Originally Posted by
dom14
Have you tried what Yendor suggested above?
If you did, then it may be worth pulling the blower fan unit out.
In, not so common cases crap can get into it from the top of the dash, and air inlet vent in the side of the blower fan unit, and possibly block the propeller and eventually cook the motor.
I've seen it as a common issue with Nissan Micra 1996 model, where the blower fan/motor unit cooked twice as a result of crap getting into it from the interior air intake opening, and once the resistor cooking itself(but still worked at the highest setting).