If you mean it blows through the dash vents or defrost vents but does not change to the floor vents then you have either a mode door actuator or mode door failure.
Not a hard repair. Basically you put the passenger seat back, go into the passenger footwell. Remove the heat duct extension from the end of the HVAC case with a few screws. Right above it will be the mode control actuator. Remove the screws securing it, rotate it out so you can see the drive, now switch from defrost to vent to floor. If the actuator motor does not move, it is bad. If it does the door inside the case has failed. That is a bit harder to change.
Saturday, December 31st, 2016 AT 12:58 AM