Overhaul

NOTE:
- Before reassembly, make sure that the air doors and linkage move smoothly without binding.
- When reattaching the recirculation control motor, make sure its positioning will not allow the air doors to be pulled too far. Attach the recirculation control motor and all linkage, then apply battery voltage and watch the movement of the doors. If necessary, loosen the holding screw and move the recirculation control motor up or down.