I Understand that once a vechicle gets older things are going to quick, well my water pump quits and I replaced it. Well then my radiator hose busted and that had to be replaced, had to come directly from the dealer because it is a dodge trade mark or somthing like that. I have been about 5 months (luckily) with out any problems. I have noticed that my water was getting low and I had no anti-freeze due to it "leaking" out. The mechanics I took it too did not know where the leak is coming from. If it's leaking there has to be a problem. I love my durango and probably would buy another, but I just don't like all of these problems.
I've notice that you said the water pump was replaced.
I have replaced mine also, I installed it myself and the problem was because I didn't put enough seal so I had anti-freeze leaking for about a day or so. never had a problem since.