Unplug the Kenmore refrigerator from the electrical outlet.
Open the freezer door. Lift the shelves out of the freezer compartment. Slide the tray out of the bottom of the compartment.
Lift the light cover off the light bulb. Remove the bulb from its socket.
Remove the screws holding the rear inside freezer panel in place. Disconnect the grounding wire from the top of the panel. Lift the panel out and set aside.
Remove the screws mounting the defrost heater to the freezer compartment. Unplug the electrical wires from their sockets on the sides of the heater. Lift the heater out of the freezer compartment.
Position the new defrost heater inside the freezer compartment. Plug the electrical wires into their sockets. Install the screws holding the heater to the freezer compartment.
Replace the rear inside freezer panel. Install the screws holding the panel in place. Connect the ground wire to the top of the panel.
Replace the shelves and tray inside the freezer. Plug the power cord back into the electrical socket.