Mercedes-Benz ML320. Manual — part 656

Fig. 4: Identifying Air Duct (Up To 31.08.01)

AIR DUCT LOCATIONS - GF83.10-P-2101-01GI

The lateral nozzle and side window defroster nozzle (3) air ducts are on the left and right below the instrument
panel.

The windshield defroster nozzle air duct (2) is on top of the evaporator housing (front center) below the
instrument panel.

The center nozzle air duct (1) is on top of the evaporator housing behind the center nozzle.

The front footwell air duct (4) is integrated in the heater/evaporator housing.

The rear compartment air duct (5) is located below the center console.

The rear footwell air duct (6) is at the bottom next to the rear blower behind the center console.

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me

Fig. 5: Identifying Air Duct (As Of 1.09.01)

BLOWER, LOCATION - GF83.10-P-2102-01GH

The blower (M2) is below the instrument panel to the bottom right of the heater box/evaporator housing (3).

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me

Fig. 6: Identifying Blower And Heater Box/Evaporator Housing

BLOWER, FUNCTION - GF83.10-P-2102-02GH

Function

Different control voltages are provided at the blower (M2) via the series resistors depending on the blower
switch setting. This produces different blower (M2) speeds.

BLOWER, LOCATION / TASK / DESIGN / FUNCTION - GF83.10-P-2102GC

MODEL 163 up to 31.8.01, 168

BLOWER CONTROLLER FUNCTION - GF83.10-P-2103-01GI

Function

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

The Auto button can also be used to select

(

) automatic mode.

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

Blower,
location

Model 168

GF83.10-P-
2102-01GC

Model 163

GF83.10-P-
2102-01GH

Blower,
task

In fresh air mode the blower (M2) draws in fresh air, and in recirculating air
mode it draws in air from the vehicle interior into the heater or evaporator
housing via the recirculating air flap.

Blower
design

The blower (M2) is designed as a twin-pipe radial blower.

Blower,
function

Model 168

GF83.10-P-
2102-02GC

Model 163

GF83.10-P-
2102-02GH

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me

The blower regulator then controls the blower motor operating voltage, depending on the actual measured in-car
temperature and the selected target temperature

(0-12 V). This facilitates blower speed control of 0-100 %.

DUST FILTER, LOCATION - GF83.10-P-2104-01GH

The dust filter (1) is behind the instrument panel bottom section at the passenger side in the heater/evaporator
housing.

Fig. 7: Identifying Dust Filter

REAR VENTILATION, FUNCTION - GF83.10-P-2105-01GC

Function

The louvered-type flaps in the rear vent open from the pressure of the air flowing through the vehicle and allow
it to exit.

If a vacuum is present in the vehicle, as happens when driving with a window or the sliding roof open, the flaps
close automatically due to the force of gravity. This prevents exhaust gases, dust and moisture from being
sucked in.

REAR VENTILATION, LOCATION - GF83.10-P-2105-02GH

The rear vents (1) are located on the left and right behind the rear bumper.

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me