Unplug the refrigerator from the wall outlet.
Remove the screws securing the control panel to the roof of the fresh food cavity. Lower the control panel.
Pull the temperature knob off of the thermostat and out of the top or front of the control panel, depending on the model.
Remove the screws or depress the tabs, depending on the model, securing the thermostat to the control panel housing.
Remove the thermostat and temperature sensing tube from the control panel housing.
Note location of the wires connected to the thermostat control. Remove them from the thermostat.
Pull the insulator off of the old temperature sensing tube to the new temperature sensing tube, if applicable to your model.
Connect the wires to the new thermostat.
Align the temperature sensing tube with the channel in the control panel housing. Secure the new thermostat using the screws or tabs.
Reinstall the temperature knob.
Secure the control panel housing to the roof of the refrigerator, using the screws that were removed.
Plug the refrigerator back into the wall outlet to complete the repair.