Have Jeep Questions? Ask a Jeep Repair Expert for Answers
Good afternoon and welcome to JustAnswer!!
The first thing you need to do is check both heater core lines to see if they are both equally hot, if not then I would flush the heater core, and if they are both equally hot then your issue will be a blend door actuator or door itself.. I would start by checking to see if the actuator is moving, and if it is then remove the actuator and see if you can spin the door all the way around and if so then the door is broke and the dash will need to be removed to replace
I hope this helps and thank you for the positive rating,
Don't forget to rate so I'm compensated for my time..