1970 472 Freeze Plug?
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500, 472, 425, 368 Discussion, 1970 472 Freeze Plug? in Cadillac Engine Technical Discussion; Hi Gang, I took my 70 Coupe Deville out tonight and got about a mile from home and my car ...
  1. #1
    Cristofo's Avatar
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    1970 472 Freeze Plug?

    Hi Gang,

    I took my 70 Coupe Deville out tonight and got about a mile from home and my car was overheating with smoke coming out of the engine towards the firewall.

    I finally located exactly where the leak is coming from. If you look through the driver side front fender towards the back of the engine block, I believe I see a freeze plug there with a hole in it. I know the leak is coming from this hole but I couldn't see well enough to confirm.

    Does anyone know if this is the expansion/freeze plug and how hard it would be to replace it? Ive been searching to find a picture of the engine block but haven't had much luck.

    Thanks,
    Chris

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    Cristofo's Avatar
    Cristofo is offline Cadillac Owners Fanatic
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    Re: 1970 472 Freeze Plug?

    I grabbed a brass plug that's specific to this engine and a rubber expansion size 1 3/4" Hopefully I can get to the plug without any major removal.

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    Cristofo's Avatar
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    Re: 1970 472 Freeze Plug?

    Finally got the new rubber expansion plug in there...I had to use the 1 5/8" - 1 3/4" size. I could not get the lip of the old freeze plug out of the block, so not sure how long this fix will last. The rear most plug on the driver side was the one that was rusted and a pain in the butt to access. I drove it for about an hour after I replaced the plug with no leaking so I think it should be good for now.

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    the APEMAN is offline Cadillac Owners Fanatic
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    Re: 1970 472 Freeze Plug?

    I tried rubber plugs in the past with poor results. Maybe use a much lower pressure radiator cap. Good luck!

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    chrisntam is offline Cadillac Owners Fanatic
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    Re: 1970 472 Freeze Plug?

    Good to hear you got it fixed! Being that it's a rubber plug and you couldn't get the old one completely out, I'd watch it closely for leakage and you may want to get a more permanent fix as time allows. I just don't know how long those rubber expandables are supposed to last. Was there any documentation provided with the plug from the manufacturer that speaks to that? If not, I'd call their customer service/tech support and find out what they recommend.

  7. #6
    Cristofo's Avatar
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    Re: 1970 472 Freeze Plug?

    Thanks! I took it to my mechanic and he inspected and adjusted the expansion plug for me after I was done. Hasn't leaked and he seems to think its ok as is, so I'll leave it alone for now. I never take the car far but I do watch it like a hawk while driving to make sure nothing is screwed up.

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