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.

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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poverty forces one to do unorthodox things

2000 SSEi
past rides:
1996 SSEi
1992 GTP
1987 Grand Am

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 108,539 miles, N/A, SSEi exhaust system, boat roller mount. Gone, but not forgotten.
'13 Buick Regal GS 102k miles, 270 hp, 295 lb/ft, ZZP intake.
(yes, there is a story behind my avatar.)

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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Bye Bye:

RIP sandrock

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 Stage 1 Kit, 3.6" Modular pulley, ZZP ported TB w/spacer, L3 short ram intake w/K&N filter, ZZP Power Log, ZZP DP w/high flow cat & 97+ manifold, ZZP SC coupler, ZZP HV ignition coils w/10.5mm plug wires, 16" Gold crosslaces w/Yokohama Avid tires, Olds LSS T-handle, Sony HU.

2000 Buick LeSabre Custom - Daily - Sony double DIN headunit, ZZP plug wires, ZZP TB spacer, L3 short ram intake - Dark Bronzemist Metallic on taupe

I added some RTV, even after cleaning the mating surfaces there was a tiny trickle of a leak.

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-Car Guy Carl
"Penelope" - 2003 SLE - 247k Miles
"Sydney" - 2000 Honda S2000 - 98k miles