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Thread: Question about Dexcool for the Northstar 4.6

  1. #1
    rndthm is offline Cadillac Owners Member
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    Question about Dexcool for the Northstar 4.6

    I have a 2002 dts 4.6 northstar and I am going to be scheduling to have the dexcool changed in the next week or two. Before I do i need to know the best prefered method? I have called about 5 to 6 cadillac dealerships on how they mix the dexcool and have gotten 3 different responces. some of them said they mix it with tapp water (which I believe should be the wrong way), a couple more said they mix with distilled water and a few more said they get a premix already mixed from gm.... which way would be the prefered method here???


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  3. #2
    zonie77 is offline Cadillac Owners Connoisseur
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    Re: Question about Dexcool for the Northstar 4.6

    Tap water is never recommended. The 50/50 or distilled water are fine.

    If you are interested it is a fairly easy job to do yourself.

  4. #3
    AJxtcman's Avatar
    AJxtcman is offline Cadillac Owners Connoisseur
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    Re: Question about Dexcool for the Northstar 4.6

    Have your ever seen a source for large amount of distilled water a dealership?

  5. #4
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Question about Dexcool for the Northstar 4.6

    AJ....Sure: the corner supermarket, for .89 a gallon, and the dealership charges you $3.89 a gallon. The local Ford parts runner buys the stuff by the case at our local Acme. "You can s**t the fans, but you can't s**t the players" (Dexter Manley, Washington Redskins)
    rndthm, DIY with help from your factory service manual. A simple job, and you'll learn a lot.

  6. #5
    AJxtcman's Avatar
    AJxtcman is offline Cadillac Owners Connoisseur
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    Re: Question about Dexcool for the Northstar 4.6

    Quote Originally Posted by submariner409 View Post
    AJ....Sure: the corner supermarket, for .89 a gallon, and the dealership charges you $3.89 a gallon. The local Ford parts runner buys the stuff by the case at our local Acme. "You can s**t the fans, but you can't s**t the players" (Dexter Manley, Washington Redskins)
    rndthm, DIY with help from your factory service manual. A simple job, and you'll learn a lot.
    I have never seen clean drinkable water at a dealer that I used to fill a system.
    I have always used to dirty crap out of the hose.
    I know that I shouldn't, but that is the way it is done.

  7. #6
    dkozloski's Avatar
    dkozloski is offline Cadillac Owners 10000+ Posts
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    Re: Question about Dexcool for the Northstar 4.6

    Water from a municipal water system these days is going to have a relatively high Ph adjusted to keep from leaching lead from home soldered plumbing systems. Other than that there won't be much else that matters.
    Don't mess with Binky Bear!


  8. #7
    AJxtcman's Avatar
    AJxtcman is offline Cadillac Owners Connoisseur
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    Re: Question about Dexcool for the Northstar 4.6

    Quote Originally Posted by dkozloski View Post
    Water from a municipal water system these days is going to have a relatively high Ph adjusted to keep from leaching lead from home soldered plumbing systems. Other than that there won't be much else that matters.
    If you drink the water at the dealer ship you will go home.
    It is soooooo bad every shop has it own bottled water and they also supply it in the waiting area.
    If we had good air we could use the snow, but it is soooooo dirty also.
    This state sucks. I need to get back to WA or Alaska.

  9. #8
    dkozloski's Avatar
    dkozloski is offline Cadillac Owners 10000+ Posts
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    Re: Question about Dexcool for the Northstar 4.6

    Anchorage, Alaska has the highest quality rated public water system in the U.S. The water in Fairbanks is hard as hell.
    Don't mess with Binky Bear!


  10. #9
    codewize's Avatar
    codewize is offline Cadillac Owners Master
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    Re: Question about Dexcool for the Northstar 4.6

    50/50 with distilled water. I would never use tap water in a coolant system. Way to many minerals.

    The premix is fine also but you're paying more money for half the coolant. Distilled water here is $ .58 in Wal-Mart

    And it is a pretty easy do-it-yourself job.
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  11. #10
    rndthm is offline Cadillac Owners Member
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    Re: Question about Dexcool for the Northstar 4.6

    what type of water is it in the premix that they get from gm ?

  12. #11
    z06bigbird is offline Cadillac Owners Connoisseur
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    Re: Question about Dexcool for the Northstar 4.6

    Quote Originally Posted by rndthm View Post
    what type of water is it in the premix that they get from gm ?
    Great question, but I am not sure we can locate the person who can give us the real answer.

  13. #12
    AJxtcman's Avatar
    AJxtcman is offline Cadillac Owners Connoisseur
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    Re: Question about Dexcool for the Northstar 4.6

    Dex cool premix at a dealer. I have never seen this at a dealer or in the Chemical catalog. I will need to take a closer look, but I think it is not available from GM.

  14. #13
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Question about Dexcool for the Northstar 4.6

    The Guru once told me that the factory uses ionized water at the factory when I asked.

  15. #14
    AJxtcman's Avatar
    AJxtcman is offline Cadillac Owners Connoisseur
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    Re: Question about Dexcool for the Northstar 4.6

    osmosis?

  16. #15
    rndthm is offline Cadillac Owners Member
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    Re: Question about Dexcool for the Northstar 4.6

    I stopped by one of the dealerships this morning to look at thier bottle of premix. It said ac delco and dexcool on it but after reading the back of it!!! This is not a premix.... you are supposed to mix it with water from what I read on the directions on it and on the back the directions said to mix it with tapp water. Why would gm put in the directions to use tapp water???

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