DIRECTIONAL AIR TIMING ACTUATOR (EVAPORATOR BOX) This is the small motor on the right-hand side of the 348 and F355 evaporator assembly which manages air diffusion from the footwell to the dashboard vents to the upper windscreen defrost vents. The motor actuators a tambour rolling door to deflect airflow as requested by the HVAC ECU module. When this motor fails to operate, the airflow is most often 'locked' into a single position within the vehicle.