Coolant Change Help
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Northstar Engines and System Technical Discussion Discussion, Coolant Change Help in Cadillac Engine Technical Discussion; ...
  1. #1
    midnightrider is offline Cadillac Owners Member
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    Coolant Change Help

    Hello everyone,

    Iíve done the searches and I will follow the proper procedure on replacing my coolant. This will be simply be a drain and change along with the 6 GM tablets. Not a complete flush. My question is how much coolant will I need to replace on a drain and change only (2000 Eldorado ECT)? I know how much the Northstar will hold on a complete flush but Iím not sure how much Iíll need this time. I know it can very but I want to have the mimium amout so I know how much to buy.

    Thanks!

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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Coolant Change Help

    Buy one gallon of coolant and one gallon of distilled water. Pre mix it and you'll have some leftover.

  4. #3
    midnightrider is offline Cadillac Owners Member
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    Re: Coolant Change Help

    Quote Originally Posted by Ranger View Post
    Buy one gallon of coolant and one gallon of distilled water. Pre mix it and you'll have some leftover.
    Hey Ranger, so I should not buy the 50/50 pre mixed?

  5. #4
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Coolant Change Help

    Why spend over twice as much for what you can do on a workbench in 3 minutes??

    You get a gallon of DEX-COOL and a gallon of distilled water from the supermarket (dirt cheap). Use a 2-quart pitcher and pour half the water into it. Pour half the DEX-cool into the water jug. Pour the water in the pitcher into the half-empty DEX-COOL jug. BINGO !!! 2 gallons of mixed coolant (and the pitcher is still clean).

    3 tablets, not 6.

  6. #5
    midnightrider is offline Cadillac Owners Member
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    Re: Coolant Change Help

    Quote Originally Posted by submariner409 View Post
    Why spend over twice as much for what you can do on a workbench in 3 minutes??

    You get a gallon of DEX-COOL and a gallon of distilled water from the supermarket (dirt cheap). Use a 2-quart pitcher and pour half the water into it. Pour half the DEX-cool into the water jug. Pour the water in the pitcher into the half-empty DEX-COOL jug. BINGO !!! 2 gallons of mixed coolant (and the pitcher is still clean).


    3 tablets, not 6.
    Genius!

    I thought I read to use 6 tablets to be even safer??? No?

  7. #6
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Coolant Change Help

    Personally I would not use any of those things any more. They just clog heater cores and purge lines. Even GM quit using them.

  8. #7
    midnightrider is offline Cadillac Owners Member
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    Re: Coolant Change Help

    Quote Originally Posted by Ranger View Post
    Personally I would not use any of those things any more. They just clog heater cores and purge lines. Even GM quit using them.
    So would everyone agree with Ranger and NOT use the tablets?

  9. #8
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Coolant Change Help

    If you now have no weeps or leaks, why chance clogging up a heater core or purge line ???

  10. #9
    midnightrider is offline Cadillac Owners Member
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    Re: Coolant Change Help

    Quote Originally Posted by submariner409 View Post
    If you now have no weeps or leaks, why chance clogging up a heater core or purge line ???
    Nope, no leaks so I will not be using the tablets. Thanks everyone for the advise.

  11. #10
    tateos's Avatar
    tateos is offline Cadillac Owners Connoisseur
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    Re: Coolant Change Help

    Personally, I don't think 3, or even 6, tablets ever clogged anything - but if anything, maybe it would be the small purge line orifice on the '99 and older design engines. I did notice a distinct dried, brown coating on the outside of the cylinders and surrounding water jackets on my '97 when I did my HG, which I lightly wire brushed off with a long, small diameter, brass wire brush.

  12. #11
    codewize's Avatar
    codewize is offline Cadillac Owners Master
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    Re: Coolant Change Help

    3 tablets per GM in the lower hose. I actually put mine in the upper hose because it was easier. You'll get about 6 quarts out so you'll need to put 6 quarts back.

    Don't waste the money on pre-mixed coolant. You get half the coolant for more money. Buy a gallon of DEX and a gallon of distilled water. Make a 50 / 50 mix and you'll have 2 quarts left over for topping off later.
    Ownership:
    89 STS (1 of 1893) - FOR SALE
    91 d'Elegance 350
    02 DTS
    01 DTS:
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    Custom PCM
    Body color engine components
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    EBC brakes and rotors
    Eibach springs
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    Future Plans: More interior work.


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  13. #12
    midnightrider is offline Cadillac Owners Member
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    Re: Coolant Change Help

    Quote Originally Posted by codewize View Post
    3 tablets per GM in the lower hose. I actually put mine in the upper hose because it was easier.
    Codewize, did you crush your tablets first or put them in whole?

  14. #13
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Coolant Change Help

    Crushed.

  15. #14
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Coolant Change Help

    It is actually easier to put them in uncrushed. They will dissolve pretty quick and the water pump impeller will take care of the rest. The only reason for crushing them is on the 4.1, 4.5 and 4.9 they go in the radiator and due to the oil cooler line inside the side tank there is not enough room to get more than 2 in there whole.

  16. #15
    codewize's Avatar
    codewize is offline Cadillac Owners Master
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    Re: Coolant Change Help

    I did not crush them. I put 3 whole tablets in the engine side if the upper hose.

    This was about 3 years ago. However, I recently had a very minor coolant leak. I even noticed a few drops of coolant on the splash pan while changing the oil.

    I took it into the dealer prepared to have the crossover gaskets done but they told me it wasn't leaking there. They did a leak-down test and found nothing was leaking. Odd, since I was loosing coolant and we all agreed there was a drip.

    They added 3 more tablets to the lower hose. So far so good.

    Quote Originally Posted by midnightrider View Post
    Codewize, did you crush your tablets first or put them in whole?
    Ownership:
    89 STS (1 of 1893) - FOR SALE
    91 d'Elegance 350
    02 DTS
    01 DTS:
    Custom installed Volant CAI
    Custom PCM
    Body color engine components
    Cruiser Alloy wheels
    EBC brakes and rotors
    Eibach springs
    Corsa exhaust
    Sportwing Spoiler
    Semi-custom interior
    Custom quad Hi-Beams
    Future Plans: More interior work.


    Memberships:
    National and regional Cadillac & LaSalle Club
    Proud Volunteer - Northstar Tuning Project
    Guinness World Records - Largest Cadillac Parade

    ----------------------------

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