All front vent will only blow warm air.
I also have a 2011 traverse. The problem I am having is it will only blow warm air out of front vents. I know it is an actuator problem and I am willing to fix myself. Just need to figure out which one it is. Please help
This Video might help you quite a bit.
I think these actuators are about $40 online and $80 at the dealer. You'll need a trick tool--a swivel head on a screwdriver with a T20 Torx taped to it should do it.