Fresh air/recirc actuator replacement

when I have climate control running in my 2005 Prius on recirc during warm weather, I get a mostly continuous clicking noise. I have pulled my dash apart and tracked it down to the recirc actuator that is smushed between the heater box and the blower box, near the top of the dash.

Question is, how do I get to the actuator? I have pulled just about as much as I can off the dash, but I can't seem to get the lower half of the blower box to come loose. I have the top half of the heater box loose, but can't pull it out because one of the mounts is hooked under the metal dash bar. Has anyone done this before?

 

I did actually. My mistake was trying to remove the heater box. Instead of doing that, I found the actuator is held on by three or four screws and then it detaches from the side of the hvac box. I had disassembled about the right amount of the dash to reach it. For anyone reading this, the heater box stays in the car and you remove the actuator (a slim black rectangle) from the side of the header box.

It fixed half of the problem, but the blend door (hot and cold) actuator was also making noise. This actuator is located on the left side underneath the dash, and there is _just_ enough room to remove it without having to take the dash apart. This youtube video:

pointed me to some ultra-low profile screwdrivers available on Amazon that are able to reach into the tight space and remove the screws. It took about 10 minutes per screw but it saved hours of disassembly.