Question about 2002 Buick Century

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I want to inspect the condition of the thermostat of 2002 Buick century, where is it, and what should I look for ?

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Are you having a problem with overheating? Thermostats generally are either good or bad. not much in between. A visual inspection will tell you nothing. Replacement thermostats for this car are relatively cheap (<$15) but to replace it can be quite involved for someone that had not done this. I would suggest you take a drive to your local public library and chcek out a Chilton's or Motor's repair manual for your particular vehicle. BUT.... before doing all this, I have to ask why you think it needs inspection???

Posted on Oct 10, 2010

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For 2002 Buick Century 3.1L SFI OHV 6cyl

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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).

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