blend door malfunction

I have a 2013 Tahoe LTZ 72000 miles. Torque converter shutter $2000 common place per dealership. Tranny grabbing gears. No warranty. Anyone else suffering with it? 1 of many issues like hvac blend doors, exterior handles breaking off... my 03 Z 71 went 175,000 before first repair water pump. Not...

greetings. I lost control of hot/cold blending on a lengthy trip last week. after a little troubleshooting, I determined that my rear controls were functioning, while my temp selector for the forward zone was not. the heater core seems to be ok, as are the vent controls and blower speed. I...