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PostPosted: Sun Oct 29, 2017 5:53 pm 
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GXP Member
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Joined: Thu Mar 31, 2011 8:57 pm
Posts: 207
Location: Muskego,Wisconsin
Year and Trim: 2000 SLE 2001 SLE 2005 SLE
1975 Monte Carlo
I have a small antifreeze leak coming from under the thermostat housing.
I am going to install a thermostat gasket that I ordered.
I believe there is not one on there now.
Did Pontiac not use a gasket under that housing?
Thank you.


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PostPosted: Sun Oct 29, 2017 8:49 pm 
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Posts like an L67
Posts like an L67

Joined: Sun Aug 22, 2010 11:11 pm
Posts: 1559
Location: Ontario, Canada
Year and Trim: 2000 Bonniville SSEi L67
on my 2000, there is an o-ring in a groove surrounding the thermostat - check to see if yours is in good shape.

https://www.google.ca/search?q=2000+pon ... Ti2ESWRCFM:

you can see both above......wait 2 seconds for the actual pic to load: its from the 'other' site.

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2000 SSEi
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Last edited by 96 SSEi on Mon Oct 30, 2017 9:59 am, edited 1 time in total.

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PostPosted: Sun Oct 29, 2017 8:56 pm 
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Joined: Wed Jun 25, 2014 8:14 pm
Posts: 67
Location: Macedonia, OH
Year and Trim: 2002 SE
There should have been one there (I assume), but if it is leaking from there, then there is not one present. I dealt with the same issue about 3 weeks ago. Make sure you clean the thermostat and the housing surrounding it. It's an easy fix.

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PostPosted: Mon Oct 30, 2017 3:15 pm 
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Location: MN/IA
Year and Trim: '17 Silverado 1500
There isn't a paper gasket between the housing and the intake manifold. There is an o-ring around the thermostat. Make sure both the face of the intake and the face of the housing are clean and flat, and clean them with a scotch-brite if they're not. You shouldn't need a gasket unless something has gotten warped or something.

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PostPosted: Sat Jan 27, 2018 12:41 pm 
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Joined: Sun Jan 21, 2018 1:18 pm
Posts: 52
Location: Alberta, Canada
Year and Trim: 96 Bonneville SSEi
I just changed the thermostat and gasket on my 96. It was a paper gasket that ripped in half when I removed the neck. Half the gasket stayed on the block and the other half stayed on the neck. I scraped it all off, installed the new t-stat with the o-ring properly seated and then used some red gasket maker on the neck and reinstalled the whole thing just to be sure. It has not leaked.

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PostPosted: Sun Jan 28, 2018 12:24 pm 
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Certified Bonneville Nut
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Joined: Mon May 10, 2010 6:11 pm
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Location: Chicago, IL
Year and Trim: 2003 SLE
I added some RTV, even after cleaning the mating surfaces there was a tiny trickle of a leak.

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