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Q: Thermostat housing small drip/leaking

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hello my thermostat was broken so I bought a new one and new gasket for it and when I put it in i tightened it all up there's a small drip coming from the thermostat housing I've tried using a gasket sealant getting it even and tight as possible and its still a small drip.

My car has 140000 miles.
My car has an automatic transmission.

The thermostat housing if it is leaking and cannot be sealed will need to be replaced. The plastic may be deformed and cannot seal completely.

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