Question about 1999 Oldsmobile Silhouette

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My Olds Silhoute is overheating...

I have replaced the thermostat and the water pump, but it still is overheating and backflows into the resevoire tank. The radiator is cool the touch, help!

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  • graves_bless Jan 03, 2009

    Belt is on correctly

  • dna_jbi Jan 07, 2009

    I have the same problem my olsmobile is overheating, we replace the thermostate, water, pump radiador, and still the same . if somebody knows how to fix this problem please let us know thank you and god bless you.

  • dna_jbi Jan 10, 2009

    We done that to we bleed the system and is seems to be fine but after 15 mint Drive it overheat again, and then I have to get all the air out of the system again. we know air is going in the system but we don't know from were. Thank you let me now any updates.

  • cahcah2 Jan 10, 2009

    the air does seem to be the problem, where it is comeing from is a mystery., lol I spent probally about 3hrs or so bleeding mine off. I made the mistake of letting the resivior get to low so I guess more air got in that way but after I finaly got done with it it seems to be fine now. It's not really a just open up and let some air out kinda of thing, you have to pretty much play with it and force all the air out. darndest thing I have ever come across. I suppose the next step if your sure all the air is out and it still overheats is to do a vacumm check to find where air is getting in.

  • graves_bless Jan 11, 2009

    We have tried bleeding the air out of our system several times, and sometimes it takes hours to overheat again, but it still overheats. Yes, I too wonder where the pressure is coming from. The belt is on correctly...



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I must say it is a curious problem, we recently got a used 2001 and have just had the same problem. The way it was heating up I felt it was the thermostat so changed that but didnt help. It appears that air pockets are causeing the over heating. On the thermostat houseing is a bleeder vaule which you can use to get the air out. It takes a little time to get all the air out but once I bleed the system out it seems to be fine now. Hope this helps

Posted on Jan 09, 2009

  • Matt Dorland
    Matt Dorland May 27, 2014

    I will give it a try. FYI it is not overflowing into resevoir take


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Blown headgasket 100% Sorry guys just had the problem

Posted on Nov 17, 2009

  • masterase Nov 17, 2009

    If the belt was routed wrong it would overheat all the time.


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I know this may sound silly,but is the serp.belt routed correctly,if belt is on wrong side of pulley the pump will turn backwards and not flow the coolant.

Posted on Jan 03, 2009

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If the car is overheating it could be due to a thermostat which is stuck in the closed position, a failed water pump or just a slack belt driving it. I think there will be a "little" tube carrying coolant from the engine to the coolant expansion tank, and if you run the engine with the filler cap removed you should see water coming through that pipe IF the rump is running. A failed water pump will not necessarily leak, it just won't pump the water round the engine.

Always take care when dealing with a pressurised cooling system on an overheating engine - the water may well be above boiling point.

If you run the engine without coolant the cylinder head may well warp and repair bill will be huge.

Hope this helps you a bit. D

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