Question about 2000 Oldsmobile Silhouette

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Changing thermastat where is it and is it hard to change?

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The thermostat is under the throttle body from the top hose. it requires much patience and tiny fingers to get at the bottom bolt. sometimes a 1/4 swivel will work. or take the throttle body off. but will have to replace throttle body gasket.

Posted on Jan 26, 2009

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Thermastat and water pump changed but still overheating. why?


Could be a few things. Blockage in the radiator, blown headgasket, bad fan. Need to check for those or get a shop to have a look.

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I have a 1999 Pontiac Grand Am GT that keeps Overheating. I've changed the Water pump, Radiator, Rehotwired the fans to alway come on right when I start the car and only go off when I kill it. It


With a over heating problem the first place you always check is the thermastat.Thermastats ALWAYS go.
In fact every two years I change the thermastat wether or not it needs it just to be safe than sorry,I live in a snow belt and nothing worst than having no heat in the winter.
Something else you might keep in mind, over heating can do allot of damage most people don't consider, the transmission lines are connected to the radiator which cool the transmission

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when changing the thermastat was there oil there also? Sounds like you have a blown head gasket, sorry

Oct 27, 2012 | 1999 Oldsmobile Intrigue

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How to change a thermastat


let the engine cool off then slowley remove the radiator cap find the drain for the radiator (bottom), drain the cooolant into a container and dispose of properly no contamination this way. follow the upper radiator hose to the thermastate housing carfully remove the bolts from the housing. if the housing dont lift off tap lightly with a screwdriver handle (not too hard could break), lift housing off and find thermastat notice the position from top and bottom of thermostat replace and refill coolant. run engine for a bit watching the temp gauge till engine warms up the check antifreeze level add if needed.

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Two things I can think of offhand you might check or change. The thermastat may need changed or the radiator needs service or changed.

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Engine light came...code says thermastat...engine runs cooler then normal...just change out thermastat??? Cap for last several months has been really hard to get off...I live in phx and its been really...


Yes, change out the thermostat. It's probably stuck all the way open because in Arizona it rarely gets cold enough for it to need to close down allowing the engine to warm up. It's easy to do. Try this link for instructions.

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1997 a4 se overheating.i have changed the thermostat and car is still overheating.cold air is coming from the blower.car drives perfectly otherwise.fan is not coming on.how would i diagnose the problem


Alot of time you have to bleed the cooling system after changing a thermostat it gets an air pocket in it look for a bleeder valve near or on the thermastat housing if so bleed it to get the air out.check the radiator and make sure its full because if you filled it up after changing the thermastat once the thermastat opened after the engine ran awhile well the cooling system needs refilled.

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My 1999 eldorado overheats, nothing is leaking, coolant has not been changed until now, could sludge be cloging thermastat, should i change it? I changed radiator cap, Could air pockets cause overheating?


If you aren't loosing any antifreeze, you might check to see if the coolant fan on the radiator is coming on. If the thermastat is sticking your radiator hose will be solid to even swellen sometimes. Of course not to mention that if a radiator is over 5 years old, it could be bad, so you may need some things checked futher.

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