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Rtv sealant, get a new gasket then cover all mating surfaces of the thermostat housing, and the inlet pipe with rtv sealant. Keep in mind that the sealant will squirt out when you the tighten the bolts so don't put too much on there, just enough that a thin bead of sealant is visible all the way around the thermostat after the bolts have been torqued. Make sure to follow the directions on the package and allow the sealant to cure before you add fluid to the cooling system!

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Q: Your 1999 Oldsmobile Alero thermostat gasket is leaking even after you replaced it how do you fix this?
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