Are there two thermostats on '97 Eldorado? - Page 5
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Cadillac Seville / Cadillac Eldorado Forum Discussion, Are there two thermostats on '97 Eldorado? in Past Cadillac Vehicle Discussion; Hi Ranger. We had already replaced leaking radiator, thermostat, water pump, and bypassed heater core when I found this site. ...
  1. #61
    geegeeburr is offline Cadillac Owners Member
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    Re: Are there two thermostats on '97 Eldorado?

    Hi Ranger. We had already replaced leaking radiator, thermostat, water pump, and bypassed heater core when I found this site. We put in the new purge line and sensor/sending unit, and thought problem was fixed. Until overheating yesterday, idling on the hill.

    I did do a block test, but upon reviewing youtube videos of block tests, I think our kit may have been defective, because the aerator-looking-thing only had bubbles coming from one tiny little spot. I've gone and gotten a new block test kit, and am fixing to try again...

    EDITED TO ADD: We did not have to keep topping off the coolant, like we were before, until yesterday, when it overheated. Then I had to replace coolant.

    ----------

    Well, there you go. The new block test worked properly- and it turned color. Not yellow, but went from sky blue to like a turquoise. So, that's a head gasket, then, huh?

  2. #62
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Are there two thermostats on '97 Eldorado?

    Yeah, sounds like you're in the early stages of a HG failure.

  3. #63
    geegeeburr is offline Cadillac Owners Member
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    Re: Are there two thermostats on '97 Eldorado?

    Awesome.

    On to the next question, then. I've read tons of threads here about whether the hope-in-a-bottle gasket sealants work. I understand that most of the time, with Northstars, the cause of HG failure is the bolts pulling loose, and the miracle in a bottle WON'T fix that. (Thank you, basscat.) But what if it is the gaskets, and not the bolts, is there any way to tell? Because a few people have said they used Blue Devil and bought themselves a few months.

    As I'm sure you've guessed from this question, we can't really afford to shell out the 2-5K to fix-it-right. So, do I try the gunk and hope it buys us enough time to get a decent replacement car? Or try to sell it... I mean, would anyone really even BUY a 16-year-old car with head gasket failure, even if it's a Caddy?

  4. #64
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    It's unlikely that it's JUST the gaskets. If you plan on ever repairing the engine, DO NOT pour anything into the cooling system.

    And DON'T sell the car without letting the buyer know about the problem, and what needs to be done to fix it.

  5. #65
    geegeeburr is offline Cadillac Owners Member
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    Re: Are there two thermostats on '97 Eldorado?

    Quote Originally Posted by MoistCabbage View Post
    And DON'T sell the car without letting the buyer know about the problem, and what needs to be done to fix it.
    No, of course not. Mama raised me better'n that!

    Quote Originally Posted by MoistCabbage View Post
    If you plan on ever repairing the engine, DO NOT pour anything into the cooling system.
    That's just it- I know we can't repair it ourselves, and can't really see paying out a lot to fix it. So the basic question for me is- goop in the engine, and drive it until it explodes, or find a buyer who is willing to invest so much work and $ into such an old car. From the way you guys talk, maybe that buyer is out there, because many of you clearly love these cars.... (I think you all must look at engines the way I look at old, beat-up furniture- they might seem like a mess, but they can be made awesome again with a lot of love, and some know-how?) But it's hard to wrap my head around that idea, because to me, a car is pretty much just a box on wheels, any one being essentially interchangeable with any other. With no offense intended.

  6. #66
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Quote Originally Posted by geegeeburr
    But it's hard to wrap my head around that idea, because to me, a car is pretty much just a box on wheels, any one being essentially interchangeable with any other. With no offense intended.
    YOU MONSTER!!!

    If the car is in otherwise near perfect condition, both mechanically and aesthetically, it's worth $1,000 or less to someone willing to invest the time and/or money to fix it.

  7. #67
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Are there two thermostats on '97 Eldorado?

    If all you are looking for is to buy time, hope-in-a-bottle might do that for you.

    If the HG is leaking, the threads have failed. The only question is, which went first causing the other to fail, the HG or the threads. That theory has been the subject of many threads.


    a car is pretty much just a box on wheels, any one being essentially interchangeable with any other
    Blasphemy, blasphemy I tell you.

  8. #68
    geegeeburr is offline Cadillac Owners Member
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    Re: Are there two thermostats on '97 Eldorado?

    Well, thanks all. I guess I'll soon be joining the ranks of wishful thinkers who try the miracle in a bottle with the rationale that it "can't make it much worse."

    Maybe I'll post a new thread with the whole, "Here's what we tried, and here's what it did..." (Or didn't do, as the case may be.) I saw one guy who kept checking in with updates for several months, until his HGs failed again. (someone discovered emoticons!)

    Y'all are good guys. And very helpful. And often funny, too. I've appreciated all your help.

  9. #69
    RippyPartsDept's Avatar
    RippyPartsDept is offline Hi, I'm Chris - Please Read My Signature
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    Re: Are there two thermostats on '97 Eldorado?

    point of order back to the two thermostats topic:

    the Duramax Turbo Diesel engines have two thermostats (that open at different temperatures) because the turbo is cooled on a separate cooling circuit than the rest of the engine.

    so one t/stat is for the turbo cooling and the other is for the engine
    Chris Heath (RippyPartsDept) is an ASE Certified GM Parts Consultant at Rippy Automotive
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