It's on the left side of the console.
Way up High.
Put your back in the driver's footwell, your head near the accelerator pedal.
Flashlight in hand.
It's above the heater/ac box.
Very easy to disconnect it's electrical connector, to determine it it is the one making noise.
And yes there are four of these actuators total..as shown in the manual you included in your post.
Air inlet door
temp blend door
And this left of console one....panel/floor door