Join Date: Oct 2007
Location: Dayton, Oh and St. Louis, Mo.
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Black bottle is for washer fluid. The other one is a home grown shade tree engineered catch tank. If the radiator is full leave it alone, it has plenty. Originally there was no catch tank and a couple inches below the radiator cap would have been normal level for coolant. As for the thermostat housing. It could have pits from corrosion and not sealing well against the hose. It could be the hose or the clamp. If you replace any of it I would replace the thermostat and the gasket plus what ever is wrong. No sense in doing things twice.
66 GTO 4bbl power windows A/C auto
67 GTO H.O. Convert 4spd