XJR (X308) V8-4.0L SC (AJ26) (1998)
Air Distribution Box (ADB)
The upper air distribution box ADB, is fixed to the defog duct and instrument panel assembly, and seals by contact pressure to the outlet (top) of the air
conditioning unit. The ADB incorporates two servo motor operated flaps which regulate airflow to:
Windshield and door drop glass
Instrument panel - center, left hand and right hand vents
The center vent duct incorporates a baffle plate which balances the volume of air flow between the center and right and left hand vents.