Question about 1997 Cadillac Seville

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Overheating, but not showing on gauge and no flow to top hose in front of motor

I have a 1997 sls with 120,000 on it and it keeps overheating but the gauge never goes above half and the top hose in front of the radiator never gets even a little warm. It keeps blowing coolant out of the overflow hose and will blow it out of the radiator when the cap is off, however it never blows ANY smoke at all. It will start to get a rough idle when its hot. The only thing I can think of is the thermostat. Where is it located and do you have any other suggestions? Thanks.

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  • byron4bushid Jun 01, 2009

    Holy ****! You people are fast and awesome! Thanks a ton! I was hoping it wasn't the head gasket. I just bought the car 3 days ago and it came "as is" with no warranty. lol Other than this, it seems very well maintained and in excellent shape. I would have included the engine info but thought they all came with one northstar v8 rated at 275 hp for that year. My apologies for my ignorance, and thanks again. :)

  • byron4bushid Jun 01, 2009

    Certainly not a problem. When I started the car today to take it back to the place of purchase to have it looked at, it started blowing white smoke real bad for a few seconds.....not good. However, when I pulled onto the lot, the dealer had a 1998 sls in excellent condition with 120,000 miles on it for the same price I purchased this one for. Go figure. lol If the head gasket is blown, would you guys recommend the 1998 sls if the dealer will work with me or will I be looking at the same issues with a car that has the same mileage? Thanks again for your time and knowlege.

    Byron

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Thermostat is stuck closed it is usually located under the flange that your top radiator hose attaches too. but since you didn't include engine information I can't say that with 100% certainty. Usually you just follow the top hose from the radiator. It is attached to a flange that is attached to the motor with two bolts. Remove the hose, remove the two bolts and the flange comes off. The thermostat justs rests in a little depression there remove it and replace it very cheap part. Make sure you use the gasket that comes with the new one. Difficulty rating: easy. Also cheap to have done. There are a couple of Caddy engines though where it is under the alternator and compressor, and the alternator bolt also holds the tensioner for the serpentine belt. Difficulty level goes way up on that one!

Posted on May 31, 2009

  • rjbeg123 Jun 01, 2009

    You know on the weekend you can usually find at least one or two of us bored and ready to help. Your rating is the only thanks we get, so if you can give us the second yes we'd both be grateful. Have a great day!

  • rjbeg123 Jun 01, 2009

    Personally I'd go with the '98 if your blowing smoke on start up (oil in cylinders or head gasket) and have had a couple of the serious overheating issues, there's no telling how much damage was done, dump it if he'll work with you. Mileage isn't as important as a good maintenance records and how those miles were accumulated.

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I agree, it's likely the thermostat. Here is a link to a typical thermostat in a Cadillac.http://www.chiltonlibrary.com/content/images/9104/images/91043p09.gif

Remove the old thermostat as follows:

  1. Drain the coolant to a level below the thermostat housing.
  2. On some vehicles, access is easier if the front-end beauty panel and the air cleaner are removed.
  3. Remove the 2 bolts securing the thermostat housing to the intake manifold.
  4. Remove the thermostat housing.
  5. Remove the thermostat and O-ring from the housing.
Hope this answers your question. All the best.
Greg

Posted on May 31, 2009

  • Greg Margossian
    Greg Margossian Jun 02, 2009

    I agree with one condition; get a CARFAX report on the 98 you're considering. 120K for 11 year old car isn't bad at all but I'd have to wonder why it's going for the same price your 97 cost. Best of luck and give yourself a pat on the back for doing your homework!

    Greg

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The oil burning may also be a consequence of your overheating problem so check the purge line first as described above.

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