Question about 1997 Cadillac DeVille

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Over heating and loosing coolant

Temp. cooling fans cut in at 106* C. and out at 100* C. Will sit and idle for hours without loosing coolant. When driving above 80 km/h,will expell coolant and overheat. Done pressure test on system,16 psi. maintained steady for 90 minutes.. New rad,/water pump and hoses.. Puzzled.. hope you can help.. Thanks Grumpy...

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  • mrgrumpyhere Sep 11, 2008

    I am looking for a FREE service manual for this car. can you help? Thanks ,, Grumpy

  • mrgrumpyhere Sep 12, 2008

    Sorry Jack, I should have mentioned that the thermostat was the First thing that I checked and replaced, also done a combustion check for gases in the cooling system,(found none), ergo; no head gasket or cyl. head problems... Still have problem...Thanks for trying.. mrgrumpyhere...



    P.S. still looking for site to download FREE service manual ror 97 Deville.

  • DonAtkinson Dec 04, 2008

    Same Problem- Changed thermostat, radiator,water pump, flushed coolant system,pressure test system and cap,and it still overheats.

  • mrgrumpyhere Dec 14, 2008

    Note to thunderboltz; Your solution, stretching head bolts when hot, is a real possability. that will be the next thing I check... Thanks, Mrgrumpyhere......

  • Rob
    Rob May 11, 2010

    I shall loose the coolant upon you, ye vermin of overheating!

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Two things to check .first make sure you have proper air flow through the ac condenser .Second thing I once ran across this problem with a gm product all tests showed no gasses in coolant but i removed the spark plugs saw slight traces of coolant on 2 plugs. the fix was strecthed head bolts when engine got hot they strech just enough too cause this problem.

Posted on Dec 13, 2008

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Over heating and loosing coolant

Posted on Dec 01, 2008

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Have you checked the thermostat mate? likely cause of all these problems, just boil it at its specified temperature and see if its any good. if you cant be bothered just buy a new thermostat and gasket (not even $5) and its even easier to fit them

good luck

jack

Posted on Sep 11, 2008

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If the switch to run the fan does not turn it on until the engine is too hot, then you probably need a new fan switch.

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