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Q: Thermostat replacement. Gasket?

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I am replacing the thermostat. I was told there is no gasket replacement to purchase. Do I need to use rtv or will the new thermostat seal things up on its own?

Also, is there any trick to catching the coolant in such a tight space so I don't make a mess?

My car has 280000 miles.
My car has a manual transmission.

Your thermostat should definitely have a gasket sealing the housing when replacing your thermostat. I would suggest having a professional from YourMechanic come to your location to inspect and replace your thermostat.

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