87106-J, the upper one of the two you can see behind the glove box. - Wow. It looked so easy. Here is what to do -

Remove the glove box. Easy and simple.
Remove the black plastic hidden box within the glove box space. Easy, couple of screws.
You can see the actuator on its side in the metal frame. Remove the four mounting screws. Brass, I think.
The 4th screw, bottom, back, is the problem. Skipping the madness of my effort learning how to remove that screw, do this: Open the cabin filter box and remove the filter. On the left side of that enclosure, across from the head of that last screw, drill a hole big enough to get a skinny, small phillips screw driver through. That will allow you to remove the screw and the actuator. Disconnect the wiring harness from the actuator

Go to ebay to buy a used Denso-Made In Japan unit, part number 063700-8860. Search by that number, because Chevrolet uses the same actuator in the Camaro and those are newer. Do not buy one of the cheap Chinese junk units off Amazon. You will hate yourself next summer if you do.