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Thread: HVAC damper issue

  1. #1
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    HVAC damper issue

    So the last time I took my car out I tried to use my AC and the air comes out at the floor, no matter what I do with the controls. Checked for EATC codes and got none.

    Safe to assume this is a bad damper actuator? Is it the one behind the radio?
    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/
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    First retailed 2003 Marauder
    Bought 6 June 2002
    #168

  2. #2
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    May still be an EATC head unit issue.

    The default setting for a loss of vacuum supply is to go to defrost. Defrost and floor share a common actuator, so there has to be vacuum pulling it to the floor position. If you put the EATC into Vent and it does not open the vent door, then it sounds like the issue may be internal to the head unit.
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  3. #3
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    Quote Originally Posted by RF Overlord View Post
    May still be an EATC head unit issue.

    The default setting for a loss of vacuum supply is to go to defrost. Defrost and floor share a common actuator, so there has to be vacuum pulling it to the floor position. If you put the EATC into Vent and it does not open the vent door, then it sounds like the issue may be internal to the head unit.
    I assume then that there is an air switch that puts vacuum to the actuator based on a command from the controller that could also be the issue?

    I'm slow today. Just occurred to me that if the switch is bad I would have air to the defrost.
    Last edited by kirk; 08-17-2018 at 10:29 AM.
    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

  4. #4
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    “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"
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  5. #5
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    Quote Originally Posted by fastblackmerc View Post
    Looked there before I posted. My issue isn't one of the 4, but thanks for trying.
    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

  6. #6
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    I would check the vacuum to the head unit, start the car and pull the hose assy off the back of the eatc.

    That white hose might be ripped, or there is a also a quick connect that looks like the connection at the back of the eatc on the pass side under dash.

    Idk. I'm just trying to help
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  7. #7
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    The black hose is the vacuum supply. White is for fresh/recirc, blue is for the panel vents, and red and yellow are for the floor/defrost dual actuator.

    Quote Originally Posted by kirk View Post
    I assume then that there is an air switch that puts vacuum to the actuator based on a command from the controller that could also be the issue?
    The vacuum "switch" is the plastic manifold that the solenoids attach to. When the controller commands a particular solenoid to open, it provides vacuum to the appropriate actuator.
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  8. #8
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    Further investigation leads me to believe it is the solenoid O-rings. While air is coming out on the floor, it is also coming out the defrost. I was also getting heat today that I wasn't feeling the other day. Age and symptoms indicate it's worth changing the O-rings. Probably won't happen for a month or two.

    Thanks for all the input.
    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

  9. #9
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    Remember to use silicone o-rings, size -007. Also check the manifold for cracks or porosity. JB Weld is your friend if you find any.
    The Blackbird
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    2004 Grand Marquis LS Limited Edition
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  10. #10
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    Quote Originally Posted by RF Overlord View Post
    Remember to use silicone o-rings, size -007. Also check the manifold for cracks or porosity. JB Weld is your friend if you find any.
    Big help there. Thanks
    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

  11. #11
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    I can repair your EATC and replace the bulbs with LEDs.
    “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




  12. #12
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    Quote Originally Posted by fastblackmerc View Post
    I can repair your EATC and replace the bulbs with LEDs.
    Thanks, I'll ponder that.
    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

  13. #13
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    How did it go? Did you get it fixed?

  14. #14
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    I had a very similar problem. The blend door is made of plastic with a plastic hinge. The hinge broke from normal use. Took me an entire day to fix, with hardware store bought hinges and ingenuity

  15. #15
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    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?
    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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