2012 Dodge Avenger Complaints

Little to no heat coming from vent on passenger side of cabin. Good hot heat coming from vents on driver side of cabin. Over the last 3 yrs the heater core has been replace 3 times once each year. Hot air came from all vents when replaced but as another comes around, no heat again on passenger side. Good heat on drivers side. Charlies dodge doesn't want to work on it any longer even though there is a valid warranty on the latest heater core replacement. Charlies dodge is claiming something inside the engine is coming apart and clogging the heater core. This makes no sense.

Window Defrost and Passenger Side Heat/Air. Either while in motion or while driving, no heated air exits the passenger side of the windshield defroster, nor the passenger window defrost, lower and center console vents. Heated air only exits the driver's side windshield and driver's side dash vents. This results in the passenger side of the front windshield being fogged up and low visibility. Problem persists through all cabin air modes and circulations. This safety issue effects visibility and passenger safety by failing to defrost/defog windows and keeping cabin tempuratures near or below freezing during cold weather (blowing cold air into the cabin). I've looked online and there are many reports of this problem, including Dealer Star Case - S1207000008, and multiple dialogs on various forums (like https://www.avengerforumz.com/threads/passenger-side-no-heat-from-vents.60250/). There's a picture showing the sludge within the heater core - I'll copy and include that picture below....

Window Defrost and Passenger Heat /Air. While either in motion or while driving, no heated air exits the passenger side of the windshield defroster, nor the passenger window defrost, lower and center console vents. Heated air only exits the driver's side windshield and driver's side dash vents. Problem persists through all cabin air modes, and circulations. This safety issue effects visibility and passenger safety by failing to defrost/defog windows and keeping cabin tempuratures near or below freezing during cold weather (blowing cold air into the cabin).

Just got this car from the dealers used with only 97000 miles and first time I used the heat and I have no heat on right side of car just drivers side vent. Not even the center vents blow hot air. Please help

The right side of my cars heating does not work. There is only 1 vent (the driver left vent closest to the window) that actually blows luke warm air, but all the other vents blow ice cold air. This happens with the heater turn all the way up.