I have just managed to fix the blower in my 2004 Ford Focus. Only worked on number 4 which cuts out the AC. Garage quoted me £40 for part and £40 for labour. I brought a second hand resistor from these people (very helpful and only £10 plus VAT) http://www.breakeryard.com/view_supplier_feed...
. Arrived next day. To replace the old one you just remove the 3 screws under the glove box and pull the box out. In front of you will be a big barrel which is the fan. To the bottom right of this you will see the old resistor. This is held in by one screw. Remove this and pull out the fixed wires. Put in the new part, re attach the wires and put the screw back. Job done. Should take about 15mins.
Hope this helps somebody somewhere
Daren Hudson, February 2009