UPDATE - After 3 separate trips to the dealership, my 2021 Durango R/T TnG finally makes heat in the middle setting for the front seats.Hoping I will have similar news on my medium heat soon. Mine goes in for the new module install tomorrow.
Stellantis literally did everything they could think of to avoid putting an AD revision module in it:
1. First they told me everything was working just fine... within 1 degree of factory specs!
2. Then they told me the truck was only supposed to have 2 levels of heat in the front seats, despite the owner's manual, the physical buttons, and the UConnect headunit all clearly depicting 3 positions. I literally had to send them a photo of the owner's manual page where the 3 seat heat levels are explained.
3. They made the tech reset/reconfigure the existing AC module.
4. They made him replace the "center stack" of buttons under the UConnect5 display.
5. ONLY after my dealership pushed them with the images of of customer receipts posted here would Stellantis let them put the AD module in. Even then, they only did so begrudgingly as a "test". UGH
So instead of just fixing it the first time for the cost of a $60 module and an hour of labor, they made me go to the dealership multiple times, they paid for my rental car for 10 days, they threw over $400 of unnecessary parts at it, and they paid for untold hours of dealership tech time.
All this when they had been TOLD what the solution was. People should get fired for this level of incompetence at Stellantis. I honestly feel bad for the dealerships and the techs who have to put up with this sh*t.