Originally Posted by Paradise XJ
It's a heater hose. It goes from your t-stat to your heater core. It's easy as buying the hose, removing the clamps, replacing the hose, topping off your coolant.
The hardest part is BUYING the hose. You can buy bulk hose, but easier to use the pre molded hose, it's plug n' play. I'd replace both of them and give the other cooling hoses a good inspection too.
I would go one step further. Given that the hose blew, it did so because it was soft and old. I would be willing to bet that the others are in the same condition. And I would also be willing to bet if they are in that same condition, the coolant has not been flushed/changed in some time.
Assuming all of that is true, and coolant flush/change and replacement of ALL the hoses is a prudent thing to do. The cooling system of the 4.0 XJ is it's Achille's Heel, and keeping it in top shape prevents catastrophic failures and possible engine death.