Try the set point at 72deg or higher. My 22R1T had this issue in the past. Anything below 72 would blow cold. Also, if I try closing back vents the truck hates me and blows cooler air. If I leave back vents on, it is happy. Who knows why...
Taking your foot off the accelerator is the same as putting your foot on the brake pedal. Tried and true Midwestern technique doesn't work in an EV with regen breaking. Low is the lightest option with a Rivian. There is no "off" option. Sorry this happened to you.
My experience with 2022 R1T
- temp around 72-74
-auto (leave back vents on, if I turn off back vents, fronts get cold)
Occasionally have to turn off and on if not warm.
Rivian mobile service from Normal told me that council bluffs service center is not up and running yet but they have a guy starting on 11/1 providing mobile service out of council bluffs