Question about 1990 Buick LeSabre

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How do I replace the thermostat in my 1990 buick LeSabre?

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  • matcutter Dec 11, 2008

    1990 Buick Century LE: I know where the thermostst housing is located but there are so many things in the way, what do I remove to get at the bolts, The car has power everything and air?

  • matcutter May 11, 2010

    This car has power everything. I can see the thermostat housing but it looks like I have to take apart half of the engine to to get at the bolts!!!!!!!!!!!!!!!!of the thermostat housing. What do I remove to get at this. The first answer you gave was way too vague .

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  • 51 Answers

Hello thank you for using FixYa.com for your answer my name is David .
This should help you out if you have any other questions please let me know.

  • Drain some coolant into a clean container until the coolant level is below the thermostat housing.
  • Remove the upper radiator hose connection from the thermostat housing.
  • Loosen the housing bolts and remove the housing.
  • Remove the gasket and scrape it carefully from the surface of the housing and the mounting surface on the engine. If the gasket remains on either of the surfaces, there will probably bea coolant leak after reassembly. Some engines use a rubber O-ring to seal a thermostat housing.
  • Compare the size of the thermostat to the old one. They are of different sizes, types, and temperature ratings.
  • The temperature rating is stamped on the sensing bulb on the bottom of the thermostat. The temperature bulb faces the block.
  • When replacing a thermostat, be sure that the thermostat fits into the groove in the block or outlet housing. If the thermostat is installed upside down, the engine will overheat.
  • Install the gasket.
  • Reinstall the thermostat housing. Refill the system and run the engine or pressure test to check for leaks.
  • When the engine has reached operating temperature make sure the thermostat opens.
  • You should be able to see coolant circulating within the radiator.
  • Another way of checking thermostat operation is to feel the top of the radiator hose or use a thermometer or multimeter with a temperature probe to confirm that the coolant is warming up.
  • If the engine is overheating, but the top hose is still cool to the touch, the thermostat is stuck closed and must be replaced.

Posted on Nov 08, 2008

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SOURCE: My 1990 Buick Lesabre heater does not work all

Most likely the thermostat sticking...
The thermostat could also be missing!
That would create some of the symptom you describe.

Not too hard to replace. It is at the end of the large radiator hose where it connects to the engine.
1. Drain radiator
2. Undo the two bolts that hold down the thermostat housing
3. remove thermostat and remove all old gasket and gasket sealant residue on the engine and housing
4. replace thermostat in the correct orientation (pointy side UP) with the new gasket and sealant
5. Tighten down housing and re-fill the radiator.


It could also be a clogged heater core. It may only be circulating enough heated water to work sometimes and the water is returning to the radiator via the "bypass" hone.


Hope this helps!

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SOURCE: How do I replace the thermostat on my 2000 Buick

find where the upper radiator hose goes into the engine. the thermostat lives under that cover. drain some coolant from your COLD engine(to avoid burns) remove the bolts and replace the thermostat. be sure to also purchase a new gasket. some 3.8 s use both a rubber and paper gasket. parts store should have listings. reinstall, refill coolant, and run engine, topping off coolant as engine warms. some have small bleeder screw on the thermostat housing to air in bleeding air while filling. just crack it open until steady steam of coolant comes out. test drive and recheck coolant level. recheck coolant and adjust level for the first few days.

Posted on Dec 21, 2010

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