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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 
R14Assigned 
resistorBlower switch 
settingBlower (M2) control 
voltage
Pin 1R3Blower level 310V
Pin 2R2+R3Blower level 28V
Pin 3R1+R2+R3Blower level 14V
Pin 4NoneBlower level 412V
 Blower, 
locationModel 168GF83.10-P-
2102-01GC
  Model 163GF83.10-P-
2102-01GH
 Blower, 
taskIn 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 
designThe blower (M2) is designed as a twin-pipe radial blower. 
 Blower, 
functionModel 168GF83.10-P-
2102-02GC
  Model 163GF83.10-P-
2102-02GH
 
2001 Mercedes-Benz ML320 
1998-2005 HVAC Climate Control - 163 Chassis  
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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  
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Fig. 8: Identifying Rear Vents 
DEFROSTER NOZZLE, LOCATION - GF83.10-P-2106-01GH 
Windshield defroster nozzle    
The windshield defroster nozzle (1) is located   in the instrument panel below the windshield.  
Fig. 9: Identifying Windshield Defroster Nozzle
  
Side window defroster nozzles     
The side window defroster nozzles   (1) are located on the left and ri
ght in the instrument panel. 
 
2001 Mercedes-Benz ML320 
1998-2005 HVAC Climate Control - 163 Chassis  
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Fig. 10: Identifying Side Window Defroster Nozzles 
CENTER NOZZLE, FUNC TION - GF83.10-P-2107-01GH 
Function   
The dial on the left allows the left   and middle outlets in the center nozzle to  be opened and closed infinitely  
separately from the right outlet which is controll  ed in the same manner by the dial on the right.  
The air exit direction can be adjust  ed upward, downward, to the left, right or center with three separately  
adjustable sets of louvers.  
Cooled/heated air exits from the center nozzle (1).  
Fig. 11: Identifying Center Nozzle
 
 
2001 Mercedes-Benz ML320 
1998-2005 HVAC Climate Control - 163 Chassis  
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CENTER NOZZLE, LOCA TION - GF83.10-P-2107-02GH
The center nozzle (1) is located above the  center console in the instrument panel.  
Fig. 12: Identifying Center Nozzle
 
SIDE NOZZLE, FUNCTI  ON - GF83.10-P-2108-01GH 
Function   
The side nozzle (3) can be adjusted infinitely   or opened and closed completely with the dial.  
The air exit direction can be adjusted   upward, downward, to the left, to the right or middle as desired with the  
louver system.  
Heated/cooled air exits th  rough the side nozzle (3).  
Fig. 13: Identifying Side Nozzle
 
SIDE NOZZLE, LOCATI  ON - GF83.10-P-2108-02GH
 
2001 Mercedes-Benz ML320 
1998-2005 HVAC Climate Control - 163 Chassis  
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The side nozzles (3) are located at the outside left and right in the instrument panel. 
Fig. 14: Identifying Side Nozzle
 
FRONT FOOTWELL AIR VENT FUNCTION - GF83.10-P-2109-01GC 
Function up to 31.08.01  
The air supply to the front footwell air vents can be opened and closed via the air distribution switch using a 
cable. 
There is no separate adjusting facility. Temperature-controlled air comes out of the front footwell air vents. 
Function as of 1.09.01  
The air supply to the front footwell air vents can be opened and closed via the air distribution switch with the 
footwell flap actuator motor. 
There is no separate adjusting facility. Temperature-controlled air comes out of the front footwell air vents. 
FRONT FOOTWELL AIR OUTLET, LOCATION - GF83.10-P-2109-02GH 
The front footwell air outlet (4) (driver's side) is installed in the lower section of the instrument panel. 
The front footwell air outlet (passen
ger's side) is integrated into the heater/A/C housing. 
 
2001 Mercedes-Benz ML320 
1998-2005 HVAC Climate Control - 163 Chassis  
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Fig. 15: Identifying Fron t Footwell Air Outlet 
REAR FOOTWELL AIR VENT  FUNCTION - GF83.10-P-2110-01GC 
Function   
The air supply to the rear footwell air vent can be   opened and closed via the air distribution switch.  
There is no separate adjusting facili  ty. Temperature-controlled air comes  out of the rear footwell air vent. 
REAR FOOTWELL AIR VENT FUNCTION - GF83.10-P-2110-01GI 
The air supply to the rear footwell air vent can be ad justed by operating the rear compartment air distribution  
switch (  ) and the rear air distribution flap   actuator motor (M2/21) that it actuates.  
The quantity of air can be adjusted   by operating the blower button ( ) and th e rear blower motor (M2/1) that  
it actuates.  
Pressing the Auto button (  ) causes the automatic   air conditioning push-button control module to regulate  
the supply of air to the   rear footwell air vent and the air quantity.  
Temperature-controlled air comes out   of the rear footwell air vent. 
REAR FOOTWELL AIR VENT LOCATION - GF83.10-P-2110-02GH 
The rear footwell air vent (three vent s) is integrated in the rear footwell air duct (5) and is beneath the center 
 
2001 Mercedes-Benz ML320 
1998-2005 HVAC Climate Control - 163 Chassis  
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        Page 3264 of 4133
console.  
Fig. 16: Identifying Re ar Footwell Air Vent
 
REAR NOZZLE  FUNCTION - GF83.10-P-2111-01GI 
Function   
The air flow direction of the rear   nozzle (1) can be directed up, down, le ft or right as required using two  
individually-adjustable sl  atted shutters (2, 3).  
The air distribution between the rear   compartment and the rear footwell ca n be adjusted by operating the rear  
compartment air distribution switch ( ) and the rear   air distribution flap actuator motor (M2/21) that it  
actuates.  
The quantity of air can be adjusted   by operating the blower button ( ) and th e rear blower motor (M2/1) that  
it actuates.  
Operating the Auto button (  ) causes the AAC pus  h-button control module (N22) to regulate the air  
distribution and air quantit
y. 
 
2001 Mercedes-Benz ML320 
1998-2005 HVAC Climate Control - 163 Chassis  
me  
Saturday, October 02, 2010 3:23:15 PMPage 20 © 2006 Mitchell Repair Information Company, LLC.