Coolant Leak - Cracked block? 99 STS, already studded
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  • 2 Post By Ranger
Cadillac Seville / Cadillac Eldorado Forum Discussion, Coolant Leak - Cracked block? 99 STS, already studded in Past Cadillac Vehicle Discussion; I've been ignoring a coolant leak for the last several months. It's getting worse so with my day off today ...
  1. #1
    ewb4arch is offline Cadillac Owners Member
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    Coolant Leak - Cracked block? 99 STS, already studded

    I've been ignoring a coolant leak for the last several months. It's getting worse so with my day off today I decided to have a look. I "rented" the pressure tester from Vatozone. Pumping it up results in drips coming from around the oil filter/pan. I jacked it up first on the drivers side then passenger to see if that changed anything. Still dripping down the oil pan with either side up.

    Shining a flash light around under there, I found what appears to be hairline cracks in the engine block just below the exhaust manifold. I've attached some photos. Lager version can be found here:

    http://s938.photobucket.com/albums/ad224/ewb4arch/

    Are they cracks? Does that area of the engine have water channels?

    Is there ANYTHING else above the oil pan toward the front of the car that could be the problem? I did replace the water pump & gaskets a few weeks ago so I know that's not it.

    Looks like I may be car shopping,
    Attached Images

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  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Coolant Leak - Cracked block? 99 STS, already studded

    Sure looks like cracks to me............and they're right at the cylinder liner water jacket lower edges - way too far down to be head stud problems.

    This may be one of the very few times I would advocate dumping in a half tube of Bar's Leaks G12BP powder - lower radiator hose only.

    It won't fix anything, but might buy some time - engine block water jacket cracks are terminal..........

  4. #3
    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
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    Re: Coolant Leak - Cracked block? 99 STS, already studded

    Hard to tell if it is a crack or just the way it was cast, but that last pic looks suspicious.
    98eldo32v and 98eldo32v like this.

  5. #4
    ewb4arch is offline Cadillac Owners Member
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    Re: Coolant Leak - Cracked block? 99 STS, already studded

    That's what I was afraid of. I'm no car expert, so I wanted opinions before I take it somewhere. Not sure I'll bother taking it anywhere, especially if a couple more people concur about the cracks.

    I add about 1/2 gallon of coolant every week and a half so I have some time to shop around for something else. It's pushing 200K and has a few other issues, so I don't think I'll bother with an engine swap.

    Thanks for the reply Sub. Hope your 4th is going well.

  6. #5
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Looks like cracks to me too.

  7. #6
    ewb4arch is offline Cadillac Owners Member
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    Re: Coolant Leak - Cracked block? 99 STS, already studded

    It took 20 pictures to get the three I posted. In the shadow a little further right, it looks even worse than these pics indicate. Looks like I found the leak at least. Sucks it can't be fixed though.

  8. #7
    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
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    Re: Coolant Leak - Cracked block? 99 STS, already studded

    I'd spray it with Brakleen and then pressurize it again. If it is a leaking crack it should become pretty evident once cleaned.

  9. #8
    ewb4arch is offline Cadillac Owners Member
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    Re: Coolant Leak - Cracked block? 99 STS, already studded

    Took Ranger's advice. Cleaned it up with Brakleen, blew it dry with the output of my shopvac and pumped the pressure up again. It was a little hard to see until I blew on it with the shopvac again. Could clearly see the coolant seeping out of the crack. Stick a fork in it

    Thanks everyone for saving me a hour's of shop time somewhere for confirmation. Time to post it on the classifieds.

  10. #9
    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
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    Re: Coolant Leak - Cracked block? 99 STS, already studded

    Sorry to hear that.

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