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Old 09-09-2010, 11:43 PM   #1
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No control of hvac vent select

So my heat and ac work. Fan speeds, all four, work. However I cannot get my hvac to blow through any vents but the defroster. No matter how I turn the vent selector the vents remain on defrost only. I checked the vacuum line going off the top of the engine and it is still snug in place any ideas?

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Old 09-10-2010, 06:27 AM   #2
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I believe there are multiple vacuum lines. My Ram van has 6 going to different points. Everyone of them cracked or broke at one point. Lost control of vents. Never had the problem on the jeep. But there are multiple lines. You have to trace all of them. Most leaks are under hood so don't go tearing apart your dash until you exhaust all leads. The dash may be suspect if you had any work done in it like changing radio ect..

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Old 09-10-2010, 06:30 AM   #3
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Not that the radio has anything to do with it. But any work under dash may have pulled loose or damaged vacuum line
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Old 09-10-2010, 06:34 AM   #4
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Nothing has been touched under the dash for almost six months.
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Old 09-10-2010, 06:39 AM   #5
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What kinda jeep?
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Old 09-10-2010, 07:49 AM   #6
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I had this happen to me. Turned out to be a broken T-connector for my vacuum lines under my hood near the firewall. This was on a different vehicle but I'm confident your issue is vacuum-related as well. So, check your connectors as well as your lines.
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Old 09-10-2010, 02:58 PM   #7
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My 97 had a tsb on the same issue, and it is the lever that connects to the vacuum dashpot. The lever actuates the blend door, which directs airflow out the dash vents. I called jeep on this and they will not honor ANY of the recalls and tsb that the po did not take care of. The lever is not easy to locate if this is your problem, I still have not located one.
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Old 09-10-2010, 03:29 PM   #8
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This may be a shot in the dark but it seems like I pulled the dash on a cherekoo and the ac controls have vacuum lines runnin to them. That may be ur "lever" dunno though.
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Old 09-10-2010, 04:29 PM   #9
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Old 09-10-2010, 04:33 PM   #10
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Happened to me...turned out it was a bad knob...make sure the know is actually turning. Mine was cracked on the back and was just spinning.
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Old 09-10-2010, 08:10 PM   #11
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It's a 06 X. Lots of good ideas gonna take the dash apart tomorrow and check all the vacuum lines
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Old 09-10-2010, 08:49 PM   #12
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I had this happen to me and it ws the blender door was stuck. The vacum control was under the dash driverside I helped it out and it started to work again.
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Old 09-13-2010, 01:32 PM   #13
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i have a 02 sahara...having the same issues with middle dash vent...all others work fine. Does anyone know were the blender door or lever is on this ?? thanks in advance
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Old 09-13-2010, 07:01 PM   #14
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The venting system in the TJ (at least my 1999) is vacuum controlled. Any loss or leak in vacuum suction and the vent control door (not to be confused with the blend air door) defaults to defrost. Start at the engine block on the driver side and find the small 1/8" plastic hose the runs over and splits next to the battery. One lead goes to the vacuum reservoir which is under the battery, and the other split goes into the firewall by the AC hoses. Most likely you have an issue in the engine side of the firewall. Also, cracks can develop in the reservoir under the battery tray. This often manifests itself as your air going to "default" when the engine is under strain (hill climbing) but then goes back to normal on the downhill. These reservoirs are hard to get to.

If I recall, the blend air door (heat/cold) is motor controlled. The plastic geared spindle often breaks and the blend air door sticks. The motor/spindle is located (on my 99) above the passengers left ankle up under the dash. Easy to get to and repair.

Recently, my AC defaulted to defrost because acid from my battery spilled out and melted my vacuum hoses. So I definitely had a vacuum leak! Hope this helps. YMMV... CG
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Old 09-23-2010, 06:29 PM   #15
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Where can I buy, or repair myself, the little rubber piece at the end of the vacuum line? I have the line under the battery just hanging there loose; do I have to take the battery out to fix this, and what do I replace that rubber piece with?
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Old 09-23-2010, 07:14 PM   #16
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Well, 20 minutes later, and the problem is fixed! Right under the battery there is a small canister inside a fender hole, and the vacuum line just wiggles on. I spliced another vacuum piece on the end, wiggled it back into place on the vacuum reservoir. THANKS for the postings, as my wife was determined to spend up to $350 to get the ac fixed. I am presenting my bill to her this evening when she gets home...half price!
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Old 09-23-2010, 07:17 PM   #17
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I just fixed mine earlier this week. Same thing, vacuum line under the battery was hanging loose. I trimmed the cracked part off, and felt around and pushed it onto something that it fit over. Hopefully it's in the right place, either way, it's working. :~)
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Old 09-24-2010, 08:31 AM   #18
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Found my vacuum leak thanks to all of your suggestions....!!! I did as was suggested and follwed the thin plastic air line.....for me I found it near the battery and worked my way back along the firewall to the engine block. The end of the hose was dangling not too far from the engine block attachment area. SCARY EASY...but not without all of your help. Thanks again.
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Old 09-24-2010, 09:33 AM   #19
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Thanks guys for replying what the fixes were. We have now all been taught something instead of left wondering the outcomes.
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Old 09-25-2010, 12:59 PM   #20
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Those of you with vacuum line problems are the lucky ones. I took a chunk of my dash out and found 2 of the black plastic elbows that connect the actuators to the vent door are broken off at the vent door. Any one out there ever replace one oh those? I'm thinking it will either be super glue or some major dash removal to replace the vent door module. I will probably start a new thread with pics....
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Old 10-19-2010, 02:00 PM   #21
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I have the same problem on my 97 wrangler. I've also been looking for one. I just saw one on Jeep.com for 13.90 I have not ordered it yet though the only other place I had found was $30+
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Old 10-19-2010, 04:32 PM   #22
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Only problem I have with my Wrangler's A/C is that it seems that it blows through all the vents on all settings, but won't blow through anything on defrost. Also, I haven't really given the jeep time to warm up, but it doesn't seem to blow out hot air.
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Old 10-25-2010, 07:34 PM   #23
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Quote:
Originally Posted by Jollyczar View Post
Those of you with vacuum line problems are the lucky ones. I took a chunk of my dash out and found 2 of the black plastic elbows that connect the actuators to the vent door are broken off at the vent door. Any one out there ever replace one oh those? I'm thinking it will either be super glue or some major dash removal to replace the vent door module. I will probably start a new thread with pics....
Just found the same thing. what did you end up doing?
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Old 06-21-2011, 05:44 PM   #24
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Quote:
Originally Posted by Billytehbob View Post
Only problem I have with my Wrangler's A/C is that it seems that it blows through all the vents on all settings, but won't blow through anything on defrost. Also, I haven't really given the jeep time to warm up, but it doesn't seem to blow out hot air.
Did you ever figure this out? I believe I have the same problem..
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Old 06-21-2011, 06:51 PM   #25
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Quote:
Originally Posted by 4X4DVL View Post
Well, 20 minutes later, and the problem is fixed! Right under the battery there is a small canister inside a fender hole, and the vacuum line just wiggles on. I spliced another vacuum piece on the end, wiggled it back into place on the vacuum reservoir. THANKS for the postings, as my wife was determined to spend up to $350 to get the ac fixed. I am presenting my bill to her this evening when she gets home...half price!
Looks like someone is going to get $350 in mods to their jeep!
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Old 02-05-2013, 11:09 PM   #26
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Quote:
Originally Posted by Jollyczar View Post
Those of you with vacuum line problems are the lucky ones. I took a chunk of my dash out and found 2 of the black plastic elbows that connect the actuators to the vent door are broken off at the vent door. Any one out there ever replace one oh those? I'm thinking it will either be super glue or some major dash removal to replace the vent door module. I will probably start a new thread with pics....
Yeah, I've done it a couple times. The dang things keep breaking on me! http://www.wranglerforum.com/f5/dash...al-144267.html That's a link for a write up I did on how to take the dash out when I fixed it the first time. You just pop a new one in you don't have to take it out, but it can be a pain.
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Old 02-05-2013, 11:16 PM   #27
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Originally Posted by gpzjack
Happened to me...turned out it was a bad knob...make sure the know is actually turning. Mine was cracked on the back and was just spinning.
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I learned the hard way if its below freezing don't force the knob. That knob got swapped with the temp comtrol

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