Vacuum line Question (SEE PIC)!!!

I'm hoping someone can shed some light on what a specific vacuum hose is from and to. Please see the below pics and any info you can give me on what this hose is i appreciate it.

That plastic vacuum line comes from the dash HVAC selector and goes to a valve in the heater hose line. During MaxAC it shuts down the heater water to keep the housing as cool as possible

Hmmm? I'll look for that valve on the hose. I don't remember seeing a valve on the heater hose

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They can disappear

Will the AC function properly without it hooked up? I just replaced compressor, reciever/dryer, condenser and expansion valve. Just chasing down all the issues before I have system filled with refrigerant.

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Yes. Your controls may be a bit sluggish, it is best to plug the end

I'm currently trying to find vacuum problem that would make hvac controls on blow out of dash vents. No defroster vents, etc.

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That loose line could do it

Do u think if i plug it that might correct the problem? I don't mind bringing back to stock and getting the valve back in the heater hose if it's worth it

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It might if that is the only vacuum leak

That's a good one!

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So Ive attached a pic of the Heater Valve and a vac line that comes out of it and when you follow it seems to be connected and goes back into cab with a bundle of vac lines.


Any other ideas what the pinkish vac line that is broken (pic above) might be?

Someone may have bypassed it, but I think that the pinkish line is the original line.

It's strange if u follow the line from heater valve it converts to a blue line that goes back to cab. Wierd

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I think it is obvious someone has worked on this

Any idea what that second line it terminates to is?

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What, that black one with the check valve in it?

Yes that one. It's black going into the check valve and blue coming out going into vac line bundle

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Not really. You will have to check this out by following it. I believe your front axle has a disconnect on it. Normally, one red line with a disconnect goes to the transfer case selector switch, which has two lines come out that go to the disconnect, which has one return line that comes to a vacuum switch on the same harness located just under the heater motor. That bundle of lines going into the cabin are a mystery to me. As I said, someone has worked on this

I'm not 100% the bundle goes into the cab. They all wrapped I need to follow and verify. More to follow. Thanks again for the help

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