Leak from hose under radiator

[New2fixing]

Thanks in advance for any help or suggestions on this.

I have a 2001 Explorer Sport Trac 4X4

So a couple of weeks ago I noticed my temp gauge not working. Wasn't able to get a new coolant sensor till this week when I swapped out the sensor and thermostat. But between then and now a leak from the radiator developed. From what I can tell it's coming from a small hose all the way on the left towards the passenger side.

What hose is it and what's the issue? Is it loose? Does it need replacing. I'll attempt to attach a pic.

Thanks again! You guys are awesome! View attachment 170345

 

[donalds]

Looks like your transmission cooler line but I may be wrong
No big deal tighten up the clamp
If that don't work replacement of the hose and clamp is In order

 

[New2fixing]

Thanks! I'll keep that in mind. I really appreciate it.