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95.5-2004 Tacomas & 96-2002 4Runners 4th gen pickups and 3rd gen 4Runners

What is this? (pic)

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Old 08-11-2018, 05:27 AM
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What is this? (pic)

Ok so yesterday I pulled the old thermostat out and was cleaning the housing and saw this red rubber - ish gasket inside the housing. What is it and what should I do? The other pic is the old TS (top) with the gasket still intact and the new TS on the bottom, which I am returning for a refund and getting an OEM TS b/c they are obviously not the same. I see no leaks or evidence of any problem on the outside of the housing, hoses, etc. Thanks in advance. '99 4Runner Limited 3.4L V6 190k miles
Thanks in advance.





Last edited by flygirl0344; 08-11-2018 at 05:45 AM.
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Old 08-11-2018, 08:31 AM
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I'd say gasket maker for good luck perhaps on a previous install. FSM says clock the jiggle valve to 6, OEM is much better quality. I found corrosion on my T-stat housing flange needed a bit of JB weld to smooth it out for a better seal, so far so good.
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Old 08-11-2018, 09:19 AM
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Sooo, what do I need to do? Have this thing towed to a shop or just put the new TS in and see what happens?
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Old 08-11-2018, 10:27 AM
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I would put the old t-stat & gasket back in, return the non-OEM, and get a OEM replacement like you planned.
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Old 08-12-2018, 10:57 AM
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Originally Posted by Malcolm99 View Post
I'd say gasket maker for good luck perhaps on a previous install.
^^ That is what it looks like to me.

If your thermostat housing is not too corroded, the rubber thermostat gasket should be all that is needed to create a good seal.

If you are going with an OEM thermostat (good choice!) I would also consider replacing the original rubber gasket while you are in there.


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