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Thread: 99 Eldorado - overheating

  1. #1
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    99 Eldorado - overheating

    I got a 99 eldorado thats been having over heating issues for awhile now. I've changed the radiator, and thermostat about 8 months ago. The heator core just busted on me but bypassed it for now. My car still keeps overheating on me agter driving only about 15 miles.. Thr temp goes up n down as im driving. Can someone help me ouy here??? Also would there be a problem if i remove the thermpstat being that therea no heater core right now!??


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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 99 eldorado

    Your question has nothing to do with warranty or dealership problems. Please read the descriptive text in each forum to find out what is supposed to be posted there.

    Moved from Customer Care to Seville/Eldorado.

  4. #3
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 99 eldorado

    Oh boy, another '99. Borrow a block test kit from AutoZone or such. Just pay for the test fluid and run the test after the next overheat episode. Be prepared for the worst.

    P.S.
    DO NOT remove the thermostat. That won't help and will probably make matters worse.

  5. #4
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    Ok thank u. Does it sound like a broken headgasket?

  6. #5
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    It's a possibility. Are you losing coolant? If not, do a search for how to check your purge line.

  7. #6
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    Ive been putting in water because i thought there was a leak and didnt wana keep puting in coolant and losing it, buf then the heater core broke. I dont see a huge leak jus little drips after I drive the car and then it sits for hours. Can the water be evaporating?

  8. #7
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    The water won't evaporate in a sealed system, but if there's a leak, and the system can't hold pressure, yes, it can.

  9. #8
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    Thanks much for your help.. Im gonna check the purge line first, if that doesnt help ill see what my next step may be! One more question, could it be the thermostat may be stuck?

  10. #9
    98eldo32v's Avatar
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    Re: 99 Eldorado - overheating

    How did the heater core bust?

    The heater core will break from being pressurized by a breach in the headgasket. The combustion pressures enter the cooling system making the coolant boil over aka overheating. The combustion pressures will take out the weak points. Heater cores, gaskets, seals.

    Sounds like you've been driving it like this for awhile.


    If your engine temps were getting warm and you had no heat when you turned on the heater, the headgasket is breached. The cherry on the cake is the overheating.

    Welcome to gasketville usa.....

  11. #10
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    Re: 99 Eldorado - overheating

    Quote Originally Posted by jenn_souza81 View Post
    Thanks much for your help.. Im gonna check the purge line first, if that doesnt help ill see what my next step may be! One more question, could it be the thermostat may be stuck?
    -------------------
    could it be the thermostat may be stuck
    NO - the thermostat is not your problem -

  12. #11
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    I was driving and the front passenger seat got about 2"of water n startd smoking. I bypassed it and been driving it since but is overheating and i been putting in water every couple days.. If the head gasket broke could i still be driving it?

    ----------

    Could it be a freeze plug in fromt of the block? Becaus ethats where its leaking from.

  13. #12
    basscatt's Avatar
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    Re: 99 Eldorado - overheating

    Quote Originally Posted by jenn_souza81 View Post
    I was driving and the front passenger seat got about 2"of water n startd smoking. I bypassed it and been driving it since but is overheating and i been putting in water every couple days.. If the head gasket broke could i still be driving it?

    ----------

    Could it be a freeze plug in fromt of the block? Becaus ethats where its leaking from.
    ---------------------------
    If the head gasket broke could i still be driving it?
    YES -


    Could it be a freeze plug in fromt of the block
    NO -
    ----------------

    do a pressure test on the cooling system to locate the external leak -

    do a BLOCK TEST to determine the state of the head gasket -

  14. #13
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    Re: 99 Eldorado - overheating

    I had a young lady come to me a YEAR before the headgasket finally gave them fits on a 2.4 grand am.

    When I first looked at it, I told them it needed a headgasket. It still ran good, they didn't believe me.

    It progressively got worse.

    Until the smoke came.

    A year later, then they believed me.

    It'll run but you're going to loose a lot more parts and create a bigger headache in the long run

  15. #14
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    Thank u. Hoping its not the head gasket. Drove today and didnt overheat at all on me! And drove about 40 miles

  16. #15
    98eldo32v's Avatar
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    Re: 99 Eldorado - overheating

    Drive it about 70 mph on the highway. It if doesn't overheat you maybe lucky.

    I check every hose clamp for tightness, check the coolant crossover seals if you can see them for seepage. If the system is leaking somewhere or taking in air, it's going to eventually overheat.

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