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Unread 05-01-2013, 05:35 PM   #1
atldude
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Mysterios vacuum in the cab.. Anyone know what it is?

Today i pulled the ac in the cab to check on things and the next drive i heard hissing. Took it down and found these bad boys sticking out and hissing:



Shortly after investigating where they could possibly plug into i found this hanging on a single screw half ay undone:



They are located right below the heater controls and just curious what they are for and how do i assemble properly. Definitely clear that the plastic piece hooks up to the hose but is there something the plastic piece should fit onto?

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Unread 05-01-2013, 05:39 PM   #2
zeus87gn
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The plastic block mounts to your heater control device
It moves an air diverter flap in your heat system
Yes, it should be there
Sorry, i cant take a pic of the one i have right now to show you
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Unread 05-01-2013, 05:42 PM   #3
atldude
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No need i see what u mean seems like when i move the vent control a little 'trigger' may push the switch in or let it all out. Hmm gotta find another screw now lol. Doesn't appear like its making real good contact ...
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Unread 05-01-2013, 05:47 PM   #4
atldude
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One more question. There supposed to be 2 or 3 tubes coming in? I only have 2?! But the plastic piece has 3 inlets and so does the connector...
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Unread 05-01-2013, 06:22 PM   #5
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Wait maybe i got it all wrong. Sound like from this post that the vacuum lines are supposed to control the left cowl gate (though looks like the right one ) how does that happen?

Edit link:
http://www.wranglerforum.com/f8/yj-h...ned-68618.html
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Unread 05-01-2013, 08:02 PM   #6
atldude
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Eh nevermind i figured it out..still don't know what its for.. Guessing it changes the vac if the gates are open in certain position? Maybe cause it to rev up a little ?,Lol don't know but thanks for the help got it all put together. Apparently only 2 tubes and the third one is left open.
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Unread 05-02-2013, 12:22 PM   #7
zeus87gn
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Thats right - one tube is the source the other is the signal
I believe it closes an air inlet flap when you move the lever to the off position
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Unread 05-02-2013, 02:29 PM   #8
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looks like something I get to do this summer because right now, all I get is hot air and its not a good thing in SW FL in the summer....
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Unread 05-02-2013, 04:18 PM   #9
atldude
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Quote:
Originally Posted by flcracker
looks like something I get to do this summer because right now, all I get is hot air and its not a good thing in SW FL in the summer....
Bet ur gate's prolly not opening properly take the heater out clean it, reseal it rehook the control wires and u'd be all set. did that in feb due to leaking heater core but did not deal with the controls and should have as u can see
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Unread 05-02-2013, 06:10 PM   #10
87TPIYJ
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I don't have any vacuum lines running to mine and it seems to work fine!?!?
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Unread 05-02-2013, 07:04 PM   #11
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Maybe it comes on certain years? Check out the link i posted earlier might be more info there. Maybe its been capped off at the source? Comes through a hole through the firewall above the ac drain in the center somewhere.. Should be a green one and a black one but i think they go through diff holes on the fwall.
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Unread 05-02-2013, 07:28 PM   #12
87TPIYJ
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Mine had them at one point. They fell off or something and I ended up junking them. Couldn't figure out what they were doing. My heater and recirculation work fine. It's all mechanical levers.
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Unread 05-02-2013, 07:43 PM   #13
zeus87gn
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The flapper valve it works is up behind the dash
you wont see it without at least removing the center gauge cluster
Or the glove box
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Unread 05-02-2013, 08:01 PM   #14
87TPIYJ
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So what does that flapper valve do?
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Unread 05-02-2013, 08:12 PM   #15
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http://www.jeepforum.com/forum/f12/m...77/index3.html

Supposedly it opens the driver side gate. If u ditched the black vac line don't u have a vac leak?
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