be visible, mounted next to the basketball-sized condenser.
Unplug the wiring harness connected to the fan assembly.
Remove the mounting bolts holding the fan in place with a wrench.
Remove the fan assembly from the unit.
Fit a new fan in the compartment and replace the mounting screws and wiring harness.
Replace the rear panel of the refrigerator.