If checking the fuses didn't work it could be the same thing that happened to my Mondeo.
The heater blower wouldn't work on speeds 1,2 & 3.
(4 was fine).
In the end I needed to buy and fit a a new resistor (the old one had melted).
I did the work but it wasn't easy (it needed a bit of rewiring, not just refitting(the resistor is located in the bottom of the heater duct in the passenger footwell - under the glove box)).
take care
DaveT
January 2005