It is located behind a detachable panel that can be removed from inside the freezer part of the fridge. The panel is held on with 6 screws. Behind it is a polystyrene panel that simply pulls out. Behind that is a metal panel that needs to be removed. Pull it from the left side as there are some wires attached to the bottom right of this panel. Move it out the way and you will spot the yellow plug of the thermister. Replace it with your new one and marvel at how you repaired your own fridge for the cost of the parts.
Clever Dick, April 2010