Assuming your talking about the upper radiator hose that comes from the thermostat housing to the molded plastic of the raditator, look closely at the top that piece of molded plastic just past the little notch that tells you where to stop the radiator hose. Run your engine, get it hot and look to see if you have a small hair line crack?
I thought I had a hose issue and a mechanic took a look and showed me immediately the small hair line crack. This was just last Saturday on our '02 WJ. Apparently the cracking is common on these radiators. The strategic fix is to replace the radiator. Tactically based on feedback on this forum, was to buy JD Weld and cover the crack to seal it.
Sunday I bought the original JD Weld that handles 500 degree temps, and mixed it up dropped it over the crack, essentially making a pancake shape that cover all the crack and then some. Cured in 24 hrs and is hard as steel. Some on this forum have done this and they say it has lasted 2-3 yrs, others said it started leaking in a couple weeks.
I'm too early into the process to give you feedback, but for $6, it's worth a try. Remember to clean the area with acetone (finger nail polish remover) or alcohol and let dry, prior to the pancake.
2004 Jeep Grand Cherokee Limited 2x4 4.0L
2002 Jeep Grand Cherokee Sport 2x4 4.0L
1998 Jeep Grand Cherokee Laredo 2x4 4.0L
"Three daughters, three Jeeps"