This part is attached to the compressor. It helps the compressor kick on and off while maintaining a constant temperature to keep things frozen in your freezer.
UNPLUG REFRIGERATOR. Carefully remove relay from the side of the compressor. You shouldn't need a tool to do this, if it is hard you can gently pry the edge with a flat head screw driver just to loosen. Unplug white and red wires from relay, noting that the white wire goes in the hole with a #2 stamped beside it. Shake old relay, if it rattles like a baby rattler then it's most likely the problem. Replace wires into the new relay and plug back into the compressor.