"C" thermostat gasket - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 12-21-2004, 04:58 PM   #1
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Default "C" thermostat gasket

Anyone know if you can use a FelPro 35485 gasket to seal the thermostat in a "C" 3800 ? The original GM part seems to be unobtainable. This goes on the thermostat itself and is not the O'ring (FelPro 00427).

And what is a 12337901 ? ACDelco says to use it in place of both the O'ring and the gasket.
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Old 12-21-2004, 07:59 PM   #2
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Are you talking about the rubber piece that mates up with the tstat and the tstat housing? I don't know about needing one. I don't have one [but I have the o-ring that the tstat housing and intake mate up with]. I haven't encountered any leaks. Is your'* damaged or missing? Best bet is to take your'* along when purchasing one. Mine was in flawless condition. I know it may sound dumb, but you could probably get one in the junkyard that may be in good condition.


-justin
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Old 12-21-2004, 09:42 PM   #3
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More of a perrenial issue that I am trying to nail down, what are the actual part numbers ?. In Orlando I do not have a problem with not enough heat but there was a TSB on the issue and that is when the second gasket was added.
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Old 12-22-2004, 02:19 AM   #4
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Quote:
Originally Posted by padgett
More of a perrenial issue that I am trying to nail down, what are the actual part numbers ?. In Orlando I do not have a problem with not enough heat but there was a TSB on the issue and that is when the second gasket was added.
Do you have the text or the general idea of the TSB? Sorry for the off topic.
I replaced the thermostat once in my 88 Royale and could NEVER get decent heat from it unless I put cardboard over the radiator in the wintertime.

I recently changed the t-stat in MrsCrzydmnd'* to a 180 and she complains of not enough heat lately too, bad enough that she drives mine instead. I also used only one gasket. I have the Fel-Pro O ring new in the package in the shop, can post it tomorrow and maybe see if its different from yours?
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Old 12-22-2004, 08:37 AM   #5
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Hmm.. you have me curious now, because I never used the heat after my tstat replacement. I think I need to find that gasket. If I can, do you want a pic of it? Or do you know what to look for?


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Old 12-22-2004, 09:18 AM   #6
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Haven't seen the new gasket so a .jpg would be useful. Is a picture on the AC Delco page but just looks like an O'ring. May put together a web page on the subject, it keeps coming up.
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Old 12-22-2004, 12:55 PM   #7
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"could never het enough heat out of my 91... It'll get warm but thats it"

Have seen two things do that. The first is a stuck open thermostat so the coolant never gets warm enough. The second is a stuck hot-cold diverter (most common with ATC - is behind the glove compartment) the coolant reaches normal operating temp (anything over 150F) but the heater doesn't do much. With the second often the A/C is not up to snuff either.
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Old 12-22-2004, 05:00 PM   #8
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the only thing listed is a O-ring and Seal outlet gasket isnt available
Felpro seal PN 35126
Felpro o-ring 35608
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Old 12-22-2004, 06:05 PM   #9
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Might be because there is no gasket on a "C" engine - water seal is with the O'ring and the "seal" may be the part to keep coolant from bypassing the thermostat (goes between the water neck and the thermostat).
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Old 12-22-2004, 10:25 PM   #10
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I have one. I guess I am just special .


-justin
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