Mercedes-Benz ML320. Manual — part 659

The series resistor assembly (R14) is comprised of three resistors which can be interconnected, via series
connection, to form an overall resistor. Depending on the setting of the blower switch, current is guided via the
resistors assigned to the set blower level to the blower (M2). Different control voltages are therefore present at
the blower (M2), as a result of which the blower (M2) operates at different rotational speeds.

COMBINATION FILTER, LOCATION/TASK/DESIGN/FUNCTION - GF83.10-P-2128GI

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

Fig. 20: Identifying Combination Filter

FOOTWELL FLAP ACTUATOR MOTOR, FUNCTION - GF83.10-P-2132-02GI

Pin assignment of series resistor assembly

R14

Assigned

resistor

Blower switch

setting

Blower (M2) control

voltage

Pin 1

R3

Blower level 3

10V

Pin 2

R2+R3

Blower level 2

8V

Pin 3

R1+R2+R3

Blower level 1

4V

Pin 4

None

Blower level 4

12V

Combination
filter location

The combination filter (1) is at the bottom of the automatic air conditioning box.

Combination
filter task

The combination filter (1) removes impurities and odors from the air flowing through
the automatic air conditioning box. Fresh air and recirculating air are filtered.

Combination
filter design

The combination filter (1) consists of fleece and a large number of so-called sliver
absorbers that are evenly distributed over an air-permeable carrier mat.

Combination
filter function

The combination filter (1) filters over 80% of particles from 0.3 in size and up to
100% of 0.5 u sized particles and pollen. The sliver adsorbers also continuously
absorb odors and pollutants and release them again in extremely small concentrations
after a certain time.

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 footwell flap
actuator motor via the AC bus. The footwell flap actuator motor (M2/21) controls the footwell flap, which
adopts the following positions according to requirements.

Switching logic



footwell flap closed = 0%



footwell flap open = 100%

Automatic footwell flap control (Auto button engaged)

The footwell flap is opened depending on the following values



blending air flap setting



Coolant temperature



Evaporator temperature

linear up to 100 % open.

Footwell 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 via the Diagnosis Assistant System
(DAS), i.e. the flap OPEN and SHUT limit positions are defined and retained.

FOOTWELL FLAP ACTUATOR MOTOR, LOCATION / TASK / FUNCTION - GF83.10-P-2132GI

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

17%

32%

50%

68%

85%

100%

7 o'clock

8 o'clock

9 o'clock

10 o'clock

11 o'clock

12 o'clock

66%

31%

0%

%

0%

0%

NOTE:

All actuator motors are identical.

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me

Fig. 21: Identifying Footwell Flap Actuator Motor

AIR INLET, LOCATION/FUNCTION - GF83.10-P-2138GC

MODEL 163, 168

AIR DUCTS, LOCATION/TASK/DESIGN - GF83.10-P-2139GH

MODEL 163

Footwell flap actuator
motor, location

The footwell flap actuator motor (M2/15) is on the left on the
automatic air conditioning box.

Footwell flap actuator
motor, task

The footwell flap actuator motor operates the footwell flap for
regulating the air flow to the front footwell.

Footwell flap actuator
motor, function

GF83.10-P-
2132-02GI

Air inlet, location

Model 168

GF83.10-P-2100-01GC

Model 163

GF83.10-P-2100-01GH

Air inlet, function

The fresh air required for
ventilation flows through
the air inlet to the
heater/air conditioning
housing.

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me

Design shown up to 31.08.01

Fig. 22: Identifying Air Ducts - Design Shown Up To 31.08.01

BLOWER REGULATOR, LOCATION / TASK / FUNCTION - GF83.10-P-2141GI

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

Air duct
locations

up to 31.08.01

GF83.10-P-
2101-01GH

as of 1.09.01

GF83.10-P-
2101-01GI

Air ducts
task

The air ducts (1-5) lead the air that is required to ventilate the vehicle
from the heater/ evaporator housing to the air vents in the vehicle
interior.

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me