Question about 2000 Cadillac Seville

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2000 cadillac seville sts- it is overheating only when I drive it. Changed the water pump, two therosdats and flushed it three times. Then I put block seal it. but no luck still overheats when I drive it. Do you think its a cracked head? or something else?

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  • ateelander May 10, 2009

    I had the same problem with my 1998 4.6 Northstar STS. After having my GM dealer replace the water pump and flush the radiator and heater core 2 times, the radiator blew. This cost another $700. I spent all of 2008 chasing the coolant problems (all with my local GM dealer) when it was most likely that the head gaskets failed or were in the process of failing. It is very likely that my GM dealer miss-diagnosed the head failure and this is what blew out the radiator. Pressure from the pistons blowing past the compromised gaskets caused the radiator to break where at its (weakest point) as the radiator is part plastic and part aluminum. I had the engine completely rebuilt and I now have a strong, smooth running Northstar with a 3 year/100,000 mile warranty. It is hard to do this repair yourself as according to GM, there are special ($700) tools required. My GM dealer would not offer a guaranty with the head repair. Mine is now running better than it ever has and the rebuild does not require stop-leak any more. The car does not use a quart of oil every 800 to 1000 miles anymore, I have had the car back for two months now and it hasn't used a drop of oil. It doesn't leave puddles on the floor anymore either. I am back in love with this wonderful car again after our temporary breakup. You can read my story at

  • Eric Heifetz
    Eric Heifetz May 11, 2010

    Are the radiator cooling fans operating ?

  • honeymokey
    honeymokey May 11, 2010

    Pressure check it. If you ran it hot at one time it may be the head gaskets or head-bolt problem.

  • Dave Winterburn May 11, 2010

    Are you sure the water is moving in the engine to rad? Sounds like an air pocket. If you had a cracked head, you would notice water under the car and water in your oil. Look under the oil fil cap and see if it has a white foam build up on it. With the engine running, and the rad cap off, do you see bubbles in the water? One or two is ok, alot is a problem. Is the fins on the rad clear? Missing fins will over heat the car also. If the car has AC check the fins on the conds. Its the rad in front of the cooling rad.



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Check to see if cooling fans are working. if not replace fans or fan sensor. check oil. if there is coolant in the oil, you may have a cracked head or a defective head gasket.

Posted on May 15, 2009


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