Question about 1999 Cadillac DeVille

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1999 cadilac deville

Overheating

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  • biskit420 Aug 06, 2008

    I Have a 1999 Seville and it overheats sometimes. did not have heat, changed the thermostat and still no heat so did a flush and got new cap. i now have heat and can drive farther but it still gets to warm. bth fans work. there are times i drive it and wont give me trouble and sometimes it will overheat then go back down and sometimes it overheats. i dont see any leaks at all other than when it gets hot some will come out the cap even the new one. thanks in advance for any help

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Posted on Sep 11, 2008

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I had a simalar problem with my 2000 Chev truck over heating sometimes. Checked everything, changed the thermosat. Turned out to be a plugged up radiator. I took it to the car wash and presure washed the rad out, no more problems now.

Hope it helps.

Posted on Jan 02, 2009

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How do adjust idle on 92 sedan deville. aic has beeb changed.

Posted on Jan 01, 2009

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You could have a blown head gasket. Have someone you trust check the compression for back pressure. Is the car smoking a white smoke? Is there any evidence of water in your oil? Even without these two symptoms that could be your problem.

Jim

Posted on Dec 21, 2008

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Are you sure the thermostat was in the wrong way ?.

The thermostat is located in the bottom hose unlike most conventional cooling systems.

The thermostat in the Northstar engine is a dual action device.
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