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Unread 07-17-2010, 08:27 PM   #1
Tassadar
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Join Date: Aug 2003
Location: Davenport, IA
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Air flow problem...

Well, my Jeep Wrangler suddenly started to have problems with air-conditioning air flow. The air seems to come out the bottom (feet) portion only. Turning the knob will not cause the front portion to fire up. Turning the knob to any of the positions does not matter. But here is the odd part, occasionally when starting the Jeep, the air will kick out the front on it's own (ie. when air conditioning is on).

Now I do not think it is a disconnected hose (I think!) because if it were so, when I turn the knob from "feet only" to "front only" should cause the air flow on the feet region to go off or at least slow down. But the flow does not modulate at all... I am not sure where/what to start looking at. Please advice

CC

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Unread 07-17-2010, 10:16 PM   #2
cntp
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2001 TJ Wrangler 
 
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Location: Greenville, NC
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There is a little door valve thingy (I can only think of "Blend Door", but I think that's the one that controls heat vs ac), way behind the dash somewhere I'm sure, that controls where the air goes. It's vacuum operated I believe. It's default position (I think via a spring) is defrost, then going to floor and then dash vents. My guess, either this door is stuck, or you've got a vacuum leak that is not allowing it to turn all the way to dash vents position.

On my old Grand Cherokee, I had a vacuum leak somewhere (never took the time to find it), so if I was crusing down the highway and hit a hill, the A/C would move from the dash, to the floor, to defrost, depending on how steep the hill was. Once I was at the top of the hill, it went back to the vents
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Unread 07-17-2010, 10:23 PM   #3
thirdeye
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Keep the A/C in the off position and take off your doors and top!
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Unread 07-17-2010, 10:27 PM   #4
Mino
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2005 TJ Wrangler 
 
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This happened to me before when I accidentally disconnected a vacuum hose right under my throttle body. Check it out. Good luck.
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Unread 07-18-2010, 12:57 AM   #5
Sccafire
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Quote:
Originally Posted by cntp View Post
There is a little door valve thingy (I can only think of "Blend Door", but I think that's the one that controls heat vs ac), way behind the dash somewhere I'm sure, that controls where the air goes. It's vacuum operated I believe. It's default position (I think via a spring) is defrost, then going to floor and then dash vents. My guess, either this door is stuck, or you've got a vacuum leak that is not allowing it to turn all the way to dash vents position.

On my old Grand Cherokee, I had a vacuum leak somewhere (never took the time to find it), so if I was crusing down the highway and hit a hill, the A/C would move from the dash, to the floor, to defrost, depending on how steep the hill was. Once I was at the top of the hill, it went back to the vents
That would be called the "mode" door
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