Mercedes-Benz ML320. Service manual — part 667

Fig. 45: Identifying Blower Switch - Model 163 As Of 1.9.01 With Code (580a Automatic Air
Conditioning

AIR DISTRIBUTION SWITCH, FUNCTION - GF83.25-P-2101-01GH

Function

Turning the air distribution switch causes two wire cables to move the air distribution flaps, in order to route air
through the air distribution system to the air vents. The air vents are:



defroster vents for windshield/side windows



center air vents



lower air vents

There are 12 possible indented positions for air distribution.

AIR DISTRIBUTION SWITCH, FUNCTION - GF83.25-P-2101-01GI

Function

The air distribution can be set manually or automatically:



Manual



Turning the air distribution switch

Blower
switch,
location

The blower switch (1) is located on left in the AAC push-button control module (N22).

Blower
switch, task

The blower switch (1) activates several blower stages in fresh air and recirculating air
mode.

Blower
switch design

The blower switch (1) is equipped with a rotary ring with which the blower levels can be
set. The LEDs in the rotary ring display the set blower level.

Blower
switch,
function

The blower switch (1) sets the control voltage for the blower regulator in 6 stages and 5
intermediate settings via the push-button control module, depending on the setting. This
facilitates blower speed control of 0 -100 %.

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me



Automatic



Pressing the Auto button (

)

Turning the air distribution switch on the AAC push-button control module (N22) actuates the various air
distribution actuators via air conditioner bus.

The following basic settings for air distribution are provided:



Air flow from center and side vents



Air flow at center, side,

footwell and defroster vents



Air outlet at the center, side and defroster vents



Air flow at center, side and footwell vents

Apart from the 4 listed basic settings, a further 8 intermediate settings can be selected.

AIR DISTRIBUTION SWITCH, LOCATION - GF83.25-P-2101-02GH

Heater depiction

The air distribution switch (3) is located in the heater control unit (S98).

Fig. 46: Identifying Air Distribution Switch

AIR DISTRIBUTION SWITCH, LOCATION/TASK/DESIGN/FUNCTION - GF83.25-P-2101GH

MODEL 163 up to 31.8.01

Air distribution
switch, location

GF83.25-P-
2101-02GH

Air distribution
switch, task

The air distribution switch regulates the flow of air through the air
distribution system to the air vents for ventilation of the passenger
compartment.

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me

AIR DISTRIBUTION SWITCH, LOCATION/TASK/DESIGN/FUNCTION - GF83.25-P-2101GI

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

Fig. 47: Identifying Air Distribution Switch - Model 163 As Of 1.9.01 With Code (580a) Automatic Air
Conditioning

TEMPERATURE SELECTOR WHEEL, FUNCTION - GF83.25-P-2102-01GH

Function

Heating

By rotating the temperature selector wheel, a cable is moved via a disk cam, thereby actuating the blending air
flaps.

Air conditioning

The air temperature is regulated by a rotary control with a variable resistor. Signals from the resistor and AAC
control module determine the desired interior temperature. If the temperature selector wheel is turned in an anti-

Air distribution
switch, design

The air distribution switch is designed as a rotary switch with 12
indented positions for air distribution.

Air distribution
switch, function

GF83.25-P-
2101-01GH

Air distribution
switch, location

The air distribution switch (3) is located on the right in the AAC
push-button control module (N22).

Air distribution
switch, task

The air distribution switch (3) controls the air flow to the air outlets
for ventilation of the passenger compartment.

Air distribution
switch, design

The air distribution switch (3) is equipped with a rotary ring, with
which the air distribution can be set. The LEDs in the rotary ring
display the air distribution level.

Air distribution
switch, function

GF83.25-P-
2101-01GI

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me

clockwise direction to the final indented position (max. cooling), the recirculation switch is bypassed and thus
the fresh air flaps closed, in order to achieve the max. interior cooling (with A/C ON).

TEMPERATURE SELECTOR WHEEL, FUNCTION - GF83.25-P-2102-01GI

Function

The desired in-car temperature is set by turning the temperature selector wheel on the AAC push-button control
module (N22).

The AAC push-button control module (N22) compares the desired temperature with the temperature in the
passenger compartment. The passenger compartment temperature is determined by the in-car temperature
sensor on the AAC push-button control module (N22) and the temperature sensor for the vent air at the center
nozzle, front and rear footwells.

Using the comparison between specified and actual values, the AAC push-button control module (N22)
determines the correct setting of the blending air flaps and actuates these. The selected temperature is reached
and maintained as quickly as possible, if warming or cooling of the interior is necessary.

TEMPERATURE SELECTOR WHEEL, LOCATION - GF83.25-P-2102-02GH

Heater depiction

The temperature selector wheel (2) is located in the heater control unit.

Fig. 48: Identifying Temperature Selector Wheel On Heater Control Unit - Model 163

TEMPERATURE SELECTOR WHEEL, LOCATION/TASK/DESIGN/FUNCTION - GF83.25-P-2102GC

MODELS 163 up to 31.8.01, 168 up to 28.2.01

Temperature selector
wheel, location

Model 168

GF83.25-P-
2102-02GC

Model 163

GF83.25-P-
2102-02GH

Temperature selector The temperature selector wheel serves to preselect the

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me