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PostPosted: Sun Oct 29, 2017 5:53 pm 
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SSEi Member
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Joined: Thu Mar 31, 2011 8:57 pm
Posts: 168
Location: Muskego,Wisconsin
Year and Trim: 2000 SLE & 2001 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: 1371
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
past rides:
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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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SLE Member
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Joined: Wed Jun 25, 2014 8:14 pm
Posts: 52
Location: Kent, 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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'02 Pontiac Bonneville SE 99k miles, naturally aspirated, SSEi exhaust system, survivor of two sunroof leaks and a ruptured fuel rail.


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PostPosted: Mon Oct 30, 2017 3:15 pm 
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Joined: Tue May 27, 2008 10:30 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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SLE Member
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Joined: Sun Jan 21, 2018 1:18 pm
Posts: 36
Location: Alberta, Canada
Year and Trim: 96 Bonneville SSEi
96 Bonneville SE
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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'96 Bonneville SSEi - White on Teal - ZZP L67 Stage 1 Kit, 3.6" Modular Pulley Kit, Tuned PCM, Autolite 104 Plugs, 180 deg T-stat, ZZP SC coupler, High Voltage Ignition Coils, 10.5mm Wires, Short Ram Intake, 16" Gold Crosslaces with Yokohama Avid Envigor Rubber, 6000k LED headlights, 7000k LED Fogs, 6000k Plate LEDs, DRL Delete, Sony Headunit, Alpine Component Speakers.....More go fast and look good to come....

'96 Bonneville SE - Green on Taupe - "The Beater" - L36, K&N drop in filter, 8.5mm wires, '04 Grand Prix sawblade wheels, Sony HU. Over 270,000 reliable KM, it just won't die! Also built 3/96, 9 days after the SSEi


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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
Posts: 8767
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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