Where is the A/C actuator blend door that controls driver's side located?

Yep, good call, the driver's side blend door actuator is a common failure, here is the location to make sure you get the correct part replaced to help fix the problem. To be sure you have the correct actuator with the part removed, turn the system on and work the door pivot be hand to see if the driver side changes. You will need to remove the glove box which it sounds like you have already done. Check out the images (below). Let us know how it goes.