The 3.7 has an internal water pump. ....
I meant to mention what the comment was about.
When I had an oil change they said that the degas bottle was “almost empty” and that there were no external leaks.
Shortly after I had enough down time to get it into a dealer at home and they determined it was holding pressure with a cooling system pressure test. They state (and alldata agrees) that it is a conventional water pump on this vehicle.
I’ll try to have a look at the crossover tube..