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AR15.COM
2/25/2012 11:10:10 AM EDT
2001 Pontiac Grand Prix with dual climate control.

A couple of months ago it stopped moving between defrost, vent and floor and got stuck somewhere in between and was coming out of all three.  Wasn't an issue as it still a heated and cooled the car just fine.  On the way to work yesterday it stopped coming out of anywhere.  Blower is still working fine.  I crawled around under the dash and can't find anything loose or disconnected.  

Any ideas on where to go next?  Is it vacuum driven or is there an actuator back there?
2/25/2012 12:44:24 PM EDT
[#1]
Should be an electric driven servo of some type.  A little box about the size of a pack of cigarettes that has a little electric motor and gear box.
2/25/2012 3:41:51 PM EDT
[#2]
Pulled the actuators under the dash and they are both working.  Started chasing a vacuum line behind the battery and it came apart in pieces.  May be the culprit.  Off to the parts store.