Product review (5 stars): Perfect part isolation choice for a refrigerator that runs inconsistently and requires "fiddling with the temp setting dial".
Relatively simple to install. UNPLUG THE FRIDGE.  Be careful not to kink the thermostat tubing or you will ruin the new part. You can prove the likely hood that this will fix you refrigerator by  connecting the two wires (NOT the green ground wire) together with the refrigerator unplugged. Insulate the connection with some electrical tape, plug it back in and let the fridge run for several hours. If it is getting cold again and can freeze a cup of water in the freezer, this would be a good choice to replace with a high likelihood of success. It fixed mine.