HomeForumsTechnical – GeneralDrivelineVS HVAC Vacuum Lines

This topic contains 5 replies, has 3 voices, and was last updated by Profile photo of exec24 exec24 8 years, 8 months ago.

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  • #14105
    Profile photo of exec24
    exec24
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    Member since: April 8, 2015
    Posts: 435
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    does anyone know what the 2 Vacuum line’s coming out the firewall on my VS, near the Heater hoses need to go to? and what direction they run? and also how the Vacuum tank is plumbed in?

    i know there Vacuum for the heater vents and heather tap, but the last time i had them on my old engine they never worked correctly, so must of been setup wrong

    • This topic was modified 8 years, 8 months ago by Profile photo of exec24 exec24.
    #14112
    Profile photo of HDN05L
    HDN05L
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    Member since: March 2, 2015
    Posts: 289
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    From memory and i could be wrong but one line is for the vents and ac controls that runs into the tree on the back of the manifold. It sits under the brake booster vacuum hose.

    The other line should join the one way valve that runs to the inlet manifold looks black and white.

    #14137
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    VS 355 UTE
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    Member since: January 13, 2016
    Posts: 141

    As far as i know there is only one vacuum line that enters next to the heater hoses into the cabin.This activates the heater controls etc.Vacuum tank is connected to inlet manifold, cabin line goes from the vacuum ball up behind dizzy where it has a T piece .One line goes to heater tap and the other enters the cabin.This allows the cabin controls for heater to be activated after engine is turned off.

    Be careful to check the vacuum on/off valve is adjusted/working correctly.If it’s not ,the heater tap won’t activate. If not set up right it won’t compress the plunger far enough to let the vacuum through.It’s located in the driver’s side foot well area.A black plastic torpedo shaped thing  that is switched on and off by a white plastic arm off the heater controls.Mine was 3/4 in but still wash’t working.Needs to compress all the way.Finally check that your heater tap is not corroded and stuck open like mine was, and i always used coolant.These cars are getting old after all.

    Anyway hope this helps.

    #14138
    Profile photo of exec24
    exec24
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    had a look a a heap of vs’s today at the wreckers, most VS’s and VR’s has 2, i recon some were just missing them, i’ll draw up a diagram in a minute for future reference

    and my VS has climate control and a brand new heater tap (whole car is practically new now)

    #14141
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    VS 355 UTE
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    Member since: January 13, 2016
    Posts: 141

    No worries mate,just some experience with my car.

    Was difficult to see around that area with the heater pipes,lots of wires ,catch can lines etc ,could only see one vacuum line.

    Cheers.

     

    #14143
    Profile photo of exec24
    exec24
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    Member since: April 8, 2015
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    all good mate, hopefully when i put it in last time i just put something in wrong, don’t really want to pull the dash out again

    this is how i found most of them to be plumbed up

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