Heater hose coolant return tube

It is probably is the heater hose or the heater return hose.

If there is coolant coming out then YES, try blocking the heater hoses,(disconnect at the engine and loop it back to the other heater hose outlet on the engine) this way you can be sure it is leaking.
To many times removing from the heater hose from the heater core inlets will break the inlet tubes.

it doesnt matter. either way you put them its still only going to go in one tube and out the other!
Hope this helps!
Good Luck

5.2L and 5.9L Engines
See Figure 6

1. Disconnect the negative battery cable.
2. Open the radiator valve and drain the cooling system.
3. Remove the cooling fan and shroud as an assembly.
4. Remove the accessory drive belt.
5. Remove the water pump pulley from the hub.
6. Disconnect the hoses from the water pump.
7. Loosen the heater hose coolant return tube mounting bolt and nut and remove the tube. Discard the O-ring.

Fig. Fig. 6: Water pump mounting bolt locations

1. Remove the water pump mounting bolts.
2. Loosen the clamp at the water pump end of the bypass hose. Slip the bypass hose from the water pump while removing the pump from the engine. Discard the gasket.

To install:

1. Clean all gasket mating surfaces.
2. Guide the water pump and new gasket into position while connecting the bypass hose to the pump. Tighten the water pump bolts to 30 ft. lbs. (40 Nm).
3. Install the bypass hose clamp.
4. Spin the water pump to ensure the pump impeller does not rub against the timing chain cover.
5. Coat a new O-ring with coolant and install it to the heater hose coolant return tube.
6. Install the coolant return tube to the engine. Ensure the slot in the tube bracket is bottomed to the mounting bolt. This will properly position the return tube.
7. Connect the radiator hose to the water pump.
8. Connect the heater hose and clamp to the return tube.
9. Install the water pump pulley and tighten the bolts to 20 ft. lbs. (27 Nm).
10. Install the accessory drive belt.
11. Install the cooling fan and shroud.
12. Fill the cooling system.
13. Connect the negative battery cable.
14. Start the engine and check for leaks.

Hope helps.

I'm assuming that your Jeep have a 5.2L V8 engine (as mine), then check this procedure...

Grand Cherokee 5.2L Engines
(see Figure 6)

1. Disconnect the negative battery cable.
2. Open the radiator valve and drain the cooling system.
3. Remove the cooling fan and shroud as an assembly.
4. Remove the accessory drive belt.
5. Remove the water pump pulley from the hub.
6. Disconnect the hoses from the water pump.
7. Loosen the heater hose coolant return tube mounting bolt and nut and remove the tube. Discard the O-ring.

Fig. 6: Water pump mounting bolt locations

1. Remove the water pump mounting bolts.
2. Loosen the clamp at the water pump end of the bypass hose. Slip the bypass hose from the water pump while removing the pump from the engine. Discard the gasket.
   

To install:

1. Clean all gasket mating surfaces.
2. Guide the water pump and new gasket into position while connecting the bypass hose to the pump. Tighten the water pump bolts to 30 ft. lbs. (40 Nm).
3. Install the bypass hose clamp.
4. Spin the water pump to ensure the pump impeller does not rub against the timing chain cover.
5. Coat a new O-ring with coolant and install it to the heater hose coolant return tube.
6. Install the coolant return tube to the engine. Ensure the slot in the tube bracket is bottomed to the mounting bolt. This will properly position the return tube.
7. Connect the radiator hose to the water pump.
8. Connect the heater hose and clamp to the return tube.
9. Install the water pump pulley and tighten the bolts to 20 ft. lbs. (27 Nm).
10. Install the accessory drive belt.
11. Install the cooling fan and shroud.
12. Fill the cooling system.
13. Connect the negative battery cable.
14. Start the engine and check for leaks.

Other details can find in your repair manual ZJ-Secc-7-Cooling-System

Hope thats help.

Check:
- Fresh Air Intake Hose: Clogged or Damaged FreshAir Intake Hose.
- Carburetor: Worn, Faulty or Damaged Carburetor.
- Mass Air Flow Sensor: Damaged, Loose, or Faulty Mass Air Flow Sensor or Circuit.
- EGR Valve: EGR Valve Sticking Open/Leaking.
- Idle Air Control Valve: IAC Valve Sticking or Faulty.

Good luck.

Yes use penetrating oil on it first to ease it comming out

1. Clean gasket mating surfaces.
2. Using a new gasket, install water pump to engine as follows: Guide water pump nipple into bypass hose as pump is being installed. Install water pump bolts Tighten water pump mounting bolts to 40 N·m (30 ft. lbs.) torque.
3. Position bypass hose clamp to bypass hose.
4. Spin water pump to be sure that pump impeller does not rub against timing chain case/cover.
5. Install a new O-ring to the heater hose coolant return tube Coat the new O-ring with antifreeze before installation.
6. Install coolant return tube and its mounting bolt to engine Be sure the slot in tube bracket is bottomed to mounting bolt. This will properly position return tube.
7. Connect radiator lower hose to water pump.
8. Connect heater hose and hose clamp to coolant return tube.

they make a uv dye you can put in there and run it till it leaks and you put on the glasses and shine the light that comes in the kit arund and where it is leaking will glow but it sounds like the leaks are just the rad hoses or heater core hoses

1. Remove negative battery cable
2. Open radiator valve - drain cooling system
3. Remove cooling fan and shroud
4. Remove belt
5. Remove water pump pulley from hub
6. Remove hoses from water pump
7. Loosen heater hose coolant return tube mounting bolt and nut.
8. Remove the tube. Lose the O-Ring.
9. Remove water pump mounting bolts
10. Loosen the clamp on the bypass hose.
11. Remove the hose as you pull the pump away from the engine.

Hope this helps

Mike