I'm not really sure what a hot diesel would smell like. I don't smell anything unusual.

I'm wondering at this point if I may need a new water pump? When I open the cap I don't see any movement of fluid. I would think I should see the fluid movement?

I also have a new problem. Since I replaced the tensioner I am throwing my belt. The old tensioner had a lip on each side of the pulley. The new tensioner pulley is flat. When I rev the engine now the belt will slip off the tensioner pulley.