The overload protector is accessed from the lower rear of the refrigerator. In the photo below, the compressor is labeled "A", the overload protector is located in the terminal box which is located at the position labeled "B".
Before testing the compressor motor, unplug the freezer to avoid an electrical shock hazard. Also, if the compressor uses a capacitor, it may contain a lethal electrical charge. Do not touch the terminals until you have discharged the capacitor.
The overload protector can be accessed by removing the terminal cover box. The cover is held on by tension or with a retaining clip.