Question about 1998 Chevrolet Lumina

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Themostat replace 3100 engine

Size of two bolts on thermostat housing?

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  • charlesmrkt2 Dec 07, 2008

    thank you emmissionwiz - as one said the first bolt is difficult

    the second one is harder .... thank you for the help with this


  • Anonymous Mar 14, 2014

    I need to replace my themostat and also need a location



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Posted on Dec 07, 2008

  • yadayada
    yadayada Dec 07, 2008

    You're welcome, my car uses this same engine, hope the darn thing does'nt fail.



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Water in KIA Carnival (Australia) keeps overheating and building up pressure in overflow bottle, then squirting out. Could this be Thermostat problems? If so where in engine is it situated and how hard is...

G'day Noel,
Yes it could be the themostat. It is located inside a little housing at the top front of the engine. Replacement is straight forward. Remove any cowls or covers obstructing your view of the top radiator hose where it attaches to the engine. Drain the coolant from the system by undoing the bottom radiator hose. You may want to catch this fluid for later use. Remove the top radiator hose. Undo the three bolts holding the thermostat housing and gently tap if free with a screwdriver handle. Clean and inspect the housing for corrosion damage. Fit new themostat and refit the housing using a new gasket. Note: make sure you put the themostat back the same way it came out. Tighten housing bolts, replace radiator top and bottom hoses and fill with coolant. Do not fit radiator cap at this point. Start and run engine until you feel hot water arrive in the top of the radiator and all air has been dispelled. Shut off the engine and top up the radiator coolant. Do this again after it has cooled down and before attempting any long trips check it again. Do not open the radiator cap when the engine is hot. Also have a read of this article...

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How to replace themostat

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  2. Use a sealable container and reuse the coolant if it is relatively new and clean.
  3. Follow the upper radiator hose to the point where it meets the thermostat housing. The thermosat is located inside the housing.
  4. Use a clamp tool or vise-grip pliers to loosen the clamp holding the hose to the housing. Work the end of the radiator hose free of the thermostat housing.
  5. Remove two bolts holding on the thermostat housing cover. Pull off the cover.
  6. Take note of the position of the old thermostat. Remove and install the new thermostat in exactly the same position.
  7. Scrape off residue of the old thermostat gasket from the inside of the thermostat housing cover using a razor blade. Avoid getting any debris inside the thermostat housing.
  8. Install the new gasket. Reattach the thermostat housing cover and radiator hose. Start your Jeep and run the heater on high. Allow the engine to warm up. Check for leaks.

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