Thread: Thermostat housing sealant?

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  1. #1 Thermostat housing sealant? 
    GT Level Member GTPRiley's Avatar
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    Hey guys I changed my thermostat to a 180 recently and since then I cant get my thermostat housing to seal up and its leaking slightly, what should I do to get it sealed up... Thanks guys!
    Riley Greear
    "Bastardized" 2004 Grand Prix GTP Comp G. 180* Tstat, Fender Well Intake, AL 104's SSAC Headers 3.5 MPS XP-HOT Cam and 105# springs.
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  2. #2 Re: Thermostat housing sealant? 
    GT Level Member beastin1's Avatar
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    Quote Originally Posted by GTPRiley View Post
    Hey guys I changed my thermostat to a 180 recently and since then I cant get my thermostat housing to seal up and its leaking slightly, what should I do to get it sealed up... Thanks guys!
    did you replace the rubber gasket??? otherwise try silicone sealent....hi temp of course

    2002 Galaxy Silver 4dr. GTP...supercharger heaven.
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  3. #3 Re: Thermostat housing sealant? 
    DUI BABY Bio248's Avatar
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    if the rubber gasket is new(er) it should seal just fine.
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  4. #4 Re: Thermostat housing sealant? 
    GT Level Member GTPRiley's Avatar
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    Thats the thing its a brand new gasket, and at first it wouldnt seal at all. I flipped it and it sealed better, can I get a high temp silicone sealant from Lowes?
    Riley Greear
    "Bastardized" 2004 Grand Prix GTP Comp G. 180* Tstat, Fender Well Intake, AL 104's SSAC Headers 3.5 MPS XP-HOT Cam and 105# springs.
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  5. #5 Re: Thermostat housing sealant? 
    GrandPrix Junkie Sabrewings's Avatar
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    Yeah, the gasket is only one way. If you even got it in backwards it may be damaged and that's why it isn't sealing. It's somewhat "bowl" shaped so it will fit down into the LIM and the housing will seal on top of it. This provides the seal so coolant won't get out, and also so that coolant can't get around a closed thermostat.
    2004 Impala LS - got some mods sold!!!
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  6. #6 Re: Thermostat housing sealant? 
    GXP Level Member Iron Indian's Avatar
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    From my experiance with a couple Series 2 3800 and doing coolant flushes yearly i learned something. Over time it seems the rubber seal on the Thermostat which is designed to seal the housing too eventully won't seal good. My solution? Simple, use a LIGHT coat of gray permetex RTV (water pump/t-stat housing) around the housing and it will cure it. And thats with using a new rubber seal too. I always replace the seal everytime too. Don't put RTV on the T-stat seal, just the housing only.

    Good luck...
    Shawn W. Larsen

    2005 Pontiac GTO 6.0 LS2/A4... Stalled/Cam Only: 406 RWHP , 370 RWTQ

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  7. #7 Re: Thermostat housing sealant? 
    GT Level Member GTPRiley's Avatar
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    Alrighty, Ill just get some High heat silicone stuff tomorrow from Lowes or something that should seal it up. I hate the smell of Antifreeze burning, its horrible lol.
    Riley Greear
    "Bastardized" 2004 Grand Prix GTP Comp G. 180* Tstat, Fender Well Intake, AL 104's SSAC Headers 3.5 MPS XP-HOT Cam and 105# springs.
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  8. #8 Re: Thermostat housing sealant? 
    GTP Level Member JoshMcMadMac's Avatar
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    Quote Originally Posted by GTPRiley View Post
    Alrighty, Ill just get some High heat silicone stuff tomorrow from Lowes or something that should seal it up. I hate the smell of Antifreeze burning, its horrible lol.
    Do not go to Lowes for automotive parts. You need to go to the autoparts store and pick up the red RTV. It is designed for seals like that. Use it sparingly and you should be good.
    2000 NavyBlueMetallic GTP Coupe
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  9. #9 Re: Thermostat housing sealant? 
    GT Level Member GTPRiley's Avatar
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    Ok I got it, it should work just fine...
    Riley Greear
    "Bastardized" 2004 Grand Prix GTP Comp G. 180* Tstat, Fender Well Intake, AL 104's SSAC Headers 3.5 MPS XP-HOT Cam and 105# springs.
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  10. #10 Re: Thermostat housing sealant? 
    GT Level Member beastin1's Avatar
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    yea, that RTV is the exact stuff ya need, i just couldn't remember the name yesterday when i posted.... but i've got a tube in the garage right now, too bad you don't live closer....lol

    2002 Galaxy Silver 4dr. GTP...supercharger heaven.
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  11. #11 Re: Thermostat housing sealant? 
    GTP Level Member Smokin2000gtp's Avatar
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    Quote Originally Posted by Iron Indian View Post
    From my experiance with a couple Series 2 3800 and doing coolant flushes yearly i learned something. Over time it seems the rubber seal on the Thermostat which is designed to seal the housing too eventully won't seal good. My solution? Simple, use a LIGHT coat of gray permetex RTV (water pump/t-stat housing) around the housing and it will cure it. And thats with using a new rubber seal too. I always replace the seal everytime too. Don't put RTV on the T-stat seal, just the housing only.

    Good luck...
    That's what I used too, works great.
    2000 Silvermist Grand Prix GTP Coupe

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  12. #12 Re: Thermostat housing sealant? 
    GT Level Member GTPRiley's Avatar
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    Ok I didnt get the Gray but I got the red stuff and its High Temp... Hopefully it will seal up Im sick of it leaking, makes the driveway look horrible and it smells even worse...
    Riley Greear
    "Bastardized" 2004 Grand Prix GTP Comp G. 180* Tstat, Fender Well Intake, AL 104's SSAC Headers 3.5 MPS XP-HOT Cam and 105# springs.
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  13. #13 Re: Thermostat housing sealant? 
    GT Level Member beastin1's Avatar
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    i got the red too...should be just what the doctor ordered, although consider picking up a new gasket first, that way all bases are covered

    2002 Galaxy Silver 4dr. GTP...supercharger heaven.
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  14. #14 Re: Thermostat housing sealant? 
    GTP Level Member Smokin2000gtp's Avatar
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    Nah Straight RTV is fine.
    2000 Silvermist Grand Prix GTP Coupe

    Mods-Custom Thrasher CAI|Ceramic Coated S&S Headers|3.4" pulley|ZZP S4 Blower|Powrtuner|PRJ 10.4mm wires|HIDs|F-Body brakes|Koni's and Voglant's|
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  15. #15 Re: Thermostat housing sealant? 
    GT Level Member GTPRiley's Avatar
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    I got the gasket at the same time as I got the RTV so it should work out lol, I swear if this doesnt stop leaking lol
    Riley Greear
    "Bastardized" 2004 Grand Prix GTP Comp G. 180* Tstat, Fender Well Intake, AL 104's SSAC Headers 3.5 MPS XP-HOT Cam and 105# springs.
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  16. #16 Re: Thermostat housing sealant? 
    GT Level Member GTPRiley's Avatar
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    ITS FIXED!!! No more leak, No more smell. No more Smoke... RTV is the ****! Thanks everyone for helping me out.... WHOO!!!
    Riley Greear
    "Bastardized" 2004 Grand Prix GTP Comp G. 180* Tstat, Fender Well Intake, AL 104's SSAC Headers 3.5 MPS XP-HOT Cam and 105# springs.
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  17. #17 Re: Thermostat housing sealant? 
    GrandPrix Junkie Sabrewings's Avatar
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    I can't believe you guys have trouble getting it to seal. I bet your gasket surfaces are dirty. I wipe it down and scrape the housing side every time I change one out. Did my fourth change today, and still no issues sealing.
    2004 Impala LS - got some mods sold!!!
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  18. #18 Re: Thermostat housing sealant? 
    GT Level Member GTPRiley's Avatar
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    Sabre what all is done to that Impala eh eh??? C'mon tell me lol.
    Riley Greear
    "Bastardized" 2004 Grand Prix GTP Comp G. 180* Tstat, Fender Well Intake, AL 104's SSAC Headers 3.5 MPS XP-HOT Cam and 105# springs.
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  19. #19 Re: Thermostat housing sealant? 
    GT Level Member beastin1's Avatar
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    congrats on the fix Riley

    2002 Galaxy Silver 4dr. GTP...supercharger heaven.
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  20. #20 Re: Thermostat housing sealant? 
    GrandPrix Junkie Sabrewings's Avatar
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    Quote Originally Posted by GTPRiley View Post
    Sabre what all is done to that Impala eh eh??? C'mon tell me lol.
    North American Impala Owners Association - Garage - Sabrewings's 2004 Chevrolet Impala
    2004 Impala LS - got some mods sold!!!
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