I put the switch in tonight but I will tell you the instructions listed here can get you into trouble. The vent box is designed to remove in one piece
do not remove the grill by itself as it is very easy to break trying to force it on or off.
The grill itself is held on by a series of tabs that lock the grill to the vent box. There are four tabs holding in the vent box, two on each side, which you can access through the grill. Using a small screwdriver or Exacto knife pull the tabs in towards the center of the vent while pushing the vent box up. Work it back and forth carefully and the entire assembly will come out providing access to the two screws on the dash panel.
The entire vent assemble snaps in easily, slide it in and back working the foam seal in under the dash. Once it bottoms out press in down and it will snap into place.
I was very careful but managed to break the mounting tabs on the grill in several spots.
Attachment 6017