Changing Coolant and the Right Number of Tablets - Page 4
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Northstar Engines and System Technical Discussion Discussion, Changing Coolant and the Right Number of Tablets in Cadillac Engine Discussion; Okay, after reading all these posts, I'm STILL confused as to what the proper procedure is for my newly acquired ...
  1. #46
    08flstc is offline Cadillac Owners Member
    Automobile(s): 1987 CoupeDeVille
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    Re: Changing Coolant and the Right Number of Tablets

    Okay, after reading all these posts, I'm STILL confused as to what the proper procedure is for my newly acquired 1987 DeVille? The car currently has "green" coolant in the system. Since I do no know the service history and the car has 88,000 miles on it, I want to make SURE that the coolant system is up to par, so the following questions come to mind...

    1) Should I drain, flush and re-fill the system with a 50-50 mix of Dex-cool?
    2) Should I add 3 or 6 of the GM tablets to the system?

    The car runs great now and I want to do everything I can to keep it that way. Thanks in advance for your help.

    Chris in PA
    1987 Sedan DeVille


  2. #47
    Submariner409's Avatar
    Submariner409 is offline If it won't run, install a boombox
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    Re: Changing Coolant and the Right Number of Tablets

    A 1987 engine is far removed from the general Northstar coolant/tablets/powder discussions.

    Simply exchange your old coolant for a fresh fill of good ol' green 50/50 coolant and forget the tablet thing - if the cooling system has no leaks now, why risk clogging a heater core ?

  3. #48
    tateos's Avatar
    tateos is offline Cadillac Owners Connoisseur
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    Re: Changing Coolant and the Right Number of Tablets

    Well, if you've already got conventional green coolant, whether it's an '87 or a '97, I would say drain and re-fill with green coolant and 3 tablets - they can do no harm, unless you add too many - then they can become too much of a good thing

  4. #49
    00 Deville's Avatar
    00 Deville is offline Cadillac Owners Connoisseur
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    Re: Changing Coolant and the Right Number of Tablets

    Quote Originally Posted by tateos View Post
    Well, if you've already got conventional green coolant, whether it's an '87 or a '97, I would say drain and re-fill with green coolant and 3 tablets - they can do no harm, unless you add too many - then they can become too much of a good thing
    I agree with you that the 08flstc should stay with the green coolant in his '87. I'm going to have to disagree with the use of the tablets... I wouldn't put the tablets in my car unless I was experiencing a leak that could not be easily fixed or diagnosed. I recently performed an autopsy on the surge tank on my 02 Deville and was amazed at the amount of sludge in the bottom of the tank. I highly suspect the sludge was from the seal tabs. The pictures can be seen in the thread below.

    http://www.cadillacforums.com/forums...issection.html

  5. #50
    barrych's Avatar
    barrych is offline Cadillac Owners Member
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    Re: Changing Coolant and the Right Number of Tablets

    2003 deville here do i need these tablets when changing the coolant ?

  6. #51
    Submariner409's Avatar
    Submariner409 is offline If it won't run, install a boombox
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    Re: Changing Coolant and the Right Number of Tablets

    This thread is very old. Since its post date GM has issued a TSB (Technical Service Bulletin, 2004) that discontinues the use of the tablets or powder. No updates were or will be issued for hard copy service manuals or the radiator cover sticker.

    Read Post 39.

    If your cooling system is in good condition with no nuisance weeps, don't use the stuff - it tends (with constant use) to clog various cooling system passages and parts.

    The tablets are Bar's Leaks #HDC, the equivalent powder is Bar's Leaks #G12BP. Crumbled and placed in the lower radiator hose, not in the surge tank !!!


    FWIW, There is a LOT of very misleading information in the first 15 or 20 posts in this thread. Tread carefully.

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