My '99 Durango blows air fine and at what appears to be full force when the switch is to the defrost. When the switch is moved to the defrost/lower front (feet and leg area) selection or just to the feet and leg selection no air comes out those vents under the dash. I think my problem is that the vents are not opening or the air is not being directed to those vents. I have not looked under the dash yet. Is this a vacuum system or a manual cable operated system? Or is it electical? I am hoping that something just came unhooked. Any direction regarding where to start looking would be appreciated.

 

it sounds like you have a cracked vacum line (controls the door positioning) or a jammed blend door

 

+1 on the blend door.

 

The person above me has been hanging out with hydra too much, hitting the pubs early.
Blend door has no control over the vent flow location. Your problem is vacuum related, it may be as simple as the line on the engine bay firewall/leak at the control, or harder a leak behind the dash.
The vacuum is pulled from your engine, into the dash (under the heater core lines in the engine bay), the switch on the dash directs the vacuum to the appropriate settings and pulls a diaphram that open/closes a certain valve

 

Whats wrong with helping the local bar stay in business? They gotta make a livin too!

 

I concede to your infinite knowledge, o Duranged one. Besides, I don't drink. If I did, hydra would have drunk me under the table in the first hour!

 

i think the only person on this site with a chance at keeping up with hydra is hammerz71, but he doesnt tend to post when hes drunk . . .

 

And that's why he posts more during the day.......LMAO!

 

Is he as knowledgeable as you? If so, then we have the whole 24 hrs a day covered! Oh yeah, Indy can take over if anyone needs a break!

 

ummm you forgot about someone