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post #1 of 12 Old 10-18-2007, 01:17 PM Thread Starter
EJames1226
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What is this part?

What is this part called that i highlighted? What does it do? Where does it go? Do i need it? Is it expensive?

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post #2 of 12 Old 10-18-2007, 01:24 PM
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umm my guess is heater control vac or something like it...i would keep it if its broke you can get a new one i think the people at HELP have them and usually available at most parts stores

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post #3 of 12 Old 10-18-2007, 01:36 PM Thread Starter
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Quote:
Originally Posted by bobbert350
umm my guess is heater control vac or something like it...i would keep it if its broke you can get a new one i think the people at HELP have them and usually available at most parts stores
Heater Control Vac? As in the heater that i can control inside the jeep? My heater still works i think.

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post #4 of 12 Old 10-18-2007, 01:41 PM
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prety sure that is a vacume check valve.
shoud be fairly cheap too.
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post #5 of 12 Old 10-18-2007, 05:42 PM
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I think that line runs down to your front axle disconnect...

A small fire took mine out... replaced it so that I could get 4WD again...

So do you need it? Only you can answer that question. Got Posi Lock? Then no...

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post #6 of 12 Old 10-18-2007, 05:55 PM
will_982
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It is the vaccum control valve for the auto hubs, all those lines go back to the transfer case. I think the other line right next to that just ends a couple inches lower than that valve.
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post #7 of 12 Old 10-18-2007, 06:18 PM
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what's this

while we're playing "what is it", right below the part you highlighted, in the lower center of the picture is what appears to be a small rubber hose sticking straight up with what looks like a wooden dowel stuck in the end of it. Does anyone know what that is and what function it serves. I've wondered about that for a long time..

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post #8 of 12 Old 10-18-2007, 06:24 PM
will_982
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air valve for the transmission, there is one up front next to the rad for the front axle
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post #9 of 12 Old 10-18-2007, 06:40 PM
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Also known as a breather...

-Scott

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post #10 of 12 Old 10-19-2007, 12:52 AM Thread Starter
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For the record, one of the tubes from this vacume thing runs to the fuel area, like on the intake manifold.

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post #11 of 12 Old 10-19-2007, 05:13 AM
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It's probably a vac line from the Tcase then, if it has another line coming off of it near the intake going into the firewall, then that's what it is (that part that comes off would be going to the indicator light).

OH WAIT. WHAT?
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post #12 of 12 Old 10-19-2007, 10:24 AM
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Quote:
Originally Posted by Switch1625
For the record, one of the tubes from this vacume thing runs to the fuel area, like on the intake manifold.
Ok, if you haven't figured it out yet, here's how it works.

In your picture you have circled the main vacuum check valve on the tube harness for the front axle disconnect. It serves the purpose of keeping the vacum in the engine when you don't have the TC engaged. The hose that runs back over to the intake manifold gives it the needed vacuum to operate the disconnect as the manifold is always in vacuum when the engine is running.

Get it?

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