The overload protector is designed to protect the compressor motor from damage. The location of the overload protector is with the start relay on or near the compressor. The compressor is found at the lower rear of the freezer, with the exception of the high-end, built in style refrigerator-freezers on which the compressor is usually on top.
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 is accessed from the lower rear of the freezer. The compressor is labeled "A", the overload protector is located in the terminal box which is located at the position labeled "B".