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Do I have to pull the manifold to replace thermostat (3.4L) or can I get it in without taking manifold off?

3.4L SFI

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You can get to it without taking manifold off.

Posted on May 08, 2014


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Does anybody have a video link on how to flush the cooling system on a GM 3.1L SFI OHV 6cyl motor? I need a vid for this particular motor cause mine is still overheating & i have looked everywhere.

flushing a cooling system is the same method as any other motor

do it without the thermostat fitted
or water pump opening

sacrifice an old radiator hose to adapt a garden hose fitting
for radiator flush

air in system fix
your thermostat housing has no air bleed valve
no top radiator cap

old school way
heater on full
run motor till thermostats fully open
burp radiator hoses
wait till water is running up into over flow bottle without bubble
replace cap
turn off heater
correct level in over flow bottle

why still over heating
you fitted everything i would have ... yet still overheat
leaking inlet manifold gaskets
hose clamps loose
cooling fans spinning too slow
thermostatic fan switch faulty
aluminum radiator is a big one
air ..fins bent or some water channels blocked

or possible head gasket leak





Nov 02, 2016 | Cars & Trucks

1 Answer

Replace thermostat

You'll love this job!

The thermostat is behind the housing that is bolted to the lower intake manifold that the upper hose is attached to. With a little creativity you can pull this housing without pulling anything else. It does make it a little easier to pull the throttle body so that you have some more room to see and for fingers. you will need a 13mm socket, a swivel, a couple of extensions, maybe a 10mm socket, and a 13mm wrench.

I’m happy to assist further over the phone at

Feb 14, 2012 | 2005 Chevrolet Malibu

1 Answer

How do i replace thermostat ion 1997 grand am 3.1 v6

Hi John: I suggest check this procedure for 1997 Pontiac Grand Am 3.1L SFI OHV 6cyl:

Thermostat removal and installation procedure - 3.1L and 3.3L Engines

Disconnect the negative battery cable.
Drain the cooling system to a level below the thermostat housing.
Remove the air cleaner assembly.
Disconnect the surge tank line from the thermostat housing.
Remove thermostat housing-to-intake manifold attaching bolt and nut, then remove the housing.
Remove the thermostat.

To install:
Clean all gasket surfaces completely.
Insert the thermostat in the intake manifold.
Attach the thermostat housing to the intake manifold.
Install the mounting bolt and nut. Tighten to 18 ft. lbs. (25 Nm) for the 3.1L engine. For the 3.3L engine, tighten to 20 ft. lbs. (27 Nm).
Install the air cleaner assembly.
Connect the surge tank line to thermostat housing.
Refill the cooling system.
Connect the negative battery cable, remove the radiator cap, then start the engine. Allow the engine to run with radiator cap removed, until the upper radiator hose becomes hot (thermostat open). With the engine idling, add coolant to the radiator until the level is up to the bottom of the filler neck.
Install the radiator cap, making sure the arrows line up with the overflow tube.

Hope this helps; also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using Fixya, and have a nice weekend.

Nov 18, 2011 | 1997 Pontiac Grand Am

1 Answer

: 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

1 Answer

Need to replace the themostat

  • Remove the bolts that hold the thermostat housing onto the intake manifold of the MR2 with an adjustable wrench and pull up on the thermostat housing to remove it from the intake. The housing is still connected to the hose. Lift the thermostat housing and the hose up to drain the antifreeze back into the radiator.
  • 2 Remove the old thermostat from the hole inside of the intake manifold and replace it with a new one. Pull the thermostat gasket off of the top of the intake manifold and wipe the manifold clean with a towel.
  • 3 Place a bead of RTV gasket maker around the bottom edge of the thermostat housing and allow it to dry for 15 minutes. Place the thermostat housing back onto the intake manifold and bolt the housing back into place. Allow 15 more minutes of drying time and slightly tighten the bolts again. This will form a solid seal between the intake manifold and the thermostat housing.

  • Dec 23, 2010 | 1991 Toyota MR2

    2 Answers

    Where is the thermostat located

    2000 Buick Century 3.1L SFI OHV 6cyl


    Fig. Unfasten the water outlet attaching bolts, then remove the outlet-3.1L engine shown


    ig. View of the thermostat in its seat in the intake manifold-3.1L engine shown


    Fig. Remove the thermostat from the housing.

    Hope this helps (remember to rate and comment this).

    Oct 01, 2010 | 2000 Buick Century

    1 Answer

    How to replace a thermostat on a 1999 Nissan Quest?

    1999 Nissan/Datsun Truck Quest Mini Van 3.3L SFI 6cyl

    The thermostat is located in the thermostat housing, which is mounted to the coolant crossover tube. The bypass hose is connected to the thermostat water inlet on one end, and to the intake manifold water outlet on the other. The thermostat is not located in the intake manifold water outlet, where the upper radiator hose is connected.


    Fig. Thermostat water inlet sealant application

    Hope helps.

    Sep 13, 2010 | Nissan Quest Cars & Trucks

    2 Answers

    Where is the thermostat located is it inline?


    Fig. 1: View of the thermostat and related components-2.2L engine

    1999 GMC Truck Jimmy 4.3L SFI 6cyl


    Fig. 8: Remove the outlet from the intake manifold


    Fig. 9: Remove the thermostat from the housing

    Hope helps (remember rated this).

    Jun 02, 2010 | 1999 GMC Jimmy

    1 Answer

    Replacing thermostat on 3100 sfi v6

    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.

    Sep 29, 2009 | 1998 Chevrolet Lumina

    1 Answer

    Hose that attaches to back of thermostat housing is leaking

    The hose is a cooling by-pass hose. It makes a big horseshoe and attaches under the front of the intake maniold. I think that if you have small hands and a lot of patience you can likely replace it without haveing to take half the engine apart. (You have to pull the head to pull the intake manifold).
    I think if you remove the battery, and have a small bright light you will be able to see where if attaches under the front of the intake manifold. Advance auto sells the by -pass hose for
    around $12.00 I think.

    Becare if you are probing around there are way too many vaccum lines under the manifold.
    If they come off and you don't know where to put them -- you are in deep kim chee. I know I am
    in super deep Kim chee now.

    Hope this helps

    Nov 21, 2008 | 1990 Isuzu Trooper

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