Thread: Changing thermostat on a 2002 Gran Prix 3.1,need info.

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  1. #1 Changing thermostat on a 2002 Gran Prix 3.1,need info. 
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    I'm helping out a friend,trying to save her some money. I am trying to remove the thermostat housing. Is there a way to remove the bottom bolt without dismantling half the upper engine?
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  2. #2 Re: Changing thermostat on a 2002 Gran Prix 3.1,need info. 
    Moderator dsmuts's Avatar
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    The bottom of the thermostat housing is slotted so the bolt only needs loosened.
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  3. #3 Re: Changing thermostat on a 2002 Gran Prix 3.1,need info. 
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    Quote Originally Posted by dsmuts View Post
    The bottom of the thermostat housing is slotted so the bolt only needs loosened.
    Thanks
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  4. #4 Re: Changing thermostat on a 2002 Gran Prix 3.1,need info. 
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    Quote Originally Posted by dsmuts View Post
    The bottom of the thermostat housing is slotted so the bolt only needs loosened.
    What a pain! If you change one of these,just suck it up and remove the mass air flow and throttle assembly. That makes it much easier ti get the housing off. I suspect this design came from an engineer that is related to the creator of the side post battery.
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  5. #5 Re: Changing thermostat on a 2002 Gran Prix 3.1,need info. 
    Moderator dsmuts's Avatar
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    The 3100 is a bad design all around.
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  6. #6 Re: Changing thermostat on a 2002 Gran Prix 3.1,need info. 
    GTX Level Member Steel Armadillo's Avatar
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    The LG8 is a classic example of adapting new technology onto an ancient platform. It's really not that bad, and usually outlasts the tranny it's hooked to.
    The evil LG8 still refuses to die.
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  7. #7 Re: Changing thermostat on a 2002 Gran Prix 3.1,need info. 
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    Take some pics.
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  8. #8 Re: Changing thermostat on a 2002 Gran Prix 3.1,need info. 
    Turbo is the way to go. BillBoost37's Avatar
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    Quote Originally Posted by camopaint0707 View Post
    Take some pics.
    sounds like he's done.

    Yeah it suxks for sure on that engine.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  9. #9 Re: Changing thermostat on a 2002 Gran Prix 3.1,need info. 
    GrandPrix Junkie jteske88's Avatar
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    just did this not that long ago for a friend, i declare once again i hate the 3100 in its entire
    2005 GP GXP-cocor tuned-poly's-lots of sundown
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