Gelignite

My demister fan seems to have stopped working. I have the automatic A/C unit and all other controls work fine, except for the rear senser fan, but that doesn't seem to stop things working other than the temp is a bit erratic. I am plannig to take the unit out and try and fix that, when I can figure out how the release tools work!

I believe the demister has its own fan so does anyone know where this is so that I can check it out? Is it possible this not working is also related to the senser fan too because the upper temp control that governs the demister might be fooled?