L322 Range Rover System Description and Operation
AIR CONDITIONING
DESCRIPTION AND OPERATION
82-43
Flap Control – High Line System
The position of the ram air flaps is automatically controlled by the ATC ECU. The positions of the recirculation flaps
and the distribution flaps are either automatically controlled by the ATC ECU or manually controlled by the related
switches.
Ram Air Flaps
The ATC ECU progressively closes the ram air flaps, in four steps, as vehicle speed increases, and opens them again
as vehicle speed decreases. At the maximum closed position, 90% of the fresh air inlet area is closed off. A hysteresis
of 9 mph (15 km/h) prevents the ram air flaps from hunting at a constant vehicle speed.
Ram Air Flap Positions
A = Flap position, % open; B = Opening speeds, mph (km/h); C = Closing speeds, mph (km/h)
M82 0816
0
20
40
60
80
100
28
(45)
47
(75)
63
(100)
91
(145)
38
(60)
100
(160)
56
(90)
72
(115)
A
B
C