On the 2009 Chevy Traverse, when the air flow will not switch direction according to the control panel selection, this is most commonly due to a faulty Mode Door Actuator Motor. This actuator is when “turns” the door inside the HVAC housing to redirect air flow. Carefully inspect the electrical connector and wire harness for any loose, broken or damaged wires. Remove the Actuator and inspect the mount on the housing for any broken parts. If the visual insepction checks ok, replace the Mode Door Actuator. To gain proper access, remove the passenger’s side silencer panel (the one right above where the passenger’s feet would be) and removing the glove box helps a great deal as well.
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