instrument panel MERCEDES-BENZ ML500 1997 Complete Repair Manual

HEATER HOUSING POSITION/TASK/FUNCTION - GF83.20-P-2110GC
MODEL 163 up to 31.8.01
168 up to except CODE (580) Air conditioning or Tempmatic for USA
Shown on model 168 as of 1.03.01
Fig. 42: Identifying Heater Housing
- Shown On Model 168 As Of 1.03.01
FRESH AIR/RECIRCULATED AIR FLAP, LOCATION/PURPOSE/FUNCTION - GF83.20-P-2111GC
MODEL 163, 168

Heating water
circulation pump
function
GF83.20-P-
2102-01GI
Heater housing
positionThe heater housing (1) is located beneath the instrument
panel.
Model 168 up to 28.02.01GF83.20-P-2103-
01GC
Model 163GF83.20-P-2103-
01GH
Heater housing task GF83.20-P-2103-
03GC
Heater housing
functionModel 168GF83.20-P-2103-
02GC
Model 163GF83.20-P-2103-
02GH

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:15 PMPage 52 © 2006 Mitchell Repair Information Company, LLC.

Fig. 58: Identifying AC Button On Air Conditioning Control Module
AC BUTTON, LOCATION/TASK/FUNCTION - GF83.30-P-2103GH
MODEL 163 up to 31.8.01 with CODE (580) Air conditioning or Tempmatic for USA
EVAPORATOR HOUSING, POSITION - GF83.30-P-2104-01GH
The evaporator housing (1) is located below the instrument panel.
Fig. 59: Identifying Evaporator Housing

EVAPORATOR HOUSING, FUNCTION - GF83.30-P-2104-02GH
AC button,
location GF83.30-P-2103-
02GH
AC button, taskThe AC button is used to switch the air conditioning system on
and off.
AC button,
function GF83.30-P-2103-
01GH

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:15 PMPage 68 © 2006 Mitchell Repair Information Company, LLC.

Blending air flap actuator
Fresh air/recirculated air flap actuator
Defroster vent flap actuator motor
Rear shutoff flap actuator motor
Footwell flap actuator
Electric heater booster (for engine 612.963 only) and therefore forms a complete unit.
AIR CONDITIONER HOUSING, LOCATION / TASK / DESIGN / FUNCTION - GF83.40-P-2105GI
MODEL 163 as of 1.9.01 with code (580a) Automatic air conditioning
Fig. 77: Identifying Automatic Air Conditioning Box


Automatic air
conditioning box,
locationThe Automatic air conditioning box (1) is below the instrument
panel.

Automatic air
conditioning box,
purposeThe automatic air conditioning box distributes the air that is
required to ventilate the vehicle to the relevant air ducts and vents
depending on the interior temperature that is required.


Automatic air
conditioning box,
design
GF83.40-P-
2105-04GI
Automatic air
conditioning box with engine 112, 113GF83.40-P-

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:16 PMPage 95 © 2006 Mitchell Repair Information Company, LLC.

The in-car temperature sensor (B10/4) is equipped with an aspirator blower which constantly draws air out of
the vehicle interior for the temperature measurement when the ignition is ON . The in-car temperature sensor
(B10/4) records the interior temperature and conveys it to the AAC push-button control module. A comparison
is made there with the setting on the temperature selector and the blend air flap is repositioned depending on the
result of this comparison.
It is connected to the AAC push-button control module via a separate electric cable.
Constant circulation of the interior air at the in-car temperature sensor (B10/4) is achieved by the in-car
temperature sensor aspirator blower (M9) and therefore ensures a high level of control accuracy.
In contrast to the previous suction jet nozzle a high level of control accuracy is ensured by the in-car
temperature sensor aspirator blower (M9).
OUTSIDE AIR TEMPERATURE SENSOR FUNCTION - GF83.57-P-2103-01GH
Function
The resistance of the outside air temperature sensor (B10/5) depends on the ambient temperature and the ground
speed. With an increase in the outside temperature, its resistance decreases. This information is sent to the air
conditioning control module (N19). This information causes a slight lowering or raising of the temperature
selected at the air conditioning control panel.
This achieves an adaptation to the temperature perception of the occupants.
The outside temperature depends on the ground speed, which prevents a value for the outside temperature that is
too high - as may occur when the vehicle is stationary or when traveling slowly, e.g. due to thermal radiation
from the engine - from being sent to the air conditioning control module (N19).
The value of the ground speed is sent from the traction systems control module (N47) via the instrument cluster
(A1) to the air conditioning control module (N19).
When switching the ignition off and on and with speeds lower than 20 km/h the temperature measured last is
used.
OUTSIDE AIR TEMPERATURE SENSOR POSITION - GF83.57-P-2103-02GH
The outside air temperature sensor (B10/5) is located at the front on the air inlet of the evaporator housing.

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:17 PMPage 141 © 2006 Mitchell Repair Information Company, LLC.

SUN SENSOR POSITION/TASK/FUNCTION - GF83.57-P-2111GI
MODEL 163 as of 1.9.01 with CODE (580a) Automatic air conditioning
Fig. 122: Identifying Sun Sensor

BLENDING AIR FLAP ACTUATOR MOTOR, LOCATION/TASK/FUNCTION - GF83.57-P-2112GC
MODEL 163 up to 31.8.01, 168 with code (580) Air conditioning or Tempmatic for USA
Outside temperature
sensor, taskThe outside temperature sensor (B10/5) records all the outside
temperature and sends it to the air conditioning control module
(N19).

Outside temperature
sensor function GF83.57-P-
2103-01GH
Sun sensor,
locationThe sun sensor (B32) is located behind the instrument cluster in the instrument panel.
Sun sensor,
taskThe sun sensor (B32) measures the intensity and direction of the solar radiation.
Sun sensor,
functionThe sun sensor (B32) records the intensity and angle of incidence of the solar radiation
onto the vehicle. This makes it possible, dependent on the solar radiation intensity
(brightness) the in-car temperature and the blower speed to be automatically adjusted.

Blending air flap GF83.57-P-

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:17 PMPage 145 © 2006 Mitchell Repair Information Company, LLC.

Fig. 126: Identifying Center Nozzle Vent Air Temperature Sensor
FRONT FOOTWELL VENT AIR TEMPERATURE SENSOR, LOCATION/TASK/FUNCTION - GF83.57-P-2117GI
MODEL 163 as of 1.9.01 with CODE (580a) Automatic air conditioning

Center nozzle vent air
temperature sensor,
locationThe center nozzle vent air temperature sensor (B10/24) is located to the left of
the air duct's center nozzle below the instrument panel.

Center nozzle vent air
temperature sensor,
taskThe center nozzle vent air temperature sensor (B10/24) records the temperature
of the air flowing out of the center nozzle and sends it to the AAC push-button
control module (N22).


Center nozzle vent air
temperature sensor,
functionThe vent air's recorded temperature value is compared by the AAC push-button
control module (N22) with the setting in the temperature selector wheel
whereupon it authorizes a corresponding adjustment to the blending air flap to
be made depending upon the result.


2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:17 PMPage 149 © 2006 Mitchell Repair Information Company, LLC.

Fig. 127: Identifying Front Footwell Vent Air Temperature Sensor
REAR AIR STREAM TEMPERATURE SENSOR, LOCATION/TASK/FUNCTION - GF83.57-P-2118GI
MODEL 163 as of 1.9.01 with CODE (580a) Automatic air conditioning

Front footwell vent air
temperature sensor,
locationThe front footwell vent air temperature sensor (B10/25) is located to the left of
the automatic air conditioning box below the instrument panel.

Front footwell vent air
temperature sensor,
taskThe front footwell vent air temperature sensor (B10/25) records the temperature
of the air flowing in the front footwell and sends it to the AAC push-button
control module (N22).


Front footwell vent air
temperature sensor,
functionThe vent air's recorded temperature value is compared by the AAC push-button
control module (N22) with the setting in the temperature selector wheel and
authorizes a corresponding adjustment to the blending air flap to be made
depending upon the result.


2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:17 PMPage 150 © 2006 Mitchell Repair Information Company, LLC.

Fig. 150: Identifying Switch Unit For Heater/Ventilation Components
REMOVE AND INSTALL HEAT EXCHANGER FROM HEATER HOUSING - AR83.20-P-3400GH
MODEL 163

Remove/install
1Remove radio AR82.60-P-
7502EA
2Remove center part of instrument panel (1) AR68.10-P-
1030GH
3Unscrew bolts at heater/AC controls (4) and
remove controls
4Detach cable (2, 3) Unclip cables at
heater/AC controls.
5Disconnect connector (X72/3) at heater/AC
controls (4)
6Install in the reverse order

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:18 PMPage 180 © 2006 Mitchell Repair Information Company, LLC.

Fig. 153: Identifying Series Resistor For Heater Blower Components (Shown On Model 163 Up To VIN
A289564, X754619)
REMOVE/INSTALL COVER AT AIR INTAKE - AR83.25-P-1405GH
MODEL 163.113 /128 /136 /154 /157 /172 /174 /175

Remove/install
1Remove cover below instrument panel (2) (on right)Up to VIN A145272,
X708318.AR68.10-P-
1520GH
As of VINA145273,
X708319.AR68.10-P-
1520GI
2Disconnect connector (4) on blower motor series
resistor group (R14)
3Unscrew screws (3) from blower motor series
resistor group (R14) on heater housing (1)
4Remove blower motor series resistor group (R14)
5Install in the reverse order

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:18 PMPage 183 © 2006 Mitchell Repair Information Company, LLC.

Fig. 158: Identifying Components Of Defroster Vent Flap Actuator Motor For Windshield
REMOVE/INSTALL FOOTWELL FLAP ACTUATOR MOTOR - AR83.30-P-2007GH

Remove/install
1Remove cover below instrument
panel (left) AR68.10-P-
1500GH
2.1Remove electronic transmission
control (ETC) control module Only on models fitted with automatic
transmission.AR27.19-P-
1719GH
3
Disconnect interior and taillamp
wiring harness connector, cockpit
(X18)from bracket(1)

4Remove screws (2)
5Move bracket (1) downwards and
put to one side
6Disconnect plug (3)
7
Remove screws (4) on defroster vent
flap actuator motor (M2/8) from
heater housing

8Remove defroster vent flap actuator
motor (M2/8) Installation:Adjust defroster vent flap
actuator motor (M2/8) to the 0 position
using STAR DIAGNOSIS.

9Install in the reverse order

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:18 PMPage 190 © 2006 Mitchell Repair Information Company, LLC.