Are a pain in the...
Mum's went a few weeks ago, resulting in the fan not blowing above speed 1. So, misty windows in a morning, and litte if no air blowing around the car.
The resistor pack works off a thermal fuze, which, from all the cars I've trawled around at the scrap yard, appears to be a common fault.
Fortunately, further investigation has found that the thermal cutout is the same as ones in washing machines and tumble dryers. So Nige's got one at GT Electrical, and I've set to and fitted it to the pack this afternoon. Hurrah 
