Passenger side:
- Remove the black plastic vent cover (one screw, give it a 1/4 turn and pull)
- remove the under dash panel (3 screws)
You'll 2 plastic covers with sliding tabs, one (rectangular) hides the cabin micron filter, the other one hides the blower.
The blower is retained by four screws, the regulator is attached to the blower with 2 screws.