Sure thing, this will be lengthy....
2015 CC Express, 5.7, 6 speed. Originally RA1 w/ 7 speed HVAC blower.
Upgraded to an Infotainment UAQ kit. Early kit (Dec '17) with new radio 68331631AH and HVAC module 68268186AA. Realized the temp control issue in spring of '18 (on screen slider is biased to hot, full cold with the slider was still mostly hot)
Based on work by other forum members, I swapped out the supplied HVAC control module for PN 68366552AA. This did not correct the temperature problem. This was purchased used on eBay.
I then purchased a new 68366552AA, as I wanted to be sure there wasn't an issue with the module, it didn't help.
Tried UAS radios PN 68274757AI and 68331635AH and saw the same response. These were both supplied by Infotainment.
From there I decided to try and see if ATC would fix the issue. To avoid another connector interface, Mpgrimm2 built a complete harness with ATC provisions; this replaced the Infotainment harness. Once installed, along with the necessary temperature and humidity sensors, I confirmed single zone MTC control was the same as before. Once reconfiguring for single zone ATC (using Alpha, changing to dual zone ATC first), the on screen temperature slider properly controlled the temperature blend door actuator. First time since using the rotary knob on the original bezel!
It's still a head scratcher. Throughout the process I've ruled out the radio, harness, and HVAC control module. All HVAC actuators would calibrated properly using Alpha, and no codes were being set to either the BCM or the HVAC (climate) control module.
Sent from my SM-G965U using Tapatalk