2001 Tahoe - Climate Control (No Blend Door Activity)

[corporal_clegg]

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 cabin was not. the heater core seems to be ok, as are the vent controls and blower speed control. I determined that the Blend Door actuator was not functioning. I removed the old Blend Door Actuator and replaced it with a new part (Dorman). before installation I hooked up the plug and got no response with the ignition on and rolling from cool to warm on the selector and also manually opened and closed the blend door.

is it possible that the blending control itself is bad?

can the computer be malfunctioning?

is the computer "brain" housed with the 3 controls on the operation panel?

please respond with any advice/answers/experiences with this sort of issue. thanks for your time.