It sounds like you have an intake gasket leak. Go to a local parts store and tell them you want to pressure test the cooling sustem. Most will lend or rent the tool to you. Pressurize it (WHEN IT IS COLD) and see if you can find any leaks.
As far as the housing at the end of the upper hose, it is the thermostat housing.
Let me know what you find.
Friday, February 19th, 2010 AT 11:55 PM