GL 550 (164.886) V8-5.5L (273.963) (2008)
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In manual mode the air flap settings are determined by the selector on the center nozzle.
Left blending air flap actuator motor and right blending air flap actuator motor
The left and right blending air flap actuator motor serves for adjustment of the heating and air conditioning ventilation temperature.
The left and right blending air flap actuator motors are actuated according to a defined characteristic by the AAC control and operating unit depending
on the position of the temperature selector wheel and the actual interior temperature thereby moving the blending air flaps. The flaps open or close the
air passage through the heater heat exchanger in order to mix heated and fresh or cooled air in the correct proportions required to achieve the desired
interior temperature.
The set flap angle for the blending air flaps is determined by the AAC control and operating unit, depending on the following information:
^
regulated target temperature on the temperature selector wheel
^
the in-car temperature measured by the in-car temperature sensors
^
Coolant temperature
Blending air flaps closed
No air through mixing chamber and therefore no air heating
Blending air flaps opened
All air passes through the mixing chamber with maximum air heating
Left and right defroster flaps actuator motor
The left and right defroster flaps actuator motors actuate the defroster vent flap for control of the air flow to the windshield defroster vents and side
window defroster vents. The window defroster button on the AAC control and operating unit can be pressed to actuate the left and right defroster flaps
actuator motors via LIN bus, thereby actuating the defroster vent flaps.
With "defrosting" and "0", the defroster vent flaps are 100% open.
Manual flap control
(12 o'clock partitioning through actuation of air distributor duct button)
1 o'clock
2 o'clock
3 o'clock
4 o'clock
5 o'clock
6 o'clock
100%
100 %
100 %
67 %
21 %
0%
7 o'clock
8 o'clock
9 o'clock
10 o'clock 11 o'clock 12 o'clock
0%
0 %
0 %
23 %
65 %
100 %
Automatic flap control
The defroster vent flaps are opened linearly up to 100 % depending on the following values:
^
Blending air flap setting
^
Coolant temperature
^
Evaporator temperature
^
Relative humidity
Left and right footwell flaps actuator motor
The left and right footwell flaps actuator motors actuate the footwell flaps for control of the air flow to the front and rear footwells.
When the air distribution buttons on the AAC control and operating unit are pressed, the left and right footwell flap actuation motors are actuated over
the LIN bus, thereby actuating the footwell flaps, which can assume the following positions depending on the requirements:
Actuation for "Defrost" Footwell flaps 0 % (closed)
Actuation for "Rest"
according to control
Actuation for "0"
no change
Manual flap control
(12 o'clock partitioning through actuation of air distributor duct button)
1 o'clock
2 o'clock
3 o'clock
4 o'clock
5 o'clock
6 o'clock
29%
72 %
100 %
100 %
100 %
100%
7 o'clock
8 o'clock
9 o'clock
10 o'clock 11 o'clock 12 o'clock
54%
30 %
0 %
0 %
0 %
0
Automatic footwell flap control
The footwell flaps are opened linearly up to 100 %, depending on the following values:
^
Blending air flap setting
^
Coolant temperature
