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Thread: EATC o-ring repair - How to... with pics.

  1. #91
    Join Date
    Aug 2004
    Location
    Chi Town
    Posts
    251
    Thanks to all the guys who shared their knowledge about the EATC O-ring fix. You're postings of How-To's, pics and part n's really saved me a lot of cash and maybe my marriage too. A shop quoted me over $500 to replace the EATC. And the wife hasn't been happy since the AC stopped coming out of the vents. So its a win win all around. I was able to drive over to McMaster Carr since its local to me, get the O-rings and swap out in just a couple hours. Worked like a charm. Thanks again! Peace...
    2004 Marauder

    SVT Contour 3L

  2. #92
    Join Date
    Dec 2004
    Location
    Canada
    Posts
    772
    Mine only comes out through the dash vents. No defrost or floor. A/C and heat work fine but only through vents. Anyone else ever have this? O rings ?

  3. #93
    Join Date
    Jul 2014
    Location
    NY
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    1,391
    Quote Originally Posted by Canadasvt View Post
    Mine only comes out through the dash vents. No defrost or floor. A/C and heat work fine but only through vents. Anyone else ever have this? O rings ?
    Contact fastblackmerc. He can help you:

    https://www.mercurymarauder.net/foru...ad.php?t=99619

  4. #94
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    Dec 2004
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    ***_***_****
    Last edited by Canadasvt; 12-05-2017 at 10:54 AM.

  5. #95
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    Quote Originally Posted by Canadasvt View Post
    Thank you Ambitious for the direction.
    Thank you to fastblackmerc for ALL the help.
    You'll also want to put a small amount of silicone dielectric grease on the o-rings before you install the plunger. Will help in the long run.
    “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. #96
    Join Date
    Mar 2016
    Location
    Asheville, NC
    Age
    36
    Posts
    22
    I hope this is the right place for this. Sorry if this was already covered somewhere.

    I replaced EATC o-rings, and now I have new symptoms.

    BEFORE o-ring replacement, I had no fan speed control and no vent selection control (hi-speed defrost only). But I was able to control the temperature.

    AFTER o-ring replacement, I fully regained vent selection control. But TWO things happened.
    1. The fan speed is touchy. I have some control (a lot more than before o-rings), but it still seems a bit erratic.
    2. I immediately lost control of temperature control. After plugging the unit back in and testing the vent selection, I tried to change the temp and I immediately heard the blend door motor clicking, then it stopped and all temp control was lost. I reset the code and it happened again. Freon and compressor are good.

    So the obvious question: what's going on here? The timing of the o-ring replacement and the new symptoms seems suspect. Why would fixing the vacuum issue within the EATC cause new problems in the blend door motor and potentially the blower motor?

  7. #97
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    Quote Originally Posted by 04allstock View Post
    I hope this is the right place for this. Sorry if this was already covered somewhere.

    I replaced EATC o-rings, and now I have new symptoms.

    BEFORE o-ring replacement, I had no fan speed control and no vent selection control (hi-speed defrost only). But I was able to control the temperature.

    AFTER o-ring replacement, I fully regained vent selection control. But TWO things happened.
    1. The fan speed is touchy. I have some control (a lot more than before o-rings), but it still seems a bit erratic.
    2. I immediately lost control of temperature control. After plugging the unit back in and testing the vent selection, I tried to change the temp and I immediately heard the blend door motor clicking, then it stopped and all temp control was lost. I reset the code and it happened again. Freon and compressor are good.

    So the obvious question: what's going on here? The timing of the o-ring replacement and the new symptoms seems suspect. Why would fixing the vacuum issue within the EATC cause new problems in the blend door motor and potentially the blower motor?
    Are the internal connectors (plugs) on the pins in the right orientation?

    Are the two electrical connectors on the back of the EATC inserted fully?

    Did you kink or disconnect the vacuum hoses?

    Did you complete disassemble the solenoids to do the repair and reassembled them wrong?

    Did you check the vacuum manifold for leaks?

    Did you run the EATC self-test?
    Last edited by fastblackmerc; 12-05-2017 at 09:15 AM.
    “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




  8. #98
    Join Date
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    Northern California
    Posts
    2,373
    Original pictures not available.

  9. #99
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    Jan 2004
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    Quote Originally Posted by Lowndex View Post
    Original pictures not available.
    Pictures!

    We don't need no stinkin' pictures!
    “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




  10. #100
    Join Date
    Mar 2016
    Location
    Asheville, NC
    Age
    36
    Posts
    22
    Quote Originally Posted by fastblackmerc View Post
    Are the internal connectors (plugs) on the pins in the right orientation?

    Are the two electrical connectors on the back of the EATC inserted fully?

    Did you kink or disconnect the vacuum hoses?

    Did you complete disassemble the solenoids to do the repair and reassembled them wrong?

    Did you check the vacuum manifold for leaks?

    Did you run the EATC self-test?
    yes
    yes
    no
    maybe
    no
    yes

    When the vacuum hoses are disconnected from the back of the unit, I was getting suction only on the black hose. I assume that's normal?

  11. #101
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    Quote Originally Posted by 04allstock View Post
    yes
    yes
    no
    maybe
    no
    yes

    When the vacuum hoses are disconnected from the back of the unit, I was getting suction only on the black hose. I assume that's normal?
    Vacuum on the black (source) hose only.

    Maybe? - Did you take out the spring and the plunger?
    “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. #102
    Join Date
    Mar 2016
    Location
    Asheville, NC
    Age
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    22
    Quote Originally Posted by fastblackmerc View Post
    Vacuum on the black (source) hose only.

    Maybe? - Did you take out the spring and the plunger?
    Yes, I removed the spring and plunger on all four, and replaced the o-ring with a red silicone o-ring with dielectric grease. Maybe was in reference to if I put it all back together correctly, though I'm pretty sure I did.

  13. #103
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    Quote Originally Posted by 04allstock View Post
    Yes, I removed the spring and plunger on all four, and replaced the o-ring with a red silicone o-ring with dielectric grease. Maybe was in reference to if I put it all back together correctly, though I'm pretty sure I did.
    Very easy to put the plunger in upside down.
    “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




  14. #104
    Join Date
    Mar 2016
    Location
    Asheville, NC
    Age
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    22
    Quote Originally Posted by fastblackmerc View Post
    Very easy to put the plunger in upside down.
    Good to know. Would an upside down plunger cause blend door issues like the one I described? What is the best way to know the plungers and everything are in correctly? Is there a diagram somewhere?

  15. #105
    Join Date
    Sep 2002
    Location
    Cape Cod, MA
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    13,676
    The blend door is electrically-operated and should not be affected by anything vacuum-related. If it was working properly before you opened the unit, I'd say you have a wiring/connector issue.
    The Blackbird
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