I have a 2012 Chevy Cruze 2LT RS that will not blow air from defrost. When on defrost the air blows from dash vents. Not 100% sure but don't think it is the door blend actuator because when I crawled under the dash it looks like it rotates in every position. I tried disconnecting the battery and reconnecting and resetting computer and this did not work. Is there anything else this could be?