Mercedes-Benz ML320. Service 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