Re: Dual Zone temperature problem - 2012 Overland
I experienced the same issue and found it to be the blend doors in HVAC unit. It is a common fault and can be easily sorted.
You can buy blend doors of eBay, and there are a few users showing installation instructions on YouTube.
I have had this issue for over a year and with winter drawing in thought it was time to get it sorted.
It is really easy to sort out, and you can save your self a lot of money by doing it yourself.