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Old 06-24-2010, 02:57 PM   #1
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Vacuum lines

Hey guys, I know this question has been beat to death... but I got a little problem lol

My 02' TJ is having that issue where the air only comes through the defrost vents and I know it has to do with my vacuum lines. However, this is my first Jeep and I know absolutely nothing about its a/c unit. Is there any way someone can post up a diagram of the vacuum lines so that I can know where to start looking?

I can even post up a picture of my engine bay and you guys can simply just highlight the lines on paint or something.

Any info at all would be great.

Thanks again,
Kevin

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Old 06-24-2010, 03:20 PM   #2
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Alright, so I think I found the problem but I still need the solution.

I noticed one of the lines [the one under the battery] is a bit cut up and comes off easy. I also found another hose next to it that's coming from the firewall that shoots out a lot of air. I dunno if that's supposed to be like that or it's supposed to be connected to something. It's about 5in long and is pointing down.

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Old 07-09-2010, 10:56 AM   #3
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I have an 03 Wr. SE and noticed the same thing. My AC isn't running right and I've been told that vacuum lines are the culprit. I cannot find where this line is supposed to go, but has a split end, so I'm assuming it went somewhere.

Too bad a schematic of the vacuum lines does not exist.
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Old 07-09-2010, 12:24 PM   #4
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A real easy way to find under-dash vacuum leaks is blow cigarette smoke through the line that goes through the firewall and watch for smoke under the dash.
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Old 07-09-2010, 01:13 PM   #5
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The hose that shoots air may be the drain. I don't think any vacuum lines shoot air. Fix the cut line get it back together and check. Unless you went under the dash for something and broke a line The problem will be under the hood.
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Old 07-09-2010, 04:57 PM   #6
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Quote:
Originally Posted by glpatton View Post
Too bad a schematic of the vacuum lines does not exist.
The Factory Service Manual has everything you need to know about your year jeep including the vacuum line schematic. Check ebay
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Old 07-11-2010, 12:24 PM   #7
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Same problem on my Sahara, though I saw a post which said it may be a connection on the back of the selector switch.
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Old 07-12-2010, 07:33 AM   #8
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I fixed it on my '03 Wrangler.

Trace the line from the driver side to the pax side and you'll discover the end (well, depending on your model I suppose). If the end is just hanging there, plug it with a screw and tape it tight--the system will work.

This is what I ended up doing and all is fine; plus the engine runs better. I'm still going WTF?
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Old 07-12-2010, 11:52 AM   #9
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Had the same problem on my 05. The air would only come throught the defrost vents and the cruise control wouldnt work. Vacuum line was off on drivers side. Put it back on and all works well
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Old 08-15-2010, 05:42 PM   #10
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Where does the vacuum line go???

On my 05 TJ the vacuum line that runs the vent selector is just hanging under the hood on the drivers side. Where does this thing go? I can't find the vacant nipple?

Please disregard, I found the culprit. Nipple on my 05 was on the side of the mainfold next to throttle body. Connected, wire tied, works perfect! Thanks to all.
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Old 08-17-2010, 09:42 AM   #11
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Mine is hanging lose on the passenger side with no apparent nipple to attach to. I inserted a screw, taped the screw in place and retaped the whole thing. Works like a charm. I then taped it to the support bar going back to front.

Now I will look for a nipple on the throttle body, again in case I missed it. Not obvious.

This is a simple set up that Jeep has made complicated. Like to smack an engineer.

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