1997 MERCEDES-BENZ ML320 Complete Repair Manual

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Page 3385 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual 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

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.

Page 3386 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual Fig. 119: Identifying Outsid e Air Temperature Sensor
BLENDING AIR ACTUATOR, LOCATION - GF83.57-P-2105-01GH
The blending air flap actuator motor (M16/8) is located at the top in the center on the

Page 3387 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual The mechanical flaps are regulated by a linkage to the blending air flap actuator motor (M16/8). The flaps open
or close the passage of air through the heating system heat exchanger in order to mix h

The mechanical flaps are regulated by a linkage to the blending air flap actuator motor (M16/8). The flaps open
or close the passage of air through the heating system heat exchanger in order to mix heated air with cooled air
in the correct proportion necessary to achieve the desired in-car temperature.
The set point flap angle of the blending air flaps is determined by the air conditioning control module as a
function of the following information:
set point temperature selected at the temperature selector wheel
in-car temperature measured at the in-car temperature sensor (B10/4)
BLENDING AIR FLAP MOTOR FUNCTION - GF83.57-P-2105-02GI
Function
The blending air flap actuator motor (M2/6) is actuated via the AC bus and as a function of the position of the
temperature selector wheel in the AAC push-button control module (N22) and the actual in-car temperature.
The mechanical flaps are regulated by a linkage to the blending air flap actuator motor (M2/6). The flaps open
or close the passage of air through the heating system heat exchanger in order to mix heated air with cooled air
in the correct proportion necessary to achieve the desired in-car temperature.
The set point flap angle of the blending air flaps is determined by the AAC push-button control module (N22)
as a function of the following information:
set point temperature selected at the temperature selector wheel
in-car temperature measured at the in-car temperature sensor (N22b1)
temperatures of the air stream measured at the center nozzle air stream temperature sensors, footwell
forward and rear (B10/24, B10/25 and B10/7)
outside temperature measured by the outside temperature indicator temperature sensor (B14)
All actuators are identical.
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 an actuator motor has been replaced, an adjustment run must be performed via the Diagnosis Assistant
System (DAS), i.e. the end positions flap OPEN and SHUT are defined and retained.
ICING PROTECTION TEMPERATURE SENSOR, LOCATION - GF83.57-P-2106-01GH
The icing protection temperature sensor (R35) is located at the center rear of the evaporator housing.

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:17 PMPage 143 © 2006 Mitchell Repair Information Company, LLC.

Page 3388 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual Fig. 121: Identifying Icing Protection Temperature Sensor
ICING PROTECTION TEMPERATURE SENSOR, FUNCTION - GF83.57-P-2106-02GH
Function
The icing protection temperature sensor (R35) is located in t

Page 3389 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual 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

Page 3390 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual BLENDING AIR FLAP ACTUATOR MOTOR, LOCATION/TASK/FUNCTION - GF83.57-P-2112GI
MODEL 163 as of 1.9.01 with CODE (580a) Automatic air conditioning
Fig. 123: Identifying Blending Air Flap Actuator Motor

Page 3391 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual MODEL 163 up to 31.8.01 with CODE (580) Air conditioning or Tempmatic for USA
MODEL 163 as of 1.9.01 with CODE (580a) Automatic air conditioning
IN-CAR TEMPERATURE SENSOR, LOCATION - GF83.57-P-211

Page 3392 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual IN-CAR TEMPERATURE SENSOR, LOCATION/TASK/FUNCTION - GF83.57-P-2115GH
MODEL 163 up to 30.11.99 with CODE (580) Air conditioning or Tempmatic for USA with suction jet
nozzle
IN-CAR TEMPERATURE SENSOR

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