I have a 2014 dodge avenger that is leaking coolant. I took the front bumper off and was able to find the source of the leak (or so I think). It is coming from a screw on the very bottom passenger side of the radiator. It has a small rubber gasket that I can feel. I have looked at diagrams and YouTube videos but I can’t figure out exactly what part this is.

 

There are rubber vibration isolators at the bottom corners. And the petcock drain I believe is just above it on the passenger side. It could be the drain plug leaking or perhaps a small crack or hole in the radiator in that area.