lack of heat of passenger side

i also have a 2011 dodge. i have the same problem where the heat is cold on passenger side but the drivers side can get hot if its all the way up. To my knowledge the back still gets hot also. did you ever figure what the issue was? i keep seeing to flush the heater core by reversing the hoses. just looking for another opinion from someone with same year and model.

My 2010 Journey has the same issue on passenger side. I let car idle while checking them out and can feel it get colder or Luke warm when turning heat control. But, when driving it is ice cold. Actuator is working properly. I even unhooked motor and moved blend door manually. Everything works fine. Drivers side works properly. Guess I don’t understand why it would be a heater core issue. Wouldn’t both sides lose heat, since the Journey has only 1 core.

I work on these cars daily at a car dealer. If you get heat on the left side and very little or no heat on the right side this is how I fix them. First make sure the temp actuator motors are working. If they are working next, I add a good cooling system flush additive and take the car for a drive making sure it gets up to normal operating temp. After the engine cools down open the radiator cap slowly. Access the hoses going to the heater core and remove them. Hook up your flush tools. We use a cooling system flush tool that pulses water with air pressure. I flush them a hour or more reversing the hoses a few times. I have found a garden hose doesn't work very well on these cars. Hook up your hoses and then flush the entire cooling system. Refill with required amount of antifreeze. Now with any luck when you retest for heat you will be nice and warm. If not, you can try flushing the core again or replace the heater core. I have replaced quite a few cores. I work on Chrysler, Dodge, and Jeeps. Hope this helps you. Good Luck

After troubleshooting my Journey for several hours, I confirmed my blend doors are working correctly and my heater core is not plugged up. I did find my cabin air filter was plugged up though. With defrost on high heat, I could only get 96 degrees F air blowing out. Then while looking under the hood I noticed condensation on the AC lines in the engine compartment, but the AC was not turned on with the button on the dash. I checked under the dash, and I could feel the evaporator coil was cold through the plastic right next to the heater core. The AC lines in the engine compartment were also ice cold to the touch. After shutting off the vehicle, I pulled fuse number 168 (AC clutch 10 amp) in the engine compartment by thje air filter. As soon as I pulled this fuse, I restarted the Journey and the defrost temp went all the way up to 120.5 degrees F. For some reason the AC compressor is being told to run all the time. I am going to leave the fuse pulled for now since it is colder out but will check to see if my R134a has low pressure. I read that low coolant pressure will cause this. I hope this helps someone. It is dangerous to not even have enough heat to defrost your winshield.