Did you make sure you filled the radiator up and got the overflow tank up to the correct level? Sometimes when you flush and drain the system and fill it back up air pockets can get trapped in the system. Start the jeep up with the radiator cap off and wait for the coolant to start flowing and when the air pockets make their way through they will escape and you can add more antifreeze.
Also, did you make sure you installed the thermostat so it is facing the right direction?
Good Luck
You have air in the system. when you drained the coolant and refilled the system you probably filled the radiator when the system wasnt running.....So when the jeep is cold take the cap off the radiator and start the car, keep pooring anti-freeze in the system until it is topped off completely, when the thermostat opens it should **** in more fluid, just keep adding until you cant add any more. When your system is full of fluid you will have heat again.
Might be that all the air is not out of the cooling system. The heater wont work with air in it or if is low on coolant.
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