Adding STOP LEAK to 2004 Cadillac DeVille Coolant - Page 2
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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; Generally, nobody blindly sides with "the dealer". GM has changed their overall recommendations for nuisance leak prevention. The tablets were ...
  1. #16
    Submariner409's Avatar
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    Re: Adding STOP LEAK to 2004 Cadillac DeVille Coolant

    Generally, nobody blindly sides with "the dealer". GM has changed their overall recommendations for nuisance leak prevention. The tablets were added on the assembly line to prevent possible nuisance weeps and thus avoid warranty comebacks. The tablets were NEVER used by GM as a possible head gasket leak preventive - NEVER.

    A LOT of us have played with almost every sort of snake oil, goop, liquid, powder, and welding rod on those endless shelves of magic in every parts store on earth and have come to the conclusion that most advertising is purely sales propaganda. Also, the conclusion that a right fair amount of "advice" given in forums is pure flight of fancy, and in some cases can be disastrously wrong. I'll go out on a limb and state that the 20 or so regular "advisors" in these FWD Northstar forums has been there/done that, does a lot of homework, is an active car builder/racer/detailer or any combination thereof.

    Why would ANY sealant product claim or even state that an additive, freely circulating in a cooling system, would have a selective sealing effect (the right ("rear) cylinder head gasket) ??? It may have something to do with the number of Northstars that seem to exhibit failed head gasket symptoms in the vicinity of #1 or #3 cylinder .......... but you sure can't hang your hat on that one.

    Additives and snake oil - Google the word "spiff" and do some homework. Then ask yourself which magic the counter salesman pushes today.

    Google "cadillac northstar engine water pump socket" - and in this case, you get what you pay for. Pictures of the whole enchilada in my albums. That socket is almost 5" in diameter.
    SUPER LAC DEVILLE and Jfarr like this.

  2. #17
    DevilleNut is online now Cadillac Owners Fanatic
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    Re: Adding STOP LEAK to 2004 Cadillac DeVille Coolant

    Submariner,

    Thanks for the links. I followed the one to eBay and put one on order. You can never have too many tools!

    Bob
    SUPER LAC DEVILLE likes this.

  3. #18
    Jfarr is offline Cadillac Owners Member
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    Re: Adding STOP LEAK to 2004 Cadillac DeVille Coolant

    Factory service manual (1997) says to use Goodwrench or Havoline DEX-COOL and add three engine supplemental sealant (GM #3634621) pellets to the lower radiator hose.
    I find it odd that the factory service manual would recommend using stop leak but at the risk of experiencing a head gasket or coolant leak on a 98,000 mile car, I plan on using the pellets as well as the proper 50% mix of DEX-COOL.

    BTW, where are the coolant drain plugs on the block?

  4. #19
    JimD is offline Cadillac Owners Connoisseur
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    Re: Adding STOP LEAK to 2004 Cadillac DeVille Coolant

    Quote Originally Posted by Jfarr View Post
    Factory service manual (1997) says to use Goodwrench or Havoline DEX-COOL and add three engine supplemental sealant (GM #3634621) pellets to the lower radiator hose.
    Good luck finding Havoline branded anything. There are several other labels that are licensed to bottle and sell DEX-COOL with Prestone being one of those. Be sure the container says "DEX-COOL" and not DEX-COOL "compatible".

    I find it odd that the factory service manual would recommend using stop leak but at the risk of experiencing a head gasket or coolant leak on a 98,000 mile car, I plan on using the pellets as well as the proper 50% mix of DEX-COOL.
    The terms 'supplement' and 'stop leak' are not interchangeable. The supplement can not and never was intended to prevent or repair (patch) anything to do with future or current head gasket failure.

    BTW, where are the coolant drain plugs on the block?
    There are no block coolant drain spigots.
    Jfarr likes this.

  5. #20
    MoistCabbage's Avatar
    MoistCabbage is online now Cadillac Owners 10000+ Posts
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    The pellets are designed to stop tiny "nuisance leaks", and will do ABSOLUTELY NOTHING to prevent or repair an HG issue.

    The FSM can't update itself, GM no longer recommends or uses the pellets, as they can clog small coolant passages.

    Coolant type is totally irrelevant. There's nothing special about GM engines or cooling systems that makes them REQUIRE DEX-COOL. DEX was designed to be a long life coolant, which most name brand coolants are now anyway. However, nobody here will recommend you follow the long life DEX or conventional change interval of 5 years. Regardless of coolant type, drain and fill every 2 years, 3 max.

    Block drains are in pre '95 engines only.
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  6. #21
    Ranger's Avatar
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    Re: Adding STOP LEAK to 2004 Cadillac DeVille Coolant

    Quote Originally Posted by Jfarr View Post
    Factory service manual (1997) says to use Goodwrench or Havoline DEX-COOL and add three engine supplemental sealant (GM #3634621) pellets to the lower radiator hose.
    That is out dated and no longer recommended.
    Jfarr likes this.

  7. #22
    Submariner409's Avatar
    Submariner409 is offline If it won't run, install a sound system
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    Re: Adding STOP LEAK to 2004 Cadillac DeVille Coolant

    Quote Originally Posted by Jfarr View Post
    Factory service manual (1997) says to use Goodwrench or Havoline DEX-COOL and add three engine supplemental sealant (GM #3634621) pellets to the lower radiator hose.
    I find it odd that the factory service manual would recommend using stop leak but at the risk of experiencing a head gasket or coolant leak on a 98,000 mile car, I plan on using the pellets as well as the proper 50% mix of DEX-COOL.
    BTW, where are the coolant drain plugs on the block?
    Post #16, Para. 1 ..............

    The 2002 (02/02 edit) service manual says the same thing. That info is outdated - I have NEVER seen my paper service manual update itself - but if you keep up with the GM Technical Service Bulletins and Service Messages, they are deleted and updated on a regular basis.

    No block drains on your engine - it's in the service manual. Coolant flushing procedures.

    Here's the (outdated) page out of the 2002 Seville GM Helm service manual - cooling section. (You might read the sentence just after the sealant paragraph)
    Jfarr likes this.

  8. #23
    Jfarr is offline Cadillac Owners Member
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    Re: Adding STOP LEAK to 2004 Cadillac DeVille Coolant

    Very good info guys!
    Much appreciated.............

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