Is there something supposed to be connected at the end of that tube? I did the PHH a while back but I cant remember. I’m not losing coolant or anything. Thank you
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No, it's a blind end capped and soldered shut.
For the models with a rear heater there are two short side pipes; the pipe/hose for the front heater is the equivalent of 5/8" ID and the side pipe/hose for the rear heater hose is 1/2" ID.
Can't tell from the photo but there is a leak, more likely from a hose.
You could clean off the crust/crud and watch it closely (take better photos close up) to see where the leak is coming from.