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Thread: HVAC damper issue

  1. #16
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    Quote Originally Posted by kirk View Post
    So I finally got to this today and I already have to stop and ask a question.

    The instructions state "But first, make sure they hold vacuum when not energized. Connect a hose to the center vacuum port (where the black tube was connected) and suck it. It should hold vacuum. If it doesn't, the following fix probably isn't for you."

    I have my EATC out and I did a vacuum check on the center port and it leaks.

    I thought the whole issue here is that the O rings leak and it won't hold vacuum. Is there some other seat or seal in the solenoid that should hold this or are the instructions backwards?
    The EATC o-rings need to be replaced.
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  2. #17
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    Quote Originally Posted by fastblackmerc View Post
    The EATC o-rings need to be replaced.
    Thanks. That's what I thought and I'm moving in that direction. I was just thrown off by that sentence.
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  3. #18
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    Lightbulb Mityvac

    Quote Originally Posted by kirk View Post
    So I finally got to this today and I already have to stop and ask a question.

    Hoping everyone is using a Mityvac or something similar. On my 2nd; haven't used it in years. Wore out my first one diagnosing electro-thermo-vacuum devices from yesteryear.


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  4. #19
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    Sounds like the instructions are poorly written. The black tube (vacuum source) goes to a manifold that all the solenoids connect to. If you can hold a vacuum on the black tube, then you do not have a solenoid o-ring leak.
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  5. #20
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    Sooner or later ALL EATC solenoids WILL leak.

    BTW... Of all the EATC's I've repaired I had only 1 that the manifold was cracked.
    “When you can’t make them see the light, make them feel the heat.”
    Ronald Regan

    "The only way to deal with the Islamic State - these blood thirsty, blood-drunken, terrorists -
    is to kill them, keep on killing them, until you kill the last one, then you kill his pet goat."

    Lt. Colonel Ralph Peters

    “Be polite, be professional, but have a plan to kill everybody you meet.”
    "I come in peace. I didn't bring artillery. But I'm pleading with you, with tears in my eyes, if you **** with me, I'll kill you all"
    General James Mattis




  6. #21
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    Highly recommend FBM work. Just did mine a few weeks ago, O rings and led lights for just 45 bucks and shipping. It looks great, I didn't even know the blower speed adjuster was supposed to light up.

  7. #22
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    Well I got them changed with silicone 007 O-rings.....

    and it still leaks, though not nearly as bad as it did. No signs of cracks.

    The good news is the guy at the supply house said it wasn't worth the paperwork for 4 O-rings and gave them to me for free.

    Back to the drawing board.
    1963 Marauder S-55, Super Marauder 406
    Only factory 406 powered Marauder, and earliest built Marauder documented to still exist.
    https://sites.google.com/a/wmich.edu/supermarauder/
    ______________________________ _____________

    First retailed 2003 Marauder
    Bought 6 June 2002
    #168

  8. #23
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    Send to FBM......problem SOLVED!!
    No Marauder

  9. #24
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    Now that I've looked at this in more detail I understand these instructions. I also find them a little misleading and technically incorrect.

    Quote Originally Posted by kirk View Post
    So I finally got to this today and I already have to stop and ask a question.

    The instructions state "But first, make sure they hold vacuum when not energized. Connect a hose to the center vacuum port (where the black tube was connected) and suck it. It should hold vacuum. If it doesn't, the following fix probably isn't for you."

    I have my EATC out and I did a vacuum check on the center port and it leaks.

    I thought the whole issue here is that the O rings leak and it won't hold vacuum. Is there some other seat or seal in the solenoid that should hold this or are the instructions backwards?
    The O-rings do not seal the vacuum under no-load situations. They're only required when the solenoid is energized. And I'm sure they were the cause of the problem.

    It's the seal on the solenoid plunger that seals while de-energized. I'm not too worried about that leak because it's leaking to the vent, and the plunger will be harder to find than an O-ring.

    So it goes back together.
    1963 Marauder S-55, Super Marauder 406
    Only factory 406 powered Marauder, and earliest built Marauder documented to still exist.
    https://sites.google.com/a/wmich.edu/supermarauder/
    ______________________________ _____________

    First retailed 2003 Marauder
    Bought 6 June 2002
    #168

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