Mercedes-Benz ML320. Manual — part 662

If a problem exists, it is possible to retrieve and verify the defined end positions by means of the diagnosis
assistant system (DAS) (valuation trip).

After replacing an actuator motor an adjustment run must be performed via the Diagnosis Assistant System
(DAS), i.e. the end positions flap OPEN and SHUT are defined and retained.

REAR SHUTOFF FLAP ACTUATOR MOTOR LOCATION/TASK/FUNCTION - GF83.10-P-2171GI

MODEL 163 as of 1.9.01 with CODE (580a) Automatic air conditioning

Fig. 28: Identifying Rear Shutoff Flap Actuator Motor

CENTER OUTLET FLAP ACTUATOR MOTOR - GF83.10-P-2172-01GI

NOTE:

All actuator motors are identical.

Rear shutoff flap
actuator motor
location

The rear shutoff flap actuator motor (M2/12) is to the left of the
automatic air conditioning housing.

Rear shutoff flap
actuator motor task

The rear shutoff flap actuator motor (M2/12) operates the rear
shutoff flap for controlling the flow of air to the rear
compartment nozzle.

Rear shutoff flap
actuator motor
function

GF83.10-P-
2171-01GI

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me

Function

Rotating the air distribution switch in the AAC push-button control module (N22) actuates the center outlet flap
actuator motor (M2/22) via the AC bus. The center outlet flap actuator motor (M2/22) controls the center outlet
flap, which adopts the following positions according to requirements.

Switching logic



center outlet flap closed = 0%



center outlet flap open = 100%

Automatic center outlet flap control (Auto button engaged)

The center outlet flap is opened depending on the following values



blending air flap setting



Coolant temperature



Evaporator temperature

linear up to 100 % open.

Center outlet flap control via push-button control module (Clock type switch setting of air distribution
switch)

If a problem exists, it is possible to retrieve and verify the defined end positions by means of the diagnosis
assistant system (DAS) (valuation trip).

After replacing an actuator motor an adjustment run must be performed using the Diagnosis Assistant System
(DAS), i.e. the flap OPEN and SHUT limit positions are defined and retained.

CENTER OUTLET FLAP ACTUATOR MOTOR, LOCATION/TASK/FUNCTION - GF83.10-P-2172GI

MODEL 163 as of 1.9.01 with CODE (580a) Automatic air conditioning

1 o'clock

2 o'clock

3 o'clock

4 o'clock

5 o'clock

6 o'clock

65%

82%

100%

68%

2%

0%

7 o'clock

8 o'clock

9 o'clock

10 o'clock

11 o'clock

12 o'clock

32%

68%

100%

82%

65%

50%

NOTE:

All actuator motors are identical.

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me

Fig. 29: Locating Center Outlet Flap Actuator Motor

REAR AIR DISTRIBUTION FLAP ACTUATOR MOTOR FUNCTION - GF83.10-P-2173-01GI

Function

Pressing the rear compartment air distribution button (

) on the AAC push-button control module (N22)

actuates the air distribution flap actuator motor (M2/21) via the AC bus. The air distribution flap actuator motor
(M2/21) therefore controls the air distribution flap, which opens and controls the air supply to the rear blowout
ducts.

If a problem exists, it is possible to retrieve and verify the defined end positions by means of the Diagnosis
Assistant System (DAS) (valuation trip).

After replacing an actuator motor an adjustment run must be performed using the Diagnosis Assistant System

Center outlet flap
actuator motor location

The center outlet flap actuator motor (M2/22) is to the right of
the center nozzle air duct, below the instrument panel.

Center outlet flap
actuator motor task

The center outlet flap actuator motor (M2/22) operates the
center outlet flap for controlling the flow of air to the center
nozzle.

Center outlet flap
actuator motor function

GF83.10-P-
2172-01GI

NOTE:

All actuator motors are identical.

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me

(DAS), i.e. the end positions flap OPEN and SHUT are defined and retained.

REAR AIR DISTRIBUTION FLAP ACTUATOR MOTOR, LOCATION/TASK/FUNCTION - GF83.10-P-2173GI

MODEL 163 as of 1.9.01 with CODE (580a) Automatic air conditioning

Fig. 30: Locating Rear Air Distribution Flap Actuator Motor

DEFROSTER VENT FLAP ACTUATOR MOTOR, FUNCTION - GF83.10-P-2175-01GI

Function

Pressing the defroster button (

) on the AAC push-button control module actuates the defroster vent flap

actuator motor (M2/8) via the air conditioner bus. The defroster vent flap actuator motor (M2/8) controls the
defroster nozzle flaps, which adopt the following positions, according to requirements:

Rear air distribution
flap actuator motor
location

The rear air distribution flap actuator motor (M2/21) is to the left
of the rear blower housing, behind the rear compartment nozzle.

Rear air distribution
flap actuator motor
task

The rear air distribution flap actuator motor (M2/21) operates the
rear air distribution flap for controlling the flow of air to the rear
compartment nozzle and the rear footwell air vents.

Rear air distribution
flap actuator motor
function

GF83.10-P-
2173-01GI

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me