MERCEDES-BENZ ML350 1997 Complete Repair Manual

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
me
Saturday, October 02, 2010 3:23:14 PMPage 17 © 2006 Mitchell Repair Information Company, LLC.

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
me
Saturday, October 02, 2010 3:23:15 PMPage 18 © 2006 Mitchell Repair Information Company, LLC.

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
me
Saturday, October 02, 2010 3:23:15 PMPage 19 © 2006 Mitchell Repair Information Company, LLC.

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.

Fig. 17: Identifying Rear No zzle And Two Individually-Adjustable Slatted Shutters
RECIRCULATING AIR SWITCH FUNCTION - GF83.10-P-2117-01GH
Function
Pressing the recirculating air switch ( ) actuates the fresh air/recircul ating air flap actuator motor (M39),
which opens the recirculating air flap using a mechanic al operating mechanism and simultaneously closes the
fresh air supply.
If the manual recirculating air system is active the diode illuminates in the recirculating air switch ( ).
RECIRCULATING AIR SWITCH LOCATION - GF83.10-P-2117-02GH
The recirculating air switch ( ) is in the heater control unit (S98).

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:15 PMPage 21 © 2006 Mitchell Repair Information Company, LLC.

Fig. 18: Identifying Recirculating Air Switch
RECIRCULATING AIR SWITCH LOCATION/TASK/DESIGN/FUNCTION - GF83.10-P-2117GH
MODEL 163 up to 31.8.01
SERIES RESISTOR GROUP, POSITION - GF83.10-P-2124-01GH
The series resistor group (R14) is at the bottom right of the heater/ evaporator housing (1) behind the bottom
section of the instrument panel at the passenger side (2).
Fig. 19: Identifying Series Resistor Group

SERIES RESISTOR ASSEMBLY FUNCTION - GF83.10-P-2124-02GH
Function
Recirculating air switch
location GF83.10-P-2117-
02GH
Recirculating air switch,
taskThe recirculating air switch ( ) is used to operate the
fresh air/recirculating air flap.
Recirculating air switch,
designThe recirculating air switch ( ) is equipped with an LED
as a malfunction indicator lamp.
Recirculating air switch
function GF83.10-P-2117-
01GH

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:15 PMPage 22 © 2006 Mitchell Repair Information Company, LLC.

The series resistor assembly (R14) is comprised of three resistors which can be interconnected, via series
connection, to form an overall resistor. Depending on the setting of the blower switch, current is guided via the
resistors assigned to the set blower level to the blower (M2). Different control voltages are therefore present at
the blower (M2), as a result of which the blower (M2) operates at different rotational speeds.
COMBINATION FILTER, LOCATION/TASK/DESIGN/FUNCTION - GF83.10-P-2128GI
MODEL 163 as of 1.9.01 with CODE (580a) Automatic air conditioning
Fig. 20: Identifying Combination Filter

FOOTWELL FLAP ACTUATOR MOTOR, FUNCTION - GF83.10-P-2132-02GI
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
Combination
filter locationThe combination filter (1) is at the bottom of the automatic air conditioning box.
Combination
filter taskThe combination filter (1) removes impurities and odors from the air flowing through
the automatic air conditioning box. Fresh air and recirculating air are filtered.
Combination
filter designThe combination filter (1) consists of fleece and a large number of so-called sliver
absorbers that are evenly distributed over an air-permeable carrier mat.
Combination
filter function
The combination filter (1) filters over 80% of particles from 0.3 in size and up to
100% of 0.5 u sized particles and pollen. The sliver adsorbers also continuously
absorb odors and pollutants and release them again in extremely small concentrations
after a certain time.


2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:15 PMPage 23 © 2006 Mitchell Repair Information Company, LLC.

Function
Rotating the air distribution switch in the AAC push-button control module (N22) actuates the footwell flap
actuator motor via the AC bus. The footwell flap actuator motor (M2/21) controls the footwell flap, which
adopts the following positions according to requirements.
Switching logic
footwell flap closed = 0%
footwell flap open = 100%
Automatic footwell flap control (Auto button engaged)
The footwell flap is opened depending on the following values
blending air flap setting
Coolant temperature
Evaporator temperature
linear up to 100 % open.
Footwell flap control via push-button control module
(Clock type switch setting of air distribution switch)
If a problem exists, it is possible to retrieve and verify the defined end positions by means of the diagnosis
assistant system (DAS) (valuation trip).
After replacing an actuator motor an adjustment run must be performed via the Diagnosis Assistant System
(DAS), i.e. the flap OPEN and SHUT limit positions are defined and retained.
FOOTWELL FLAP ACTUATOR MOTOR, LOCATION / TASK / FUNCTION - GF83.10-P-2132GI
MODEL 163 as of 1.9.01 with CODE (580a) Automatic air conditioning
1 o'clock 2 o'clock 3 o'clock 4 o'clock 5 o'clock6 o'clock
17% 32% 50% 68% 85%
100%
7 o'clock 8 o'clock 9 o'clock 10 o'clock 11 o'clock
12 o'clock
66% 31%
0%
%0%0%
NOTE: All actuator motors are identical.

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:15 PMPage 24 © 2006 Mitchell Repair Information Company, LLC.

Fig. 21: Identifying Footwell Flap Actuator Motor
AIR INLET, LOCATION/FUNCTION - GF83.10-P-2138GC
MODEL 163, 168
AIR DUCTS, LOCATION/TASK/DESIGN - GF83.10-P-2139GH
MODEL 163
Footwell flap actuator
motor, locationThe footwell flap actuator motor (M2/15) is on the left on the
automatic air conditioning box.
Footwell flap actuator
motor, taskThe footwell flap actuator motor operates the footwell flap for
regulating the air flow to the front footwell.
Footwell flap actuator
motor, function GF83.10-P-
2132-02GI
Air inlet, locationModel 168GF83.10-P-2100-01GC
Model 163
GF83.10-P-2100-01GH
Air inlet, functionThe fresh air required for
ventilation flows through
the air inlet to the
heater/air conditioning
housing.

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:15 PMPage 25 © 2006 Mitchell Repair Information Company, LLC.

Design shown up to 31.08.01
Fig. 22: Identifying Air Ducts
- Design Shown Up To 31.08.01
BLOWER REGULATOR, LOCATION / TASK / FUNCTION - GF83.10-P-2141GI
MODEL 163 as of 1.9.01 with CODE (580a) Automatic air conditioning
Air duct
locationsup to 31.08.01GF83.10-P-
2101-01GH
as of 1.09.01GF83.10-P-
2101-01GI
Air ducts
taskThe air ducts (1-5) lead the air that is required to ventilate the vehicle
from the heater/ evaporator housing to the air vents in the vehicle
interior.


2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:15 PMPage 26 © 2006 Mitchell Repair Information Company, LLC.