heater blower fan stopped working?

Ny blower fan for my mk2 mondeo stopped. It went through a stage where it would only blow on setting 4 on the knob thats both setting 4's. now it doesn't work at all. I have changed the unit onf control's behind the dash,changed the relay under the dash fuse is good oh and the light does work on the aircon. Anyone any more ideas would be greatfull.

rewgards nigel