The problem with the heater blower on your car is the rear stat which you will find under the glove box. There is a four wire multi plug going into the rear stat. You might find that the wires have melted/shorted and need repairing and rear stat needs replacing.
1. Unplug multi-plug.
2. Remove screws.
3. Remove rear stat. When you take this out it should look like a big green square resistor. This is your rear stat. You should get this from a Ford dealer for around about £14.
Refit new stat in reverse order, not forgetting to repair wires if necessary.
Rob
March 2006