Look in front of the engine with some light !
I took this pic when I first got the JKU, in case I'd have to change the serpentine belt-
Check the thermostat housing for leaks, cause it can leak in one spot then follow the pan/block surface and it may look like it's coming out of a point-when it actually isn't !!
If you can't find any traces of antifreeze on your eng. dipstick and the engine runs OK/cool, the leak is probably external
Remember, gravity makes all leaks gather at THE LOWEST POINTS and those aren't necessarily the leak !
Yea, I don't know why I even mentioned the coolant lines--there ain't none !