Uplander Rear Vent Stuck
 

Hey guys,

I have a 2009 Uplander LT Ext with 204 000 km on it. It has the rear heat/A/C vents that are controlled from the controls for the front. I have this issue where the rear vents only blow from the floor no matter which position you set the front to. At one point it did switch over to the ceiling vents and got stuck there. The front vents work fine, they switch to whichever setting you choose. it is just the rear vents that are giving me a problem.
I am thinking that it is the rear blend door actuator that has gone bad. My question is, does anyone know where it is located so I can change it? Or any other possible causes for this?

Thanks in advance,