Defroster vent install

Discussion in '1970 - 1973 Specific' started by gpm6367, Sep 6, 2019.

  1. gpm6367

    gpm6367 Veteran Member Gold Member

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    Bubba chopped up my defroster vent so as to hook up a flex hose for the VA system. Ok no problem I’ll just get another duct, right?

    This duct is held on by some type of screw visible through the windshield. (nice design) I don’t see how I can loosen these screws with the windshield in place. Anybody done it?

    And I’m sure that hardware store screw ain’t right. Can someone post photos of an original so I can see what type of screw used in 1970?
     

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  2. Ricks72Z28

    Ricks72Z28 Veteran Member Lifetime Gold Member

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    They were pinned and not screwed....
     
  3. jbloake

    jbloake Veteran Member

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    E953A083-5075-406F-A1B7-E67F499E4748.jpeg 1970 Looks like a plastic push in type retainer

    Edit I just read xten’s post #9 and found it funny GM went from plastic to metal. So got the magnet out and sure enough they are metal ! Thanks xten !
     
    Last edited: Sep 7, 2019
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  4. gpm6367

    gpm6367 Veteran Member Gold Member

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    I suppose it’s possible to install a plastic push in pin with windshield in place. Don’t know how I’ll get that screw out.
     
  5. Rdobbs1977

    Rdobbs1977 Huge Guns N Roses Fan

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    been there, sort of. when i got my 2nd Gen 5 years ago, it did not have defrost vent or heater. At the time i wanted to put one in and did (since taken it back out). Well, to my amazement, there were two small bolts with nuts in those defrost holes you mentioned. even with half my dash out, i could not get up in there to them best i recall. What i do recall is i had a very, very small saw. Sawed it at the top where window and dash meet. I feel ya pain,
     
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  6. 72'z'steve

    72'z'steve Veteran Member

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    The duct will stay in place with out the pins,you will just see the open holes which believe it or not many are broken off or missing[I look for stupid stuff like that] way back in the 80's I did a factory a/c to regular heat conversion due to it being so hacked up.I was lucky as you could buy a whole parts car cheap then [which I did] never could get a plastic pin in-tried extended needlenose but duct stayed in with lower screw.I remember finding the push pin-1/8 I think at the hardware store in little drawers back then-hope this helps Steve!!
     
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  7. gpm6367

    gpm6367 Veteran Member Gold Member

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    Found a near perfect one on epay. Ends are not broken and pins in place. 95B362E1-1714-4622-BE56-7A899E58A8D9.png DA90D44C-6D2B-4061-96A5-13D77B3431DF.png 18B50A0D-C00E-4912-B17B-F25D619E9BED.png 643A65BA-24E7-456E-A7A7-9AD67C627FEE.png Looking at that pin with the retention washer on bottom suggests it sits in place and you pop that washer on from underneath? I can’t see doing that given the space limitations.

    Or does that pin with the retention washer remain as is and just sit in a hole in sub dash?

    Does AIM show it? Yes, I have ordered my own AIM . : )
     
  8. jbloake

    jbloake Veteran Member

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    EAA4E442-CC56-467F-BBFE-F20C73B35D0C.jpeg I believe you just pop the upper pins in holes and install lower bolt with washer. If you look close under the dust there is a clip nut to hold the bolt
     
    Last edited: Sep 7, 2019
  9. xten

    xten Veteran Member

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    In my 73 (and I talked to another 73 owner) The push pins were metal, like rivets, which would explain why so many of those ducts are broken. I had my windshield out and couldn't remove them. The head is convex and with the location couldn't drill it out. Put fork tool between vent and metal dash,and busted the vent at both rivets. If I were putting one back in, I would use plastic push pins. Just make sure they're a tight fit so they don't come loose over time.
     
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  10. Budz

    Budz Veteran Member Lifetime Gold Member

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    As far as I know mine ('70 Z/28) are original. I put a small magnet up to them and they are metal. The dash 'pad' is reproduction, so I don't know if the indentation you see is supposed to be there

    No flash
    1 No flash.PNG
    Flash
    2 With flash.PNG
     
    Last edited: Sep 7, 2019
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