1997 MERCEDES-BENZ ML320 air condition

In automatic mode the air quantity and the air distribution are controlled depending on the status of the
automatic air conditioning.
AIR INLET, LOCATION - GF83.10-P-2100-01GH
The air inlet (1) is located at the bottom of the windshield.
Air inlet, location/function GF83.10-P-2138GC
Air ducts, location/task/design GF83.10-P-2139GH
Rear vent, location/task/function GF83.10-P-2143GC
Defroster vent, location/task/function GF83.10-P-2144GC
Center nozzle, location/task/function GF83.10-P-2149GC
Lateral nozzle, location/task/function GF83.10-P-2150GC
Rear nozzle position/task//function GF83.10-P-2151GI
Front footwell air outlet, location/task/function GF83.10-P-2145GC
Rear footwell air outlet, location/task/function GF83.10-P-2146GI
Blower motor, position/task//function GF83.10-P-2170GI
Rear blower motor, position/task/design/function GF83.10-P-2168GI
Blower regulator, location / task / function GF83.10-P-2141GI
Rear ventilation electronic blower regulator location/task/function GF83.10-P-2176GI
Combination filter, location/task/function GF83.10-P-2128GI
Defroster vent flap actuator motor, location/task/ function GF83.10-P-2175GI
Footwell flap actuator motor, location / task / function GF83.10-P-2132GI
Center outlet flap actuator motor, location / task / function GF83.10-P-2172GI
Rear shutoff flap actuator motor, location / task / function GF83.10-P-2171GI
Rear air distribution flap actuator motor, location / task / function GF83.10-P-2173GI
Fresh air/recirculation flap, location / task / function GF83.20-P-2111GC
Fresh air/recirculation flap actuator motor, location / task / function GF83.30-P-2116GC
Blending air flap actuator motor, location / task / function GF83.57-P-2112GI
Blower switch, location/task/design/function GF83.25-P-2100GI
Air distribution switch, location/task/design/ function GF83.25-P-2101GI
Recirculating air push-button, location/task/ function GF83.40-P-2145GI
Air conditioner housing, location / task / design / function GF83.40-P-2105GI

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:14 PMPage 9 © 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.

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.

REAR FOOTWELL AIR OUTLET, LOCATION/TASK/FUNCTION - GF83.10-P-2146GI
MODEL 163 as of 1.9.01 with CODE (580a) Automatic air conditioning
Fig. 24: Identifying Left And Right Rear Compartment Air Vent

CENTER NOZZLE, LOCATION/PURPOSE/FUNCTION - GF83.10-P-2149GC
MODEL 163, 168
Rear footwell air vent taskThe rear footwell air vent is used to ventilate the rear
footwell.
Rear footwell air vent
function GF83.10-P-2110-
01GC
Rear footwell air vent
locationThe left and right rear footwell air vents (1,2) are below the
passenger and driver's seats.
Rear footwell air vent
taskThe left and right rear footwell air vents (1,2) are used to
ventilate the rear footwell.
Rear footwell air vent
function GF83.10-P-2110-
01GI
Center nozzle,
locationModel 168GF83.10-P-
2107-02GC
GF83.10-P-

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:15 PMPage 29 © 2006 Mitchell Repair Information Company, LLC.

SIDE NOZZLE, LOCATION/PURPOSE/FUNCTION - GF83.10-P-2150GC
MODEL 163, 168
REAR COMPARTMENT NOZZLE LOCATION/TASK/FUNCTION - GF83.10-P-2151GI
MODEL 163 as of 1.9.01 with CODE (580a) Automatic air conditioning
Model 1632107-02GH
Center nozzle,
purposeThe center nozzle serves for specific guidance and distribution of the
air in the upper section of the front vehicle passenger compartment.
Center nozzle,
functionModel 168GF83.10-P-
2107-01GC
Model 163GF83.10-P-
2107-01GH
Side nozzle,
locationModel 168GF83.10-P-
2108-02GC
Model 163GF83.10-P-
2108-02GH
Side nozzle,
purposeThe left and right side nozzles serve for specific guidance and
distribution of the air in the passenger compartment on the driver and
passenger sides.

Side nozzle,
functionModel 168GF83.10-P-
2108-01GC
Model 163GF83.10-P-
2108-01GH

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:15 PMPage 30 © 2006 Mitchell Repair Information Company, LLC.