Hi, I had the same problem last week. I bought a heating resister from Ford which cost me just under £8.00 and fitted it myself within minutes!
It should be located just under the glove box, on the right hand side.(Its a rectangle black box) It is held in place by one screw and will just fall off for you to replace.
Just unconnect the old one, and push the connector into the new resister and the blower should work.
Sam, January 2007