On the lower right instrument panel is a lower black cover, it can be removed to access the right side heater/ac box(large black unit). On some models the instrument panel had to be lowered, on others you can see where the motor is screwed in by following its twisted wires usually green and black.
If you can get to the cover screws that hold it in, it comes out. Not an easy job, but I never had to do too much to get it out. Just remove plastic panels to access the 3 screws.