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Cadillac Seville / Cadillac Eldorado Forum Discussion, Post new radiator install, temp issues in Past Cadillac Vehicle Discussion; Got it booked in, to have a coolant system flush, explained the issue and history, they said they hook it ...
  1. #46
    curlywurly is offline Cadillac Owners Fanatic
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    Re: Post new radiator install, temp issues

    Got it booked in, to have a coolant system flush, explained the issue and history, they said they hook it up to a machine specially made to do this.

    Just noticed, the pressure cap says 15 psi, the one I have coming says 18 psi (ACDelco RC87), 15 psi ones do not seemed to be readily available, I'll leave the old on for now.

  2. #47
    basscatt's Avatar
    basscatt is offline Cadillac Owners Master
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    Re: Post new radiator install, temp issues

    Quote Originally Posted by curlywurly View Post
    Got it booked in, to have a coolant system flush, explained the issue and history, they said they hook it up to a machine specially made to do this.

    Just noticed, the pressure cap says 15 psi, the one I have coming says 18 psi (ACDelco RC87), 15 psi ones do not seemed to be readily available, I'll leave the old on for now.
    ------------------
    it looks like RC98 is the delco part number for the 15PSI cap -

    but your car should have the RC87 - 18PSI cap -

  3. #48
    curlywurly is offline Cadillac Owners Fanatic
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    Re: Post new radiator install, temp issues

    Definitely says 15 on the current cap on the car, I've never changed the cap, and the previous owner (friend of the family, maintains most of vehicles himself), says he has never changed it, so a mystery. Up to the point I changed the rad out, the 15 psi cap seems to have worked fine, as did the cooling system, even in OK 100F summers the temp gauge hardly ever went pass the 12 mark.

    Also, the RC87 cap looks identical to the current one, the RC98 looks different, not that looks mean much, just saying...

  4. #49
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Post new radiator install, temp issues

    Quote Originally Posted by curlywurly View Post
    If I take it to a shop (most likely) is a power flush different from a regular flush?
    Yes it is. A flush is simply running fresh water through the system. A power flush does it with a flush gun under pressure. Based on everything you said, I think I would lean towards a power flush, but that's just me.


  5. #50
    curlywurly is offline Cadillac Owners Fanatic
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    Okay, new pressure cap fitted and things are much better now, the old cap must have been faulty, so far so good.

  6. #51
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: Post new radiator install, temp issues

    Good to know. Thanks.

  7. #52
    Tankboy40's Avatar
    Tankboy40 is offline Cadillac Owners Fanatic
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    Re: Post new radiator install, temp issues

    Quote Originally Posted by basscatt View Post
    ------------------------
    you want it flushed - not just a regular drain and fill -
    I am a former shop manager and let me give you one piece of advice.

    WATCH them hook the machine up and do the flush.

    It does not matter if you know what they are doing or not, just be sure they hook the machine up.

    I have had mechanics working for me in the past who did a drain and flush (against my orders) because they thought they could get away with it due to the fact that they were lazy and didnt want to hook the machine up.

    Just my $.02

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