If everything from your 2018 truck plugged directly into the new radio, without any adapter harnesses, then that is not a UC5 radio.
You can see if you can get the climate controls to show up in the radio by using AlfaOBD to change VehConfig 3: HVAC Configuration to “Dual Zone ATC”. Since you converted your 2018 to auto climate control, you probably have that setting set to “Single Zone ATC”, and that configuration does not work on a 2019+ Ram Heavy Duty 8.4” radio.
I have uc5 8.4 radio, everything works, only climate control doesn't work. And use 3knob ac manual module with 4speed ac. And I have adapter harness from big black connector to 2 green and blue connector for radio and 2 cables usb connector.easy can buy this connectors on ebay. Dodge just change connectors type on uc5, but still the same wires. Looks like they change shape of connectors to make money and trying to show uc5 only for new trucks.but uc5 works great on my 2018 and 2016 hd 3500 trucks. Thank you I will try to change it on alfa obd to dual climate. I really need to try it to put climate module back. I also have all wiring on dash and modules from dash board from 2022 truck, how do you I think can use 360 camera module on 2018 truck? I want put 360 cameras on my 2018 hd.
Just add 2 zone climate in alfa and truck start to show climate option but still can not change temperature normally on push one time up always going to hottest and one tap on cold always going on maximum ac. I can not upload video here. In display can move temperature but not with bezel buttons.
Now trying to turn back in alfa obd to single climate, but nothing changes after, still shows double climate ((
Upd changed to single working