Question about 2002 Oldsmobile Silhouette

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I have a serious overheating issue. As the vehicle idles the temp starts to rise if you bring up the revs the temp will fall a bit. As your driving it rises at every stop light or traffic line up. We changed the thermo stat and believed we had an air lock we flushed and flushed it and it ran at an even temp for about 12 miles. then immediatly redlined the temp gauge. I shut the engine off and released some of the pressure by turning the rad cap part way. The rad resevoir started spuing out green foam like a shook up soda.the temp then dropped again to normal and I drove about 2 miles and the temp redlined again. Now the waterpump is hot hot hot and the rad it very cold to the touch . the fluid in the resevoire is cold to the touch. There is no antifreeze in the oil nor comimg out the exhuast. We believe it could be the water pump but could it be a cracked or head gasket?

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With what you describe the problem to be I would have the radiator flow checked. Sounds like it may be clogged if not the pump is probably bad. The head gasket should be o-kay due to no loss of fluid or smoke out the tailpipe. Do theses checks and you should find your problem.

Posted on Oct 01, 2009

It is possible that the impeller on the water pump is loose and not pumping. Also don't rule out head gasket leaking and not to the point where you are starting to get coolant back into the oil. Sounds iffiy, but you need to think this out before you tear it apart. Vehicles not real old for a blockage ,but do not assume anything. If your rad cap is on the radiator and a lot are not,take it off and run it and watch for flow and also air bubbles, as in pressure from a cylinder with a bad gasket.

Posted on Oct 01, 2009

  • Anonymous Oct 01, 2009

    Two bad thermostats is a stretch ,but never know. Put the new one in a pot on the stove with a thermeter and see if it opens at 196 degrees

  • Anonymous Oct 01, 2009

    Water in the pot

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