Question about 1995 Buick Riviera

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My 1995 Riviera is overheating and this has become a head scratcher (engine 3.8). Last year the radiator, water pump, belts and hoses were replaced. About a week ago it started to overheat. I replaced the intake manifold gasket, supercharger gasket, and thermostat. I still have an overheating problem. I just replaced the coolant level sensor on the radiator, checked the radiator cap it?s about 14 PSI, and checked for a bad head gasket by checking the hoses when fired up and they seem soft until the engine runs for about 15-20 minutes they seem fine. I also checked the coolant and oil when it was changed and both seem fine. The fans are working at both speeds and the heater core seems fine too! The only thing I can think of would be an engine and radiator flush or the coolant temperature sensor. Does anyone have any ideas for this head scratcher?

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    How to replace the timimng belt and what it cost?

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I think you might want to have your cam sensor checked

Posted on Jul 21, 2010

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Drain and flush the cooling system...more than once if needed.
Replace the thermostat with a 180 degree...the OE stat. is 200 degree.
Clean the outside of the radiator and a/c condensor, make sure there is no debris in the cooling fins and they flow air freely.
Fill system with 50/50 mixture.
If it still attempts to overheat...check your cat convertor, it's clogged and creating too much back-pressure
Hope this helps...

Posted on Jul 17, 2010

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Why did my 2011 DTS Cadillac overheat?


An overheated engine can be caused by anything that decreases the cooling system's ability to absorb, transport and dissipate heat; therefore engines can overheat for a variety of reasons. Let's take a look at some of the most common causes.
Cooling System Leaks
This is the primary cause of engine overheating. Possible leak points include hoses, the radiator, water pump, thermostat housing, heater core, head gasket, freeze plugs, automatic transmission oil cooler, cylinder heads and block. Perform a pressure test. A leak-free system should hold pressure for at least one minute.
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Be sure to use the coolant recommended by your vehicle's manufacturer. The wrong type of coolant and/or mixing the incorrect concentration of coolant and distilled water can also result in engine overheating. The best bet is to perform a complete flush and fill.
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A thermostat is a heat-sensitive valve that opens and closes in response to engine temperature. Heated engine coolant passes through to the radiator when the thermostat is in the open position. In the closed position, it prevents the flow of coolant to speed up the warming of a cold engine. When the thermostat gets stuck in the closed position, coolant stays in the engine and quickly becomes overheated, resulting in engine overheating.
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By passing through a series of tubes and fins, coolant temperature is reduced in the radiator. Leaks and clogging are some of the most common causes of radiator failure. Any disruption in the radiator's function can lead to elevated engine temperature and overheating.
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A hose that contains visual cracks or holes, or has burst will result in leaks and disrupt the flow of engine coolant. This can result in overheating.
Bad Radiator Fan
A fan blows air across the radiator fins to assist in reducing the temperature of the coolant. A fan that wobbles, spins freely when the engine is off, or has broken shrouds will not be able to reduce the temperature to proper level, thus possibly resulting in engine overheating.
Loose or Broken Belt
A belt is often the driving link that turns the water pump at the correct speed for proper coolant flow through the cooling system. If a belt is loose or broken, it cannot maintain the proper speed, thus resulting in poor coolant flow and ultimately, engine overheating.
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Known as the 'heart' of the cooling system, the water pump is responsible for pressurizing and propelling engine coolant through the cooling system. Any malfunction of the water pump, including eroded impeller vanes, seepage or wobble in the pump shaft, can prevent adequate coolant flow and result in engine overheating.

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Perhaps you have a lot of burnt belt rubber on the water pump pulley?

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