Question about 1999 Cadillac DeVille

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I have a 1999 cadillac deville thats running hot

I replace the water pump thermostat, and radiator, but it still get hot when i come to a stop or just idleing, cool down when driving. someone told me to bleed my radiator. but how do you do that

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  • reco g Mar 22, 2009

    thanks alots this is a very helpful site for people who can't afford to take thier car to a shop



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  • 837 Answers

Have you replaced the drive belt(s) and/or checked the tightness of same?

Posted on Feb 07, 2009

  • 3 more comments 
  • Jay Glendenning
    Jay Glendenning Feb 14, 2009

    Has this helped? If so I would appreciate a FixYa .. Thanks .. Crayz

  • Jay Glendenning
    Jay Glendenning Feb 21, 2009

    Your symptoms are classic to your fanbelt/drivebelt being loose. Sorry that that isn't the "bleeding" procedure you are looking for but here that is ...

    the vehicle on level ground, when cold remove coolant filler cap,
    start the engine and leave it idle.

    Turn heater on full and blower to

    When engine reaches operating temperature watch and listen near
    coolant filler, keep clear as gurgling and hopefully a boil over
    should occur.

    Top off with very warm coolant and wait as it may do it

    for heat inside vehicle if warm replace coolant cap but keep an eye
    on temperature gauge because an Air lock may have moved to the heater core, if so ths proceedure needs to be carried out again from COLD.

  • Jay Glendenning
    Jay Glendenning Feb 21, 2009

    And I would appreciate a FixYa rating in exchange for the Inappropriate .. Thanks

  • Jay Glendenning
    Jay Glendenning Feb 25, 2009

    Have you been able to successfully bleed your system yet?

  • Jay Glendenning
    Jay Glendenning Mar 22, 2009

    I would like to again thank you for your decision to use FixYa. I especially appreciate the FixYa rating .. that is what I am here for .. to provide the best help that I possibly can and for that FixYa ... that is the best way that you as a FixYa customer can thank me for my help .. Thanks again and hope to FixYa soon .. Crayz



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1 Answer

99 cadillac deville runnin hot

Look for the silly stuff. Check for things blocking off the radiator, coolant level, water pump belt, etc. If none of those help, check the cooling fan, coolant temperature sensor, fan relay and fan fuses. If everything there is working, consider a stuck thermostat, an obstruction in the cooling system itself or a failed water pump. Kind of a long shot but engine timing can also make it run hot. Hope this helps.

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On a 4.9L follow the upper radiator back to the engine. This should be the thermostat housing. The thermostat should be inside.
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I bought a thermostat from advance auto parts for my 1999 cadillac deville but I was told that it should only be bought from a cadillac dealership but I used it anyway. I put the thermostat on and the car...

Who did all this work?
Was the water pump bad?
Was the radiator, so clogged it could not be cleaned?

What diagnostics was done?

Is the car actually over heating? That is where you start

All that work may have been for not

When you removed the stat,the temp never went up,only the gauge,
can not run a veh without the stat, the temp sensor needs it in there

Is the exhaust converter partially blocked?
Is the engine running rich

Have the data looked at.

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did you check the thermostat? how about the fan is it working properly? and finally the radiator did you do a flow test on it?

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Overheating can be numerous things: Fans not working, water pump, thermostat, overflow cap, and the list keeps going. When the engine is running and heats ups, feel the heat of the top hose, if the hose isn't hot, the thermostat is most likely stuck open and needs replaced. If it is hot we know you have circulation. The cap on the expansion tank may be defective, if it can't hold the pressure of the water, it will release at the overflow cap if the cap is bad. Also check the coolant level.

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My 1999 cadillac deville keep running hot, i have replace raditor, this car still running hot

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