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Old 07-30-2010, 10:31 AM   #1
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Climate control, 05 TJ

Now, I don't need AC, but during these high humidity days I like to run the AC for just a few to blow out all the hot air in the cab. Just a minute or two then it is tolerable. Well, turned it on the other day and on every setting it blows out of the defroster. Any clue, because I don't have one. The fan switch already only worked on the 3rd and 4th selection. Gets pretty cool, just from the wrong spot. Anyone have a spare climate control module?
Chris


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Old 07-30-2010, 10:57 AM   #2
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It's a common problem on TJ's. I've seen it a lot on the '05's for some reason. Search around here and you'll find that it's probably a vacuum hose thing, or the switch itself, iirc. If you don't find anything I'll look later. I am ignoring the million things I should be doing instead of spending time here at the moment...

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Old 07-30-2010, 11:38 AM   #3
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As indicated, it is a vacuum or switch problem. The bottom line is defrost is the default position in most/all vehicles, that way if there is a failure of the system, as you have, you can clear the windshield for safety.
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Old 07-30-2010, 01:17 PM   #4
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I'm inclined to go with your vacuum input. I know the other day when I got in the jeep it was already in the defrost position (not sure why) and when I went to switch it to the AC position I never heard the sound that comes from behind the dash and of course the air continued to blow from the defrost ports.
Neil, when you say bottom line, are you referring to location when you pull it out of the dash and look at it? heck, maybe one just came loose somehow??

Thanks for the input folks.
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Old 07-30-2010, 04:22 PM   #5
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I dealt with this same thing in the spring. Mine was a vacuum leak. About a month after that, I had to have a new AC condenser - to the tune of $400, installed.
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Old 07-30-2010, 07:06 PM   #6
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Hey Mike, were in the system was your leak located?

Thanks, Chris
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Old 07-30-2010, 07:23 PM   #7
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on the fire wall on the passenger side you'll see some lines going into the firewall and also splitting off to the drivers side. trace them to the drivers side to find the loose end of your vacuum line. it should plug into a hard to see port coming off the engiine about halfway along the engine. Mine was still all loose when i reattached it so I stuck a worm clamp on it, been fine since then.
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Old 08-01-2010, 12:34 PM   #8
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Good call guys, all fixed. The vacuum line did pop off at the intake manifold. I'm amazed these don't come off more often, no tension at all. I slipped it back on and put a zip strip on it, shouldn't come off again. Thanks for the input. chris
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Old 08-01-2010, 01:24 PM   #9
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^^^^ only working on setting 3/4 is the blower reostate/resister...change it out and you'll have all the speeds back.


And for others with same issue "i only have defrost"

Yes very common issue.....look at these thre vaccume lines....common for one to pop off...
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Old 08-01-2010, 01:29 PM   #10
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^^^^ only working on setting 3/4 is the blower reostate/resister...change it out and you'll have all the speeds back.
...
Where is this located? Thanks
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Old 08-01-2010, 01:47 PM   #11
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I had the opposite problem with no defroster and every thing else working. On the floor next to the accelerator pedal there are 3 or 4 vacuum lines going to a control just to the right hidden behind the panel, check to see if any of those came off, I found that was the problem with mine after I tested the vacuum and removed the battery etc. so I could get to the canister.


edit: oops didn't see you already had it fixed.
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Old 08-01-2010, 05:35 PM   #12
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Where is this located? Thanks
You can see the resistor/harness and the little red lock. The red lock only slides out a little bit to allow you to push the release "lever". Needle nose and a nice steady pull work for the lock. You can also notice why unscrewing the foot light is helpful. Disconnecting the green plug and sliding it off it's mount will also give you some more slack and room to work.



You can see the location of the two screws that hold the resistor the the duct in this pic.




this is under the passenger side dash

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