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most air vent grills are installed before the dash is put in the car to that end you will probably have to remove the dash to get to the back mounting nuts to remove the vent
Under neath the venting system behind console there is a venting housing that can be removed. Likely the air flow directional vent flap is stuck or the motor that moves the vent is faulty.
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.
You can usually remove the old vents using a small flat bladed screwdriver and inserting it in the space between the dash and the vent (where the vent pivots) and gently prying up until the vent comes out. Replacing the vent is easier, just very carefully snap it back in the pivot holes. If the space seems a little tight, use the screwdriver to gently pry the dash out alittle till the vent goes into place.
Have replaced my heater core in my 2001 regular cab 4wd in december 2009. Had to pull the complete dash including the complete metal dash behind the dash that you see. Also had to remove the right passenger side inner fender well to acess the remaining two bolts that hold the heater core cover to the firewall. Its an insane job to do but the repair shop books call for 9 1/2 hrs to do the job. I'm not an expert but this is what it takes.
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