Mercedes-Benz ML320. Manual — part 661

Fig. 25: Identifying Rear Nozzle

SERIES RESISTOR GROUP, LOCATION/TASK/FUNCTION - GF83.10-P-2161GC

MODEL 163 up to 31.8.01, 168

Rear nozzle
position

The rear nozzle (1) is located at the rear center console.

Rear nozzle
task

The rear compartment nozzle provides specific rear compartment
ventilation in addition to the rear footwell air vents.

Rear nozzle
function

GF83.10-P-
2111-01GI

Series resistor group,
position

Model 168

GF83.10-P-2124-
01GC

Model 163

GF83.10-P-2124-
01GH

Series resistor
assembly task

The series resistor assembly controls the blower voltage
depending on the relevant blower level setting.

Series resistor
assembly function

Model 168 up to 28.02.01

GF83.10-P-2124-
02GC

Model 168 as of 01.03.01

GF83.10-P-2124-
02GH

Model 163

GF83.10-P-2124-

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me

REAR BLOWER MOTOR, FUNCTION - GF83.10-P-2168-01GI

Function

The rear blower motor (M2/1) is actuated using the blower button (

) on the rear ventilation control panel

(N72/2s3).

Pressing the blower button (

) passes a control voltage to the rear blower motor (M2/1) via the electronic

rear ventilation blower regulator (N29/2). This facilitates blower speed control of 0-100 %.

Automatic mode function

Pressing the Auto button (

) on the rear ventilation control panel (N72/2s3) causes the rear blower motor to

be regulated by the AAC push-button control module (N22).

REAR BLOWER MOTOR, POSITION/TASK/DESIGN/FUNCTION - GF83.10-P-2168GI

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

Fig. 26: Identifying Rear Blower Motor

02GD

Blower,
location

The rear blower motor (M2/1) is located behind the rear nozzle below
the center console.

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me

BLOWER MOTOR FUNCTION - GF83.10-P-2170-01GI

Function

The AAC push-button control module (N22) passes a control voltage of 0-6 V to the blower regulator (A32n1)
via the AC bus. Depending on the control voltage which is present, this then regulates the blower motor
(A32m1) operating voltage of 0-12 V. This facilitates blower speed control of 0-100 %.

The blower motor actuation (operating voltage) is influenced by the following factors:



Blower power setting manual or AUTO



Operating functions:

Air distribution

AC OFF mode

Residual engine heat mode (actuation limited to 5 V)



Mode status (heating, cooling)



Coolant temperature



Vehicle speed



Fresh air/recirculation flap setting



Flap positions



Terminal 15 (blower ON), starter running (blower OFF)

BLOWER MOTOR LOCATION/TASK/DESIGN/FUNCTION - GF83.10-P-2170GI

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

Blower, task

The rear blower motor (M2/1) serves to improve ventilation and cooling
in the rear.
The air that is drawn in by the blower in the evaporator housing is led to
the rear blower motor (M2/1) via air ducts.
The rear blower motor (M2/1) increases the flow of air.

Blower,
function

GF83.10-P-
2168-01GI

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me

Fig. 27: Identifying Blower Motor

REAR SHUTOFF FLAP ACTUATOR MOTOR FUNCTION - GF83.10-P-2171-01GI

Function

Pressing the rear compartment air distribution button (

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

actuates the rear shutoff flap actuator motor (M12/2) via the AC bus. The rear shutoff flap actuator motor
(M12/2) therefore controls the rear shutoff flap, which opens and controls the air supply to the rear blowout
ducts.

Blower
motor
location

The blower motor (A32m1) is to the bottom right of the evaporator housing
below the glove compartment.

Blower
motor task

In fresh air mode the blower motor draws in fresh air via the fresh
air/recirculating air flap. In recirculating air mode, air from the vehicle interior
is drawn into the evaporator housing via the fresh air/recirculating air flap.
When residual engine heat utilization is being used, the blower motor circulates
the air around the interior.

Blower
motor
design

The blower motor is designed as a radial blower.

Blower
motor
function

GF83.10-P-
2170-01GI

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me