Stop at auto parts store and pick up the prestone 7 hour flush bottle and a back flush kit.
Go home, drain the coolant out into a 3 or so gallon jugs. Refill the system with the bottle of flush and tap water. Burp it and then do the 7 hour drive.
While out driving go pick up two gallons of mopar coolant and two gallons of distilled water from the grocery store. Good time to pickup a new pressure cap and mopar thermostat w/gasket. Consider a full set of Mopar/jeep hoses too and clamps.
Go home, let it cool off and install the back flush kit. Then drain it again.
Back flush the system per the instructions.
Replace all the hoses, make sure the bottom hose has the anti-collapsing spring in it, if you got it from the dealer it wll, if you bought it aftermarket it most likely will not.
Replace the thermostat. Take note of the original one and how it faces, put the little drain hole thats in the flange at the 12 O'clock position.
Remove the overlfow bottle and clean it out then reinstall.
Refill the system, dump in one gallon of mopar coolant and one gallon of distilled water
directly into the radiator.
Use the empty mopar coolant bottle, dump in half of the remaining gallon of distilled water then add a half gallon of the full coolant, dump the remaining half gallon of distilled water into the now half empty mopar coolant. You now have two 50/50 mix gallons of coolant.
Fill the overflow bottle to the hot mark with some of the 50/50 mix.
Fire the engine up and start topping off the radiator, once it is topped off and there are no more fizzy airbubbles visible put the cap on.
Oh, every time you pour in new coolant the thermostat will close, be patient, it will open again.
Put the new cap on
done