its called a "blower motor speed controller" it is a solid state controller and its right next to the blower motor. when mine went out the speed would go up and down and when you shut off the EATC the blower would default to high. mine had a problem with condensation (i believe) forming on the underside of the air box dripping onto the "controller" so i made a small cover to keep water out, so far so good.
U sure ur weather stripping from the front cowl is in. Good shape