Question about 2000 Oldsmobile Silhouette

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Rapidly rising temperature in 2000 Olds Silhouette

The temperature is 70 here and my temperature gauge is showing overheating. The radiator is cool to the touch. Any help????

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  • geminigirl05 Dec 18, 2008

    I have a 2000 Oldsmobile Silhouette, and the temperature gauge gets hot, and the red warning light starts flashing stating that the Coolant is hot. There is not smoke or fluids leaking from the van. I turn the heater on to get rid of any heat and it blows cold air, which is weird. When the temp gets too hot, the van begins to shake. Does anyone have any suggestions to what it could be?

  • swedeheart82 Jan 21, 2009

    I also have a 2000 Oldsmobile Silhouette that overheats when I stop or drive at a slower speed. The heat also stops working and blows out cold air. When I drive at a faster speed, the engine temp goes down and the heat works again. I checked the coolant level and it's where it should be.

    The thermostat was already replaced. Does anyone else think that this may be the water pump?

  • ggreen614 Mar 30, 2009

    Have replaced the water pump, thermostat and radiator cap. Still overheats. What else could it be. ggreen

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Could easliy be your water pump. The coolant in the radiator isn't being forced through the engine by the water pump causing the coolant to be cool and motor overheating. A thermostat can also cause this problem, but I belive it's the water pump.

Posted on Oct 07, 2008

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2 Answers

Over heating


When your temperature gauge reaches "H' it may too late to prevent a major breakdown. Knowing the symptoms of an overheated car and how they occur may be the difference between being inconvenienced and incapacitated.
Identification:---Other than a low oil level or low oil pressure light, there is not a more significant part of a car's instrumentation than a rising temperature gauge or a glowing "Hot" light. These lights are really the only confirmation a driver has that his car is really overheating. It is the identification of the symptoms of an overheating car that enable the motorist to avert a badly damaged engine. Overheating is always a traumatic event for a car's engine, which makes the early identification of the symptom an important addition to the informed motorist's tool kit.
Stuck Thermostat:--The car's thermostat is a valve that controls coolant flow from the engine block to the radiator. When the engine is cold the thermostat remains closed so that the coolant can reach operating temperature quicker and also provide heat to the passenger's compartment. The thermostat has a spring on it that moves depending on coolant temperature causing the thermostat to open. Sometimes the thermostat fails to open thus restricting coolant flow to the radiator where it would be cooled down. This condition is often the cause of overheating. The symptoms of this cause would be a rising temperature gauge and possibly the loss of heat inside the car.
Restricted Radiator:---A car's radiator will have thousands of gallons of coolant passing through in its lifetime. Along with the coolant comes particulate matter in the form of corrosion breaking loose from various parts of the car's cooling system. These contaminates collect in the tubes of the radiator reducing its efficiency. Extensive "plugging" in the radiator will cause the car to overheat. The symptom of this condition would be a rising temperature gauge which goes up when you accelerate.
Coolant Loss:--A car's cooling system is a closed loop system. You are not supposed to lose coolant. Sufficient coolant loss will cause the engine to run hot because engine is heating less coolant to higher temperatures. The symptom of overheating induced by coolant loss would be a pool of coolant on the pavement when the leak is external. Steam under the hood as the lost coolant hits hot parts of the engine, or a rising temperature gauge in the case of a undetectable engine related leak. Of course, the gauge would also go up if the leaks were not detected. Deteriorated Water Pump:--Cars use a belt driven pump to push the water and coolant mixture through the cooling system. This part is called the water pump. Rarely the impeller that draws the coolant through the pump will rust away making it impossible to push any through the system. If this occurs the temperature gauge will climb and coolant will boil over in the radiator. Inoperable Fan:----Most cooling fans are electrically driven. Some are driven by fan belts. If a belt breaks or the electric supply to the fan is interrupted overheating may result. Electric fans are tuned on thermostatically when needed. When the car runs at idle for extended periods or the weather is extremely hot, a failed fan will cause overheating otherwise it serves as a standby assist to the rest of the cooling system. In stress conditions an inoperable fan will cause the temperature gauge to rise. This will help. Thanks please keep updated.please please do rate the solution positively .thank you for using fixya

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1 Answer

Temperature rises rapidly, but radiator is cool to touch


Classic sign of a failed thermostat; it is not opening as it should when reaching its design point of 160-180 degrees F so very little is passing through a tiny hole to the radiator, leaving it cold to the touch. If you remember the good ol' days, the temperature gauge would rise to a perdictable point and pretty much stay there regardless of ambient temps. They can fail open too; then the engine never completely warms up and the gauge then wanders and your gas mileage tanks.  
Just replaced one that didn't play fair since its failure was semi-random; sometimes it worked, sometimes not.   Your thermostat is being kind; it's stuck and this condition is crystal clear. 

Oct 07, 2008 | 2000 Oldsmobile Silhouette

1 Answer

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Perhaps if you could provide a little more information or observations, it might be easier to isolate the problem. For example, it appears you may have a problem with the engine overheating and then your engine dies when the extreme temperature is reached. When you start the engine, watch the temperature gage on the instrument panel. Does the temperature rise slowly (lets say over a period of 10 minutes or more) or does it rise quickly to the point of overheating (less than 5 minutes)? If the temperature rises slowly, it is probably just that the thermostat needs to be replaced. The thermostat is usually located in a housing where the upper radiator hose connects to the engine. If however, the temperature rises rapidly, that indicates a more serious problem. Your engine may have a blown head gasket which is venting hot exhaust gases into the cooling system causing the temperature to rise rapidly. I recently had this exact problem with my Chevrolet Venture which, like your Buick, is a GM product.
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