Those 3.4's were notorious (ask me how I know) for leaking intake manifold gaskets at the coolant ports. Yes coolant into the engine and bye bye engine. :x The window may have broke loose from the shoe its glued into at the factory. There is a resin epoxy, mix A+B, out there that works on glass (ask me how I know).:x:x
I almost forgot, the 3.4 is also legendary for cracks across the threaded spark plug holes on the aluminum heads.POS