Nice man, do you have a pic without the covers on?
These connectors have worked very well for me if you are interested:
https://www.amazon.com/gp/product/B07JJ6YYKL/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Could be a Tee fitting at the heater core connection ready to jump the shark on you. Or a slow weep on the radiator tank. Small enough not to drip on the ground but enough to get a whiff.
I'd be surprised if that would fit the low side on the 07-14's. I know it's tight as hell back there I can barely get the gauges hose connected in there. Neat tool though.
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