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Thread: 1999 Seville OVERHEATING

  1. #16
    Ranger's Avatar
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    Re: 1999 Cadillac Seville OVERHEATING :(

    Test it again or have a cylinder pressure test done to confirm it. It should not be hard to diagnose to be sure before hauling it back up north.


  2. #17
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    Re: 1999 Cadillac Seville OVERHEATING :(

    If it is the hg, would it overheat all the time? I tried to get it to overheat last night by driving around for about an hour (fast, stop and go, everything) and I only got the temp to raise about and 1/8 inch and then it went back down after about a minute but the gurgling water sound seems to be getting louder/worse.

  3. #18
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    Re: 1999 Cadillac Seville OVERHEATING :(

    Usually in the early stages of a HG failure it will overheat under a load, a hill climb or WOT.

  4. #19
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    Re: 1999 Cadillac Seville OVERHEATING :(

    I have not had the car overheat under a load yet. Everytime has been in stop and go traffic or at stop lights. I drove from Kansas City tothe middle of Iowa about a month ago and I did not have any problems. The temp was chilly on the way there but 50's on the way back. I also drive the car to work and back and anywhere I need to go without it overheating (unless I get in stop and go traffic). Whats is the gurgling noise that I hear? Can the be part of the problem?
    Last edited by benmack; 03-18-09 at 06:16 PM. Reason: addition

  5. #20
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    Re: 1999 Cadillac Seville OVERHEATING :(

    What is your definition of "overheating" ? Where on the picture is your idea of "overheating" ?

  6. #21
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    Re: 1999 Cadillac Seville OVERHEATING :(

    It will raise up to about 5/8 to 6/8. What is that girgling noise and how much $$ at a mechanic to fix?

  7. #22
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    Re: 1999 Cadillac Seville OVERHEATING :(

    The gurgling noise is air in the heater core.

    What is 5/8 to 6/8? Where on that dial in temps listed?

  8. #23
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    Re: 1999 Cadillac Seville OVERHEATING :(

    210 - 225 degrees is what it raised to then goes back down. When it raises it takes about 4 seconds to get that high, then after a minute or so (depends everytime) it goes back down. It completley overheated once where I had to pull over. I hooked it up to a computer and did not get anything back.

    Should I be worried about the gurgling?
    Thanks for all the help!

  9. #24
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    Re: 1999 Cadillac Seville OVERHEATING :(

    The gurgling COULD be an indication of a problem if the purge line is clear.

  10. #25
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    Re: 1999 Cadillac Seville OVERHEATING :(

    If you don't have the A/C on or heater in Defrost mode the fans don't come on until the temperature gets to 225, and then only one starts. Two fans run in fast mode at 238 degrees. Did the car overheat (steam out of the surge tank) or did the DIC tell you to idle engine or stop the engine?

  11. #26
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    Re: 1999 Cadillac Seville OVERHEATING :(

    I popped the hood and there was steam and also coolant boiled out of the cap. I let it cool and made it to a gas station and added more coolant. I then made it all the way home (about 15 minutes) without the temp gauge raising. I have had the fan sensor replaced and now it raises to about the 225 mark if I am driving downtown otherwise it is fine.

  12. #27
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    Re: 1999 Cadillac Seville OVERHEATING :(

    Just drive it and keep an eye on it. IF it is the HG, it will let you know in due time.

  13. #28
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    Re: 1999 Cadillac Seville OVERHEATING :(

    What is the coolant level in the surge tank, cold. Empty, 1/2 full, or at the top ??? No questions this time: answers only.

  14. #29
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    Re: 1999 Cadillac Seville OVERHEATING :(

    It is full, just to the top of where the divider is. There is room left for expansion.

  15. #30
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    Re: 1999 Cadillac Seville OVERHEATING :(


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