I have a 56 plate Focus and my fan works on positions 3 and 4 but does not work in positions 1 or 2. The aircon light comes on in positions 1,2,3 and 4 and goes off in position 0. The fan sounds normal on positions 3 & 4. The aircon works fine. There doesn't appear to be any damp and the pollen filter was changed by my local garage on the last service 8 months ago.

I've read through all this thread and it seems my resistor is OK as it works on position 3. And I would have thought the switch is OK as the aircon light comes on - unless its on a separate pole.

Any advice on what to try first

Thanks
Richard