1997 MERCEDES-BENZ ML320 engine

Compartment As Of 12/99
Location of components in engine compartment
Fig. 53: Identifying Air Conditioning Components
- Location Of Components In Engine Compartment
Location of components, refrigeration technology part up to 11/99

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:15 PMPage 63 © 2006 Mitchell Repair Information Company, LLC.

TABLE OF CONTENTS, AIR CONDITIONING (TAC) FUNCTION DESCRIPTION - GF83.30-P-0999GH
MODEL 163 up to 31.8.01 with code (580) Air conditioning or Tempmatic for USA
AIR CONDITIONING CONTROL MODULE FUNCTION - GF83.30-P-2001GH
MODEL 163 up to 31.8.01 with CODE (580) Air conditioning or Tempmatic for USA
The following components are integrated into the air conditioning control module (S98):
Blower switch (1): with 0 setting and 4 levels.
The blower switch (1) is not available as an individual part.
Temperature selector wheel (2): with the "Blue", non-heating setting and the continuously variable heater
setting.
When set to the indented position "blue" 100 % recirculated air is provided.
Air distribution switch (3): with the settings: Defroster vents, footwell, center plane and intermediate settings.
Recirculation switch ( ) : 100 % recirculation without time limit, when diode illuminates.
AC button ( ): Diode illuminates,
Refrigerant compressor ON cooling mode/air dehumidification Diode is not illuminated, refrigerant compressor
OFF no air dehumidification/coolin
g mode
Air conditioning (TAC) function GF83.30-P-0001GH
Ventilation system function GF83.10-P-2000GH
Heater circuit function GF83.20-P-2003GH
Air conditioning control unit function GF83.30-P-2001GH
Refrigerant circuit function GF83.40-P-2001GH
Temperature control, function GF83.57-P-2000GH
Heater booster, functionEngine 612.963GF83.70-P-0005GH
Starting heater operation, functionEngine 612.963GF83.70-P-2000GH
Terminate heater operation functionEngine 612.963GF83.70-P-2002GH
Regulate heater operation, functionEngine 612.963GF83.70-P-2004GH
Cancel heater operation, functionEngine 612.963GF83.70-P-2005GH
Air conditioning, location of components GF83.30-P-0003-01GH

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:15 PMPage 65 © 2006 Mitchell Repair Information Company, LLC.

AC CONTROL MODULE LOCATION/TASK/FUNCTION - GF83.30-P-2102GH
MODEL 163 up to 31.8.01 with CODE (580) Air conditioning or Tempmatic for USA
AC BUTTON, FUNCTION - GF83.30-P-2103-01GH
Function
Pressing the AC button ( ) switches on the cooling mode.
AC button ( ) pressed
Diode is illuminated, cooling mode/air dehumidification, refrigerant compressor ON
AC button ( ) not depressed
Diode not illuminated, no air dehumidification/no cooling mode, refrigerant compressor OFF
The AC button ( ) is connected to the A/C control module, which regulates the refrigerant compressor
through the all-activity module. The refrigerant compressor is only active when the engine is running and the
blower switched on. To be able to determine the cut-in point for the electromagnetic coupling on the refrigerant
compressor, the all-activity module must receive additional data from the CAN bus, such as, e.g. the engine
speed.
AC BUTTON, LOCATION - GF83.30-P-2103-02GH
The AC button ( ) is located in the air conditioning control module (S98).

Air conditioning
control module,
location
GF83.30-P-
2102-02GH

Air conditioning
control module,
task
Control of air conditioning
Recording input signals of various components
Internal processing of input signals
Sending of control signals to various components


Air conditioning
control module,
function
The AC control module records the input signals of various
components, in order to check the preconditions for proper and intended
operation. It sends control signals to the following components:
Blending air flap actuator motor, fresh air/recirculated air flap actuator
motor, All-activity module.
The air conditioning (tempmatic) control module (TAC) receives input
data from the following devices: AC button, in-car temperature sensor,
temperature selector wheel, blower switch, icing protection temperature
switch, blending air flap position signal.


2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:15 PMPage 67 © 2006 Mitchell Repair Information Company, LLC.

Blending air flap actuator
Recirculated air flap actuator motor
Electric heater booster (for engine 612.963 only) and therefore forms a complete unit.
The evaporator housing distributes the air that is required to ventilate the vehicle to the relevant air ducts and
vents depending on the required interior temperature.
The air ducting depends on various operating conditions such as:
Heating mode
Cooling mode
Blend air mode (cold/warm)
Cooling air mode with recirculated air
FRESH AIR/RECIRCULATED AIR FLAP ACTUATOR MOTOR, POSITION - GF83.30-P-2105-01GC
The fresh air/recirculated air flap actuator motor (M16/7) is located on the A/C housing between the two fresh
air/recirculated air flaps.
Fig. 64: Identifying Fresh Air/Recirculated Air Flap Actuator Motor

FRESH AIR/RECIRCULATED AIR FLAP ACTUATOR MOTOR, POSITION - GF83.30-P-2105-01GH
The fresh air/recirculated air flap actuator motor (M39) is located at the side of the air intake housing on the
evaporator housin
g.

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:15 PMPage 73 © 2006 Mitchell Repair Information Company, LLC.

Control of fresh air/recirculated air flap via the AAC push-button control module (N22)
When the recirculating air push-button is pressed ( ) on the AAC push-button control module the system is
switched by means of the fresh air/recirculated air flap actuator motor straight to 100 % recirculation air. This is
displayed by the function LED.
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.
AIR CONDITIONING FLUID RESERVOIR, LOCATION - GF83.30-P-2106-01GH
The fluid reservoir (6) is located in the left front of the engine compartment, next to the condenser.
Fig. 66: Identifying Air Conditioning Fluid Reservoir And Associated Components

AIR CONDITIONING FLUID RESERVOIR, FUNCTION - GF83.30-P-2106-02GC
Function
NOTE: The recirculated air function can be terminated after a set time-out in
accordance with country specifications.
NOTE: All actuators are identical.

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:15 PMPage 75 © 2006 Mitchell Repair Information Company, LLC.

The liquefied refrigerant is routed under pressure into the fluid reservoir and flows through a stainless steel
meshing to the filter block. The pores in the filter block are matched precisely to the refrigerant's molecular size.
Thus the refrigerant can flow through the filter block.
All other matter, primarily water, is held back by this molecular filter and deposited. The cleaned refrigerant
flows over a rising pipe to the expansion valve.
Whenever the system is opened, the fluid reservoir should be replaced because of the water which has
collected there in the meantime.
ALL-ACTIVITY MODULE, LOCATION - GF83.30-P-2108-02GH
The all-activity module (AAM) (N10) is located in the left-hand side of the engine compartment. It is plugged
on from below to the fuse and relay module (F1).
Fig. 67: Identifying All
-Activity Module And Relay Module
FRESH AIR/RECIRCULATED AIR FLAP ACTUATOR, LOCATION/TASK/FUNCTION - GF83.30-P-2116GC
MODELS 163 up to 31.8.01, 168 up to 28.2.01 with CODE (580) Air conditioning or Tempmatic for USA
MODEL 163 as of 1.9.01 with code (580a) Automatic air conditioning
Shown on model 163 as of 1.09.01

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:15 PMPage 76 © 2006 Mitchell Repair Information Company, LLC.

AIR CONDITIONING FLUID RESERVOIR, LOCATION/TASK/FUNCTION - GF83.30-P-2120GC
MODELS 163 up to 31.8.01
168 up to with code (580) Air conditioning or Tempmatic for USA
OVERVIEW OF AIR CONDITIONING (TAC) SYSTEM COMPONENTS, LOCATION/PURPOSE/DESIGN/FUNCTION -
GF83.30-P-9999GI
MODEL 163 up to 31.8.01 with CODE (580a) Automatic air conditioning
Evaporator housing, task 04GH
Evaporator housing,
function GF83.30-P-2104-
02GH
At maximum heating mode in vehicles with engine
612.963 onlyGF83.30-P-2104-
02GK
Fluid reservoir (TAC),
locationModel 168GF83.30-P-2106-
01GC
Model 163GF83.30-P-2106-
01GH
Fluid reservoir (TAC),
task
Filtering chemical and mechanical impurities out
of the refrigerant
Volume accumulator for refrigerant
Draining of refrigerant

Fluid reservoir (TAC),
function GF83.30-P-2106-
02GC
Air inlet, location/function GF83.10-P-
2138GC
Air ducts, location/purpose/design GF83.10-P-
2139GH
Blower, location/purpose/design/function GF83.10-P-
2102GC
Series resistor group, location/purpose/function GF83.10-P-
2161GC
Dust filter, location/purpose/function GF83.10-P-
2142GH
Rear vent, location/purpose/function GF83.10-P-
2143GC
Defroster vent, location/purpose/function GF83.10-P-
2144GC
Center nozzle, location/purpose/function GF83.10-P-
2149GC

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:15 PMPage 78 © 2006 Mitchell Repair Information Company, LLC.

Lateral nozzle, location/purpose/function GF83.10-P-
2150GC
Front footwell air outlet, location/purpose/ function GF83.10-P-
2145GC
Rear footwell air outlet, location/purpose/ function GF83.10-P-
2146GC
Heating system heat exchanger, location/
purpose/function GF83.20-P-
2108GC
Fresh air/recirculation flap, location/purpose/ function GF83.20-P-
2111GC
Fresh air/recirculation flap actuator, location/
purpose/function GF83.30-P-
2116GC
Blower switch, location/purpose/design/function GF83.25-P-
2100GC
Air distribution switch, location/purpose/design/
function GF83.25-P-
2101GH
Temperature selector wheel, location/purpose/
design/function GF83.25-P-
2102GC
Air recirculation switch, location/purpose/
design/function GF83.10-P-
2117GH
AC button, location/purpose/function GF83.30-P-
2103GH
AC control module, location/purpose/function GF83.30-P-
2102GH
All-activity module, location/purpose/function GF54.21-P-
4110GH
A/C housing, location/purpose/function GF83.30-P-
2119GH
Auxiliary fan, location/purpose/functionENGINE 111.977, 112.942GF83.40-P-
2162GH
Electric fan motor/air conditioning system,
location/purpose/functionEngine 113.942, 113.981 and
612.963, 628.963GF83.40-P-
2151GH
Condenser, location/purpose/function GF83.40-P-
2152GC
Evaporator location/purpose/design/function GF83.40-P-
2121GC
Fluid reservoir (TAC), location/purpose/function GF83.30-P-
2120GC
Expansion valve, location/purpose/design/ function GF83.40-P-
2123GC
Refrigerant pressure sensor, location/purpose/ function GF83.40-P-
2156GH
Refrigerant compressor, location/purpose/
design/function GF83.55-P-
2100GH

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:15 PMPage 79 © 2006 Mitchell Repair Information Company, LLC.