Question about 1998 Buick Century

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1999 Buick Century thermostat question.

1999 Buick Century thermostat housing is behind the manifold pipe. what is the easiest way to get to the bottom bolt of the thermostat housing.

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Patience , and a 13 MM wrench , you gotta get your arms in there deep , that lower bolt does not need to come all the way off , the thermostat housing has a slot at the bottom for easier access , loosen it about 3.4 of the way and you can get the housing out , experience says a premium thermostat will give you grief trying to reinstall , get a regular duty thermostat .reverse procedure.

Posted on Jan 02, 2009

  • Rick Byrd
    Rick Byrd Jan 03, 2009

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How to replace the thermostat on a 2003 Buick century

Remove the air cleaner duct, the radiator hose the exhaust crossover pipe, the two bolts on the housing remove housing and the thermostat note how thermostat is in replace the same way, install in reverse order and fill with coolant. Let run till bubbles no longer come out then top off coolant.

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Where is the thermostat located in my 1999 buick century 3.1

Follow the upper hose to the motor. Where the hose connects to the motor is where you will find your thermostat.
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Is there a thermotha on this motor

3.1 or 2.2 liter? If its the 3.1 follow the upper hose to the housing bolted to the housing bolted to the lower intake manifold. The thermostat is behind that housing. If its a 2.2 follow the lower hose to the metal housing on the engine. It will be behind that housing. Let me know if you have any questions and I'll do my best to answer them. Thank you for using!

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1999 buick century, location of the freeze plugs on the heads. once the car warms up there is a coolant leak under the thermostat housing and i am not sure where the leak is.

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Feb 16, 2011 | 1999 Buick Century

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: where is the thermostat located on a 2002 buick century custom

For 2002 Buick Century 3.1L SFI OHV 6cyl


Fig. The thermostat on this 3.1L is mounted horizontally and uses an offset housing/water outlet

  1. Disconnect the negative battery cable.
  2. Partially drain the cooling system into a suitable container, to a level below the thermostat.
  3. It is usually possible to leave the radiator hose attached and simply remove the thermostat housing (also called a water outlet) and flex the radiator hose enough to service the thermostat. It is good practice, however, to remove the radiator hose so the thermostat housing can be given a thorough cleaning. Debris on the thermostat housing sealing surface can cause leaks.
  4. Some applications may have electrical connections to sensors which mount in the thermostat housing. Use care when detaching these connectors.
  5. Unfasten the thermostat housing bolts and remove the housing.
  6. Remove the thermostat by simply pulling out. Discard the gasket.
To install:
  1. Clean all parts well. Make sure the sealing surfaces on both the thermostat housing gasket flange and the intake manifold are clean and free of corrosion damage. It is good practice to run a thread cutting tap or a clean bolt into the threaded holes in the manifold to clean out old sealer and dirt. The threads should be clean so the thermostat cover clamps the gasket evenly at assembly.
  2. Position the thermostat in the intake manifold. Make sure it is seated.
  3. Position a new gasket over the thermostat. If no gasket is used, apply a 0.125 in. (3mm) bead of RTV sealer to the thermostat housing and install the housing. Lightly lubricate the bolts with clean engine oil. Torque to 18-20 ft. lbs. (23-27 Nm).
  4. If removed, attach the radiator hose to the thermostat housing.
  5. Refill the engine with the proper mix of DEX-COOL®and water. Connect the negative battery cable, start the engine and check for leaks.

Good luck (remember to rate this answer).

Jan 11, 2011 | 2002 Buick Century

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Where is the temperature sensor located on the 1998 Buick Century?

it is located in the lower intake manifold on the drivers side near the thermostat housing. Follow the upper hose to the thermostat housing (metal pipe). Follow the housing down to the intake manifold. You should see the sensor mounted in that area. It will have a three wire connector.

Sep 30, 2010 | 1998 Buick Century

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Thermostat location on 1990 buick century

Find the thermostat on all vehicles like this:

The engine end of the upper radiator hose goes over a pipe stub, or nipple, and then has a hose clamp tightened around it to hold it on that part. That part is a housing, bolted to the engine, and the thermostat is under that housing.

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the thermostant is behind the exhaust crossover pipe, this is the pipe that connects the front exhaust manifold to the rear, the housing is behind that, its a tight fit,also if you follow the upper radiator hose from the radiator to engine the housing that the hose goes to is where the thermostant goes,heres a diagram, hope this helps,

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Linking out of the thermastat

If the thermostat housing is leaking it could be a bad gasket, a cracked thermostat housing, or a crack in the intake manifold where its bolted on. Cheapest and easiest option would be to get a new gasket and a thin layer of blue permatex.

Feb 28, 2010 | 1998 Buick Century

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Cooling Fans Not Working

It is located behind your thermostat housing. Follow your upper radiator hose to the housing and look between it and the engine. You will see the electrical connection.

Jan 24, 2009 | 1999 Buick Century

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