Help with overheating

Hey mechanics. I have an 08 pontiac torrent. It was overheating so I replaced thermostat, water pump, belt and refilled/bled system to get excess air out.

Everything seemed fine, didn't have any issues on daily commute or drives under 15 minutes so I assumed it was all good. I normally don't drive very far.

I had a longer drive this week for family parties. On drive home, temp skyrocketed. Pulled over, killed engine and let it cool. Noticed coolant dripping from somewhere under/behind battery box but can't find actual source without pulling all of that out. It was dripping behind bumper.

Thoughts on what to look at next?