Driving back from work just now, the windscreen was a little misty so I put on the windscreen demist. The fan fired up at full speed, which I presumed was normal, however when I turned it off, the fan kept going. Turning off all the climate control functions didn't do anything. To my horror, when I arrived home and turned off the engine the fan was still going. Very frustrating, I've had to resort to pulling out the fuse, which was apparently the 'air conditioning' one.
Your ideas of cause and solutions will be greatly appreciated. Only had this car a few weeks and this is the second time it's gone wrong!