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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
It's probably the smallest hose above the pump. I'm not too familiar with the 3rd gens under the hood, but I was chasing a leak in my 01 and it was that small hose. It's about 6 inches long and not even an inch in diameter.
Just did my water pump too. Did you clean the gasket surface properly? Thats also directly below the upper hose and thermostat. Id get a mirror and check around there. Pin hole in the hose, bad gasket at the hose flange maybe.