Thermostat replacement

1999 MITSUBISHI ECLIPSE
140,000 MILES • 2.0L • 4 CYL • 2WD • AUTOMATIC
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NIKKI PHILLIPS
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  • 1 POST
I'm trying to replace my thermostat and housing but the seal that came on the thermostat will not sit in housing I don't know what to do.
Aug 30, 2019 at 8:13 AM
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KASEKENNY
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  • 18,907 POSTS
Hi Nikki,

This is not uncommon for the gaskets that they provide to not fit quite right.

You have a couple options. Parts stores sell sheets of gasket material and you can make your own gasket. Or you can just get a silicone sealant which will probably be the best option and is what I usually use instead of the gasket. Just make sure you get one that is meant for coolant. Attached is a picture of a common one.

You just put a bead of this on the perimeter of the sealing surface and then install it and let it dry.

Let me know if you have questions.
Aug 30, 2019 at 1:11 PM