Adding STOP LEAK to 2004 Cadillac DeVille Coolant
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Adding STOP LEAK to 2004 Cadillac DeVille Coolant in Past Cadillac Vehicle Discussion; Guys, I've read on this forum that it is a good idea to add a STOP LEAK product to the ...
  1. #1
    DevilleNut is offline Cadillac Owners Member
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    Adding STOP LEAK to 2004 Cadillac DeVille Coolant

    Guys,

    I've read on this forum that it is a good idea to add a STOP LEAK product to the coolant in the Northstar engines to help prevent head gasket leaks. I was going to have the coolant in my 2004 DeVille changed and I called the dealer to ask them what product should be used for this. The service manager told me that by 2004 the coolant leak problem had been fixed and adding the STOP LEAK was no longer necessary.

    Do all of you agree that this is no longer necessary, or is the Cadillac service manager a casualty of wishful thinking?

    Thanks,

    Bob

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  3. #2
    dusty256 is offline Cadillac Owners Fanatic
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    Re: Adding STOP LEAK to 2004 Cadillac DeVille Coolant

    Stop leak tabs are not needed . Been discussed a lot on here that they where originaly used to stop Nuance leaks .

    Just keep the coolant changed every two years .

  4. #3
    Ranger's Avatar
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    Re: Adding STOP LEAK to 2004 Cadillac DeVille Coolant

    I don't know where you read that, but it was NOT on this forum. There is NO snake oil (in any form) that will prevent HG failure. Least of all the sealant tabs that GM used to use. The service manager was right.

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    The sealant tabs were intended for "nuisance leaks", and they're not used anymore, as they clog small coolant passages.

    DO NOT pour any type of block seal product into the system.

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    Re: Adding STOP LEAK to 2004 Cadillac DeVille Coolant

    I've read on this forum that it is a good idea
    to add a STOP LEAK product to the coolant
    in the Northstar engines to help prevent head gasket leaks.

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

    I have been on this forum for quite a while -
    and I can say I have NEVER heard a legitimate source -
    EVER - recommend ANY stop-leak product -
    to PREVENT OR CURE a head gasket failure -

    DO NOT USE IT - EVER -

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    Re: Adding STOP LEAK to 2004 Cadillac DeVille Coolant

    You sure didn't read that - from any credible source (including the latest GM TSB's) - in any Northstar forum in CF.

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    Re: Adding STOP LEAK to 2004 Cadillac DeVille Coolant

    Old post maybe?

    Stop Leak of any kind is a bad idea. The only thing it consistently does is clog stuff.

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    dusty256 is offline Cadillac Owners Fanatic
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    Re: Adding STOP LEAK to 2004 Cadillac DeVille Coolant

    I think the maintance tips should be changed

    it still shows this

    Changing Coolant and Using the Correct Number of Tablets (check this discussion for references) (more) (more) (more) (more) : (back to the top)

    The manual will show three of the GM coolant supplement pellets for the Northstar. The 4.x engines were recommended for six of them due to the greater chance of an internal leak of coolant directly into the oil. I always recommend six of the GM coolant supplement pellets / two tubes of the BarsLeaks golden seal powder for either engine. It just provides extra protection against leakage and will not hurt a thing.

    A good time to drain and refill the system with fresh 50/50 DexCool/distilled water is when the 5-year/100K life of the DexCool from the OEM fill is near....

    The water pump will be the easiest one you have ever changed...hard to believe the dealers can somehow justify charging $570 to change one - which is about $450 profit, I would say... With the special tool it's a snap. Remember that the water pump cartridge is removed by turning it clockwise as viewed from over the left front fender looking into the water pump cavity from the backside after removing the cover. It is installed by turning the special tool counterclockwise...a "left handed thread" install. When the old pump is out remember the o-ring seal that is in a groove in the water crossover casting. Look inside the housing when the water pump is out and you will see it. Put a new o-ring in the groove (should be in the kit with the pump) and make sure it is seated and lubed with antifreeze when installing the new pump.

  10. #9
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    Quote Originally Posted by DevilleNut View Post
    Guys,

    I've read on this forum that it is a good idea to add a STOP LEAK product to the coolant in the Northstar engines to help prevent head gasket leaks. I was going to have the coolant in my 2004 DeVille changed and I called the dealer to ask them what product should be used for this. The service manager told me that by 2004 the coolant leak problem had been fixed and adding the STOP LEAK was no longer necessary.

    Do all of you agree that this is no longer necessary, or is the Cadillac service manager a casualty of wishful thinking?

    Thanks,

    Bob
    I tried it

    Doesn't work

    Think it made it worse

    Eatn twice the coolant now as oppose to before I used it

    Jus a waste of $$$ & a BAD IDEA



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    Re: Adding STOP LEAK to 2004 Cadillac DeVille Coolant

    Quote Originally Posted by SUPER LAC DEVILLE View Post
    I tried it

    Doesn't work

    Think it made it worse

    Eatn twice the coolant now as oppose to before I used it

    Jus a waste of $$$ & a BAD IDEA
    I've never ridden in a car with you, but if I had to guess, I would say your foot made it worse.

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    SUPER LAC DEVILLE's Avatar
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    Quote Originally Posted by Aztec ETC ECS View Post
    I've never ridden in a car with you, but if I had to guess, I would say your foot made it worse.
    I'm not sure why u would say that...

    I don't race my Deville,

    Aside of gas prices... It's a Cadillac, not a hot rod...


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    Re: Adding STOP LEAK to 2004 Cadillac DeVille Coolant

    OK. My bad.

  14. #13
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    Re: Adding STOP LEAK to 2004 Cadillac DeVille Coolant

    Quote Originally Posted by dusty256 View Post
    I think the maintance tips should be changed

    it still shows this

    Changing Coolant and Using the Correct Number of Tablets (check this discussion for references) (more) (more) (more) (more) : (back to the top)
    The manual will show three of the GM coolant supplement pellets for the Northstar. The 4.x engines were recommended for six of them due to the greater chance of an internal leak of coolant directly into the oil. I always recommend six of the GM coolant supplement pellets / two tubes of the BarsLeaks golden seal powder for either engine. It just provides extra protection against leakage and will not hurt a thing.
    You certainly did an "about face" from your Post #2 (which was - and still is - correct info). Remember - the 1996 service manual was printed in 1995 and edited in 02/96. GM advice on coolant tablets in the Northstar has/was changed in 2004 and a couple of times later. My 2002 service manual says to use 3 crushed tablets in the lower hose at coolant exchange - but that, too has changed. I have used NO tablets since 2005 and my engine uses not one drop of coolant in 2 years. Our basic advice, based on experience and GM recommendation, is that if you had no nuisance weeps prior to a coolant exchange, you don't need to install the tablets/powder. Why risk clogging a coolant passage or heater core ?

    The stuff in question is Bar's Leaks tablets #HDC or the equivalent powder #G12BP. Google "bar's leaks product sheet". It's ground up ginger root, walnut shells, other organic fibers and a water pump seal lubricant (not needed with DEX-COOL). It works by building a "beaver dam" at a small weep point. Will it do anything for suspected failing head gaskets ?? NO !! (That's "NO !!!")
    SUPER LAC DEVILLE likes this.

  15. #14
    DevilleNut is offline Cadillac Owners Member
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    Re: Adding STOP LEAK to 2004 Cadillac DeVille Coolant

    Guys,

    Thanks for all of the replies. I asked this question because:

    1) A forum that I read on the Northstar engine (I thought there was a link to it from here) stated that stop leak should be added to the coolant to help prevent a leaking rear head gasket.

    2) A television auto program showcased a liquid product by Bars Leaks, and the hosts of the show specifically stated that it helped to eliminate coolant leaks from rear head gaskets in the Northstar engines.

    Sounds like most of you side with the dealer, so that's the way that I'll probably go.

    Bob

    ----------

    Dusty,

    Thanks for the info on changing the water pump. Where does one buy this "special tool" for doing the pump change?

    Bob

  16. #15
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    Re: Adding STOP LEAK to 2004 Cadillac DeVille Coolant

    Quote Originally Posted by DevilleNut View Post
    [/COLOR] Where does one buy this "special tool" for doing the pump change?
    http://www.ebay.com/sch/i.html?_odkw...+STAR&_sacat=0

    http://www.ebay.com/itm/WATER-PUMP-R...item3a81cb32c2

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