1999 Cadillac Seville OVERHEATING :(
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Northstar Engines and System Technical Discussion Discussion, 1999 Cadillac Seville OVERHEATING :( in Cadillac Engine Technical Discussion; I bought a 99 seville in Jan. with 108,000 miles. I drove to Kansas City, MO from Wisconsin two days ...
  1. #1
    benmack is offline Cadillac Owners Member
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    1999 Cadillac Seville OVERHEATING :(

    I bought a 99 seville in Jan. with 108,000 miles. I drove to Kansas City, MO from Wisconsin two days after I bought it (moved). The car drove fine. The first weekend I drove downtown the car overheated. I found some threads online that say it is the head gasket. I brought the car to a cadillac dealership and they said "yes it is the head gasket". I brought the car to another place and they ran a test (mixed some liquid with the coolant and did not see a color change) and found not to be a head gasket. This mechanic stated there is nothing wrong with the head gasket and replaced the fan sensore and sent me on my way. One week later I drove downtown and the temp has from the middle about an 1/8 inch (about 3/4 of the gauge). After it raised it went back down after about a minute. When I pull off from a stop light I can hear air bubbles. I need help and hoping this is an easy fix before I drive it back to WI to the dealership to get fixed.

    Any help PLEASE!!!!

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  3. #2
    JimD is offline Cadillac Owners Connoisseur
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    Re: 1999 Cadillac Seville OVERHEATING :(

    There is an air purge line that begins at a hollow bolt above the water pump cover and flows through the throttle body and terminates at the top of the coolant reservoir. Be 100% certain that line is flowing a slow steady trickle of coolant by removing the rubber hose from the top of the reservoir with the engine at idle (cold engine!!).

    If there is no coolant flow, locate and remove the blockage.

    Once the air is purged from the system, you can expect the coolant level in the reservoir to drop a little so keep an eye on the level. Once again, with a cold engine.

  4. #3
    benmack is offline Cadillac Owners Member
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    Re: 1999 Cadillac Seville OVERHEATING :(

    I took your advice Jim and checked for blockage. The coolant was flowing good and fast. The noise (water bubbles) is coming from the console. Any other options or thoughts?????????

  5. #4
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 1999 Cadillac Seville OVERHEATING :(

    Has to be in the heater core....they can be a PITA to purge of all air bubbles. Try a few judicious high rpm moderate accelerations in gear position 2. Let the engine run up to the 1 - 2 shift with moderate throttle and then ease it up to over 5000 rpm and let it coast back down. Watch the temp gauge (it probably won't move) and do it again. Let the car cool, and maintain the coolant level at about halfway up the tank, cool.

  6. #5
    benmack is offline Cadillac Owners Member
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    Re: 1999 Cadillac Seville OVERHEATING :(

    It will make the bubbling sound even when in park and i raise the RPM's, I can start to hear it at about 2000 RPM's. Do you think the heater core needs to be replaced or is there a way to bleed the system (if brought into a mechanic). I need to try and figure out if it is worth driving back to WI (still under warranty) from Kansas City, MO or pay to get fixed here.

  7. #6
    Eldo1953's Avatar
    Eldo1953 is offline Cadillac Owners Enthusiast
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    Re: 1999 Cadillac Seville OVERHEATING :(

    If you still have warranty I would take it back imo.

  8. #7
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    Destroyer is offline Cadillac Owners Master
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    Re: 1999 Cadillac Seville OVERHEATING :(

    yeah, change the water pump, check the purge line, change the t stat and do all of what everyone is telling you to do. After you get done wasting all that time and money................it'll be the head gaskets. I'm rarely wrong on this.

  9. #8
    benmack is offline Cadillac Owners Member
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    Re: 1999 Cadillac Seville OVERHEATING :(

    Thats is what I am guessing it is after everything I have read. Is there a reason when I had the dye test done it showed nothing?

  10. #9
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    Ranger is offline Cadillac Owners Member
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    Re: 1999 Cadillac Seville OVERHEATING :(

    Maybe they did the test wrong. You can't do it after you add fresh coolant or it will give a false negative. From what you are saying I doubt you'll make it to Wisc. Your symptoms do not sound promising I hate to say.

  11. #10
    benmack is offline Cadillac Owners Member
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    Re: 1999 Cadillac Seville OVERHEATING :(

    That's what I am afraid of. Towing is not in the warranty. I am trying to eliminate everything so I am 100% confident in spending the money to get the car back to WI.

  12. #11
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 1999 Cadillac Seville OVERHEATING :(

    Read the warranty closely and talk to them first. Some warranties have loopholes. I'd hate to see you go through the trouble and expense to get it back up here only to have them say oops, sorry.

  13. #12
    benmack is offline Cadillac Owners Member
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    Re: 1999 Cadillac Seville OVERHEATING :(

    I read it upside down and backwords. Have been dealing with them since the end of Jan. The only way they will fix it is if I bring it up there or they will send me a check for $2500 to get it fixed here but the cheapest I have found is $3500 after taxs.

  14. #13
    ryannel2003's Avatar
    ryannel2003 is offline Cadillac Owners Connoisseur
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    Re: 1999 Cadillac Seville OVERHEATING :(

    You're very lucky to have a warranty that covers HG's. Most people are left to pay the $3500 to get them fixed. Oh btw, make sure that warranty includes timeserting. Most don't, and if the car isn't timeserted it will fail again.

  15. #14
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 1999 Cadillac Seville OVERHEATING :(

    Yeah, even if you have to foot the Timeserts out of your own pocket, DO IT.

  16. #15
    benmack is offline Cadillac Owners Member
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    Re: 1999 Cadillac Seville OVERHEATING :(

    Is there something I can do to make sure they fix the hg? I don't want to bring it all the way up there and have them do the same die with coolant test and tell me it's not the hg.

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