What goes in this rectangular hole?
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Cadillac Seville / Cadillac Eldorado Forum Discussion, What goes in this rectangular hole? in Past Cadillac Vehicle Discussion; Hi Everyone, I'm new to the Caddy forums. I just picked up a 02 Eldorado ETC from a dealer who ...
  1. #1
    txtaz is offline Cadillac Owners Fanatic
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    What goes in this rectangular hole?

    Hi Everyone,
    I'm new to the Caddy forums.
    I just picked up a 02 Eldorado ETC from a dealer who was going to wholesale it because of mechanical problems. I made an offer, they countered and I have a new project to work on.
    This is my third Eldorado. My Grandfather gave me my first two. Both restored, well almost. Still working on the 92 a bit but almost completed.
    So far with the 02, I've re-built the front brakes, torsion bar links, fixed a shorted #4 injector wire and a loose intake manifold. It is running pretty good for what was planned as a rebuild. I honestly thought I'd be putting in a remanned based on what their mechanic told me. Now it's running great. Still a little rough on idle, but I'll get there.
    My question is...
    Who knows what goes in this rectangular hole on the firewall? (Circled in Red) I have it taped up so the air does not blow out.
    HoleAtFirewall.jpg
    The moisure barrier is shot and needs a new one. The dealer can get it for $177. Any better options for this part?
    Does the moisture barrier have a fitting that covers this hole in the 02 ETC or is there a module I'm missing? There are two screw holes for something to go in the hole.
    I have the GM service manuals coming, yup the ol' school ones...on paper.
    Thanks for the help.
    Taz

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    98Geldog is offline Cadillac Owners Fanatic
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    Think that's just a cut out to see the evaporator. With a new one the hole won't be there

  4. #3
    basscatt's Avatar
    basscatt is offline Cadillac Owners Master
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    Re: What goes in this rectangular hole?

    actually -
    that's where the blower motor resistor USED to be located -
    when the Eldo had one - the blower speed controls are built into the blower on this year -

    yes - there should be a cover plate over that hole -

  5. #4
    N*Caddy's Avatar
    N*Caddy is offline Cadillac Owners Master
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    Re: What goes in this rectangular hole?

    That is normally not cut from factory, is one piece with the firewall plastic cover and there is a note on it: CUT TO SERVICE.

  6. #5
    txtaz is offline Cadillac Owners Fanatic
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    Re: What goes in this rectangular hole?

    Nice, Thank you.
    Sounds like the new moisture barrier will cover this hole.
    Is it normal for the moisture barrier to fail after 10 years and 55,000 miles?
    I was shocked at how brittle it is. It's obviously from the right bank(even) exhaust header heat over time.
    Maybe wrapping the header would help the new one last longer.
    Any thoughts?

    Thanks,
    Taz

  7. #6
    Ranger's Avatar
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    Re: What goes in this rectangular hole?

    If by "moisture barrier" you mean, what I call the HVAC housing (#8), yes, it is common for them to get brittle over time. I'm surprised that the dealer can get it. I had heard that they where no longer available and can't even find a part number for them at gmpartsgiant or Nalleygmc. I assume you know that the engine has to be removed in order to replace it?


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    txtaz is offline Cadillac Owners Fanatic
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    Re: What goes in this rectangular hole?

    Hi Ranger,
    Thanks for the info.
    Moisture barrier was the term the dealer parts guy used and said he could get one. I've searched out part numbers also and did not find anything.
    Yes, #8 in the diagram, however I think mine only covers the passenger side.
    My plan is to get the part and decide to pull the motor or not.
    I might have a good diy write up for this, let's see if I get the part first.
    Taz

  9. #8
    brougham is offline Cadillac Owners Master
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    Re: What goes in this rectangular hole?

    Is that still the same black cover as the 90s Devilles and STS, Eldorado had that always breaks up and falls apart? I had the chance to get a perfect one for mine but it was too much work to be bothered changing. I finally patched it up last fall.

    I think mine has a removable door covering that hole.

  10. #9
    Ranger's Avatar
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    Re: What goes in this rectangular hole?

    Yup, that's the one.

  11. #10
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    Re: What goes in this rectangular hole?

    Looks like an easy fix with some resin and fiberglass followed by some flat black paint.

  12. #11
    RippyPartsDept's Avatar
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    Re: What goes in this rectangular hole?

    basscat is correct

    the original N* HVAC system had a blower motor control module that plugged into that spot but the second design HVAC system used a blower motor with the controls built into it

    they decided to keep the same housing cover part to service both old and new and the new ones would just need the cover

    the cover is GM#52472473

    around 1997 model year they changed the housing cover to not have a hole in it
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  13. #12
    txtaz is offline Cadillac Owners Fanatic
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    Re: What goes in this rectangular hole?

    Thanks everyone.
    I just got the new cover, it came in over night by the dealer. Wow!
    It is part #89019293 for $160.78.
    It looks like it will go in without pulling the motor. I'll take pics when I get to it.

    Ordering part GM#52472473 first.
    Thanks.
    taz

  14. #13
    Ranger's Avatar
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    Re: What goes in this rectangular hole?

    Quote Originally Posted by RippyPartsDept View Post
    the original N* HVAC system had a blower motor control module that plugged into that spot but the second design HVAC system used a blower motor with the controls built into it
    When did that change come about Chris? What about the pre-Northstar Devilles? Which one did those use? I can't recall.

  15. #14
    RippyPartsDept's Avatar
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    If have to check. I think it was closed up on 1997 models. I know K-body 4.9L models did have that same style box as their N* siblings but before '93/'94 I'd have to check.
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  16. #15
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    Re: What goes in this rectangular hole?

    OK. I asked because I distinctly remembered that resistor module (even changed one) on the mid '80's Eldo's, but can't recall if my '92 Deville had it or not.

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