Working with the cab down makes it really pleasant and well lighted.
Releasing the side of the footwell towards the center console to be able to fish the AC cable with its two connectors down from its upper location. A bit tricky, but more time consuming than hard.
Unboxing of the new unit, unstructured task in the middle of the rest due to eagerness
Back to the ongoing task, pressing the AC connectors and cabling through the hole in the back of the lower part of the center console to align with the bottom slot for its new placing.
Reconnecting the AC control unit.
Sliding the unit into the slot and attaching the two black screw on the side. Note that holes for these screws only exist in the most upper or most bottom slots.
Putting back the bottom plastic part that had to come of while mounting the AC unit. Just gently pryed out and snapped back in again.