Resistor pack is shot.  You should be able to access it from underneath the
dash.  I don't know about the Dak specifically, but it's normally right on
the bottom of the HVAC unit, or on the right side, accessible through the
glove box opening (once you remove the box).  It should have a multi-wire
connector (usually four wires) to it.  Unplug the connector, and the block
should unscrew from the housing.

bad resistor