I have replaced the thermostat housing gasket 4 times and the damn thing still leaks! Its not a bad leak but still it just pisses me off. I called around to see if i could just buy another thermostat housing but, I have the unique gonzo nose looking one that only the dealership carrys. And im not paying $93 for a new one. This last time I replaced it when I was cleaning out my lower intake manifold. I did it buy the book. I took a fine bristled wire wheel and polished all the gasket surfaces. I applied sealant to both sides gaket. Perfectly aligned the gasket with the housing and torqed both bolts. WTF? Am I not suppose to use sealant?