Question about 1999 Oldsmobile Silhouette

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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.

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  • Anonymous Jan 22, 2009

    1998 Olds Silhouette 94,000 miles--temperature gauge fluctuates between cold and very hot (temperature hot light comes on) and then will go back to normal and light goes off. The engine is not hot as this happens in just a couple of miles. Just had radiator flushed and replaced the thermostat. We had a slow leak in the radiator and used the GM tablets that stops the leak. Every since used the tablets have had trouble with the heat gauge.

    Does anyone have any ideas what it could be?

  • Jamie820 Feb 12, 2009

    Same problem 1998 Silhouette. Slow leak for several months, then water pump shaft leaked. Replaced pump, and had system flushed and new antifreeze. Found another small leak in top radiator hose. Repaired. No more leaks, but heat gauge began to go from cold to hot in a few seconds and there is no heat in the heater. Usually, but not always, it does it at low RPM. Usually, but not always, rev the engine to about 3000 and the temp would come back down and the heater works. I have determined that the water pump is getting air in it, but I have bled air repeatedly and there always seems to be more. Overflow tank is kept plenty full. New pump impeller is formed metal, and old one was cast. Could the original be more tolerant of air in the coolant? Just a wild idea.

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I've ha the same problem replacin water pump sensors flushed it using PRESTONE SUPER FLUSH and replaced the dexcool fans work
After talkin to AUTOZONE they said check all ur lines for eact temp after been ran o idling come to find out my back heater core has a blocked line or isn't working gettin ready to bleed the PAIN IN THE REAR and see if I have to replace the 105$ part yay wish us luck!

Posted on Jan 31, 2013

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The original water pump never had this problem but it's seal failed, but after replacing it with the "new style" pump it began acting up. All symptoms indicated that the pump was not working, expecially at low RPM. It was whipping air instead of pumping water. I have now replaced it (again) with the original style pump (a rebuilt) and the problem is gone. Meanwhile, because of the repeated overheating (lack of water circulation) my motor began to tac, tac, tac loudly. A think it is a valve lifter that had its oil fried or spring annealed. I wish it were something simpler. I still can't use the car.
Original pump is cast, with 9 vanes on a plate. New style is a six bladed fan made of pressed steel with no backing plate. It is more like a blender than a pump. It was sold to me as a proper replacement (new) and is stocked by more than one parts house.
I notice that other people with this problem have also changed their water pump. Did they also use the "new style"?

Posted on Feb 19, 2009

  • Jamie820 Mar 20, 2009

    03/20/09 follow-up. After changing my water pump back to the original style impeller, we drove the van on a 120 mile trip without the temperature gauge going above normal. As we were arriving home, we slowed down to turn off the highway, and it suddenly overheated again. On FIXYA I looked up "air in the coolant" and someone suggested that it might not be air, but exhaust, seeping through a head gasket. I added 24 oz of BAR’S LEAKS BLOCK SEAL, HEAD GASKET FIX, ONE STEP according to directions, and there is no more "air" in the system. We have driven it several 12 mile trips, and let it idle for extended periods, without any heating problems. The BAR’S LEAK appears to have copper chips and filings in a thick syrup or water-glass – maybe $3 of materials and packaging, but it costs about $32.

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I have a 2001 premiere and i replaced everything u guys did and come to find out it was the lower intake so i replaced the lower intake gaskets and my overheating problem was over .

Posted on Feb 17, 2009

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I have have the same problem with my 1999 Oldsmobile Silhouette. I solved the problem by adding more coolant. It has a slow leak some where that I have not been able to find. When the coolant gets low the temp. gauge heats up very quickly but then goes down quickly when you rev the engine. Adding coolant to the reservoir has fixed the problem until it gets low again.

Posted on Feb 10, 2009

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