We just bought a 2007 SEL and I can't seem to get the rear heat/AC vent to work on all the settings that the owners manual says they should work on. If I turn the control to the left, one of the settings will open the rear vent and blow air out but if I turn the control to the right where I should have two settings that allow air to go to the rear vent, I get nothing.  
  
Am I missing something  ?  
  
Here is what the manual says; 
  
:Distributes air through the instrument panel vents and center 
console vents. 
  
: Distributes air through the instrument panel vents, center console 
vents, floor vents and rear seat floor vents. 
  
O (OFF): Outside air is shut out and the climate system is turned off. 
  
: Distributes air through the floor vents and rear seat floor vents. 
Note: You may notice a small amount of air flowing from the defroster 
vents and demister vents. 
  
: Distributes air through the windshield defroster vents, demister 
vents, floor vents and rear seat floor vents 
  
  
Thanks for any help you can give