Vacuum line Question (SEE PIC)!!!

[chrs93]

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.

[4.3LXJ]

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

[chrs93]

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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[4.3LXJ]

They can disappear

[chrs93]

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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[4.3LXJ]

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

[chrs93]

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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[4.3LXJ]

That loose line could do it

[chrs93]

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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[4.3LXJ]

It might if that is the only vacuum leak

[chrs93]

That's a good one!

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[chrs93]

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?

[4.3LXJ]

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

[chrs93]

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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[4.3LXJ]

I think it is obvious someone has worked on this

[chrs93]

Any idea what that second line it terminates to is?

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[4.3LXJ]

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

[chrs93]

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

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[4.3LXJ]

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

[chrs93]

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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