I watched you video on replacing the blend door actuator.
Driver side blend door actuator 2004 chevy silverado.
It seems like the actuator is being told to turn the shaft to heat.
I successfully removed the old and installed the new.
Replacing the driver side blend door actuator acdelco 1572972 and reseting the blend doors for the front a c system.
My a c was stuck on just hot but this.
I removed the new one and tried seeing if the actuator would move when adjusting temp.
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The actuator moves the blend door in your silverado s heating and air system to achieve the proper mix of hot and cold air.
It was still blowing hot out of the driver s side.