Rear Climate Controls
When upgrading the radio in 2014-2015 Dodge Durango, the rear climate will not work correctly unless you replace the Rear Climate Controls (Part Number 68368988AA).
This will allow you to control the HVAC system in the rear via the Rear Climate Controls as well as leave the Rear Climate Controls on Auto so they match the front Climate Controls.
HVAC Module
If you wish to regain control of the rear HVAC system via the new radio screen's climate section then you will also need to replace the vehicle's HVAC Module (Part Number 68321559AD).
HVAC Module Location is behind the radio screen.