Question about 1993 Buick Century

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Where is the thermostat located on the 1993 Buick Century?

My car is running ok, but when I stop, the water is boiling back into the overflow/fill tank. I figure it is the thermostat, but I don't see where it might be located.

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Follow the top radiator hose backward. On some Century models, you may need to remove the air filter assembly to get at it.

Posted on Jun 19, 2009

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Thermostat will usually give you an almost immediate overheat within a few miles of startup. Check the fan operation before going there.It's also possible that your radiator is partially plugged...slow refilling often indicates that. You should get yourself an inexpensive manual like haynes or chilton it will help you with that and numerous other items the book is about $20.

Posted on Jun 19, 2009

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You did'nt mention what engine you have.
Is the radiator cooling fan running when this occurs?
Make sure there are no obstructions between the A/C condenser and the radiator, it seems to be a favorite place for mice and chipmunks to build nests, and no obstructions in front of the radiator.
Let me know.
Regards,

Posted on Jun 19, 2009

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Posted on Jan 02, 2017

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When refilling coolant, always top up the radiator, and fill the overflow tank to at least the cold mark level (about half-way up on the tank). With cap off, run engine till the thermostat opens- upper radiator hose will become hot-then shut off engine, add coolant to radiator as needed, replace cap. This method of filling will help to expel any trapped air in the system. Oh, and remember to set your heater controls on high when filling coolant, so the heater core and lines also circulate and expel air.
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The car was overheating i checked all hoses and replaced the thermostat the radiator it still is ovrheating and the water is boiling in the overflow tank


Answer could be a faulty thermostat,or it could be a sign that your head gasket is about to blow ,or last of all your timing could be out of sync.

Answer 2 from Inventus: It means your cooling system is funtioning properly. In a system having a coolant recovery tank, coolant in the radiator is always up to the brim, hot or cold. There is negligible or no air space. When coolant in the radiator expands sufficiently due to warming from the engine, it will squeeze past the pressure cap's bottom seal and flow into the recovery tank. (If no provision for such expansion was present, the expansion would rupture the radiator or your hoses.) Only coolant within the radiator is under pressure, and because of this pressure (together with the elevated boiling point that the "anti-freeze" permits), it normally does not boil. But once past the pressure cap's bottom seal, the overflow is at atmospheric pressure and therefore boils.
This boiling is usually unnoticed after a short, i.e., local, trip because the cooler coolant already in the recovery tank quenches it. But after some highway driving the influx of more hot overflow heats up all the coolant in the recovery tank to the (unpressurized, i.e., "natural") boiling point.
As the engine cools when shut off, the contracting coolant in the radiator sucks back coolant from the recovery tank. Fluid in the recovery tank should never be below the "full hot" or "full cold" marks, lest air be sucked in.
-- BETTER ANSWER ==
Your cooling fans are not turning on. It is not normal for your overflow tank to boil like that. It is true that your radiator is overflowing into the reserve tank, but that means yourr adiaotor is boiling. Check for blown fuses or relays for your cooling fans. IF theya re fine. run your engine for about 15 minutes and drive. When you temp level is at normal operating temp open your hood with the engine runing and see if your fans are on. If they are, then you may have a bad thermostat or a plugged radiator, or a bad water pump. If the fans are not on, get your cooling fan switch replaced if your car has one. Check your temp sending sensor

Oct 30, 2011 | Cars & Trucks

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