Oh sorry, totally different then, I suspect the switch is faulty, so it may be worth checking the switch out, if it's working on 3 then the resistor pack is ok, of course the resistor pack could just have failed on those two postions, but it's unlikely, on MK1 it ALWAYS fails totally, hence no position 1-3.

When the MK1's burnt out resistor packs, the immediate cause is actually down to poorly fitted pollen filters, due to the position of them they would let water past into the heater motor IF they were not fitted correctly, which would cause it to sieze and cause resistance= burnt out resistor pack, don't hear of it really on the MK2's.

Martin