Question about 1998 Chevrolet Lumina

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Replacing thermostat on 3100 sfi v6

What is involved in replacing thermostat on 3100 sfi v6 1989 lumina?

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  • demottjd2010 May 11, 2010

    need to know what the engine displacement is? 3.1, 3.3, or 3.8. those are all v6 engines for your car

  • steve foster Oct 28, 2012


  • Anonymous Mar 18, 2014

    Where does the fuel injection wiring harness plug into on a 99 Malibu 3100 SFI



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1. drain coolant from radiator
2. unbolt and remove the water neck from the engine block (it's attached to the upper radiator hose) and scrape any leftover gasket material off of the mating surface w/ a razor or gasket scraper, being careful not to actually gouge the metal
3. pull thermostat out of engine block (it's easy to see w/ the water neck off)
4. scrape any gasket material off mating surface on engine side, being even more careful not to gouge the metal here
5. place new t-stat on engine side opening
6. place gasket over the thermostat (you can put a thin bead of RTV sealant on both sides of the gasket if you wish, some people think it's overkill, but i hate doing things twice)
7. replace water neck
8. refill cooling system, use the little brass bleeder screw on top of the motor to bleed out the air until a steady stream of coolant is coming out after the engine is warmed up. close the screw.

Posted on Sep 29, 2009


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