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If both hoses that go to the firewall are hot then you should be circulating coolant through the heater core. I would look to the temperature blend door in the heater box.
if there is not even luke warm air coming from the heater it may be caused by the blend air door motor. on some of the jeeps they came out with a new upper heater housing that was a new design. I believe if your vehicle had this update the dealer would be able to check TSB's for the cause. other wise like I said, most likely the blend air door and/or motor
Jeeps are notorious for having broken temperature control (Blend Air) doors. A malfunctioning Blend Air Door actuator probably caused it to break. The dash will have to be removed to replacethe door and the door actuator.
First while the engine is cool remove radiator cap and make sure it is full of coolant. Run the engine till temperature reaches mid way on gauge.Feel radiator and heater hoses, should be very warm to touch,if hoses are cool, thermostat might be stuck open. If hoses are hot, sit in passenger seat and turn heater controls to high heat, turn control to make air come out dash vents , from left to right feel temperature of air from vents .A temperature change can mean a problem with the air inlet door, mode door or blend door . This seems to be a common problem. Further inspection will be needed to verify which actuator and door is the problem. There is a Technical Service Bulletin with infomation and a list of parts you can get from your dealer. This is not an easy job, most if not all of the heater housing will have to be remove. Hope this helps. If this is your problem and you dicide to do the repair I can give some help with information on removing dash components.This can be a 4 to 9 hour job depending on with part is bad.
You most likely have a problem with a part called the air temperature control blend door, it controls the air flow across the AC core or heater core, it is most likely warped or the motor that operates it is defective or in most cases both are in need of replacing. This repair requires the entire dash be removed to access the AC parts.
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