Mercedes-Benz ML320. Manual — part 663
Defrost function
Defroster nozzle flap open 100 %.
System switched off
Defroster nozzle flap open 100 % (This limp-home capability ensures that the windshield will not fog up even
when a malfunction has occurred)
Defroster nozzle flap control via the 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 replacement of an actuator motor it is necessary for an adjustment run to be performed using the diagnosis
assistant system (DAS), i.e. the end positions flap OPEN and SHUT are defined and retained.
DEFROSTER VENT FLAP ACTUATOR MOTOR, LOCATION/TASK/FUNCTION - GF83.10-P-2175GI
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'clock
6 o'clock
85%
68%
50%
32%
17%
0%
7 o'clock
8 o'clock
9 o'clock
10 o'clock
11 o'clock
12 o'clock
0 %
0 %
0 %
32 %
70 %
100 %
NOTE:
All actuators are identical.
2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Fig. 31: Identifying Defroster Vent Flap Actuator Motor
ELECTRONIC BLOWER CONTROL UNIT, REAR VENTILATION, FUNCTION - GF83.10-P-2176-01GI
Function
The blower push-button (
) in the rear ventilation control panel (N72/2s3) is used to send a control voltage
to the rear electronic blower regulator (N29/2). Depending on the control voltage (0 - 6 V) present, this then
regulates the operating voltage (0 -12 V) for the rear blower motor (M2/1). This facilitates blower speed control
of 0-100%.
Automatic operation, function
By pressing the Auto button (
) in the rear ventilation control panel the control of the rear electronic blower
regulator and thus that of the rear blower motor is governed by the AAC push-button control module.
Defroster vent flap
actuator motor,
location
The defroster vent flap actuator motor (M2/8) is located at the left
side of the air conditioner housing.
Defroster vent flap
actuator motor, task
The defroster vent flap actuator motor (M2/8) operates the
defroster vent flaps for air flow control to the windshield defroster
vent and side window defroster vents.
Defroster vent flap
actuator motor,
function
GF83.10-P-
2175-01GI
2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
REAR ELECTRONIC BLOWER REGULATOR, LOCATION/TASK/FUNCTION - GF83.10-P-2176GI
Model 163 as of 1.9.01 with code (580a) Automatic air conditioning
Fig. 32: Identifying Rear Electronic Blower Regulator
HEATER FUNCTION - GF83.20-P-0002GH
MODEL 163 up to 31.8.01
Function
The heater enables a pleasant interior climate for the vehicle passengers in the event of different weather
conditions.
A nominal temperature is preset at the heater push-button control module temperature selector wheel. This
setting is transmitted to the blending air flaps in the heater housing via a cable and an actuation mechanism.
Rear electronic blower
regulator, location
The rear electronic blower regulator (N29/2) is located behind
the rear nozzle below the center console.
Rear electronic blower
regulator, task
The rear electronic blower regulator (N29/2) controls the rear
blower motor (M2/1) voltage supply depending on the relevant
blower level setting.
Rear electronic blower
regulator, function
GF83.10-P-
2176-01GI
2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Control is then carried out there as follows:
Temperature selector wheel MAX setting (full heater output)
Due to the setting of the blending air flaps, the drawn in air is routed through the heat exchanger. Heated
cooling water generally flows through this, as a result of which the passing air is heated. The temperature-
controlled air is guided into the vehicle interior via the various air outlets.
Temperature selector wheel MIN setting (no heater output)
In this setting, the blending air flaps block the route to the heat exchanger. The drawn in fresh air is guided
directly to the air outlets and therefore into the vehicle interior.
HEATER FUNCTIONAL DESCRIPTION TABLE OF CONTENTS - GF83.20-P-0998GH
MODEL 163 up to 31.8.01 except CODE (580) Air conditioning or Tempmatic for USA
Ventilation system function
GF83.10-P-2000GH
Heater circuit function
GF83.20-P-2003GH
Heater controls, function
GF83.20-P-2004GH
Heater function
GF83.20-P-0002GH
Ventilation system function
GF83.10-P-2000GH
Heater circuit function
GF83.20-P-2003GH
Heater controls, function
GF83.20-P-2004GH
Air inlet, location/function
GF83.10-P-2138GC
Air ducts, location/task/design
GF83.10-P-2139GH
Blower, location/task/design/function
GF83.10-P-2102GC
Series resistor group, location/task/function
GF83.10-P-2161GC
Dust filter, location/task/function
GF83.10-P-2142GH
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
Front footwell air outlet, location/task/function
GF83.10-P-2145GC
Rear footwell air outlet, location/task/function
GF83.10-P-2146GC
Heating system heat exchanger, location/ purpose/function
GF83.20-P-2108GC
Fresh air/recirculated air flap, location/task/ function
GF83.20-P-2111GC
Fresh air/recirculated air flap actuator, location/ task/function
GF83.30-P-2116GC
Blower switch, location/task/design/function
GF83.25-P-2100GC
Air distribution switch, location/task/design/ function
GF83.25-P-2101GH
Temperature selector wheel, location/task/ design/function
GF83.25-P-2102GC
Air recirculation switch, location/task/design/ function
GF83.10-P-2117GH
2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
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