Recently, I've been unable to direct air flow to the floor or windshield (MFD icons won't redirect to floor or windshield when pressed). Hot / cold air does flow from the dash vents. An independant HVAC shop found a B1433 code, and recommended I take it to a dealer for repair. The car has 200500 miles and runs great otherwise. Can anyone guess what I can expect to be charged for this repair?