I wrote this for another forum - have just copied it here. First off put the screws back that hold the fan in place then take a look at the text below - hope it helps.
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I am not an engineer but here's a spot of advice that would have helped me out during the fitting of the evap thermistor. Assuming all FF92s are the same:
With the power off, remove the internal housing at back of freezer compartment (8 screws). You then need to wriggle out the polystyrene panel (that holds the freezer thermistor) and then you are presented with an aluminium panel that covers the evaporator. You need to get this out of the way to get to the evap thermistor. TAKE CARE This panel is connected to a series of reasonably delicate electrical stuff (told you I wasn't an engineer!) which is essentially fixed to the back of this panel and the wires are threaded through various loops in the evaporator. Also if you have any ice build up then all of the above wires could be enased in ice. Thaw it out (if required) then move the aluminium panel as if you are opening a door towards you with it hinged on the right hand side - that way you shouldn't damage any of those wires. Then you can leave the wires connected and prop up the aluminium panel while you change the evap thermistor.
Hope this helps
Doug
December 2005