The settings of the dash vents are out of the dash customer controller as the links may be misaligned when the dash was taken out. So it is necessary to remove the dash and reset the linkages making sure that the vents are aligned to open flows as desired.
The heater / a/c vents are controlled by vacuum,or electronic devices. What is happening in your Trailblazer is the Vent Doors are either stuck in a open or closed position thus only having air flow to the floor vents only..The actual vent door is located in the heater box next to the blower motor.
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