Mercedes-Benz ML320. Service manual - part 674

 

  Index      Mercedes     Mercedes-Benz ML320 - service and repair manual 1997-2005 year

 

Search            copyright infringement  

 

 

 

 

 

 

 



 

 

Content   ..  672  673  674  675   ..

 

 

Mercedes-Benz ML320. Service manual - part 674

 

 

AUTOMATIC AIR CONDITIONING PUSH-BUTTON CONTROL MODULE, FUNCTION - GF83.40-P-2000GI 

MODEL 163 as of 1.9.01 with CODE (580a) Automatic air conditioning  

Fig. 69: Identifying Blower Switch, Temperature Selector Wheel, Air Distribution Switch And Interior 
Air Temperature Sensor
 

Function  

The AAC push-button control module (N22) makes it possible to make adjustments coming from the driver 
such as: 

air quantity, by adjusting the blower switch setting (1)  

temperature by setting the temperature selector wheel (2)  

air distribution, by setting the air distribution switch (3)  

defrost function by pressing the defroster button (

 )  

recirculated air mode by pressing the recirculated air push-button (

 )  

automatic air distribution/blower speed by pressing the Auto  

switching off the cooling by pressing the AC button (

 )  

activating the residual engine heat utilization system with the ignition switched off by pressing the REST 
button (

 )  

heating the rear window by pressing the rear window heating button (

 )  

switching off the air distribution to the rear compartment by pressing the rear compartment air 
distribution button (

 )  

612.963

2005GH

  Residual engine heat utilization system, function

 

GF83.75-P-
2000GI

 

Automatic air conditioning system component summary, 
location/purpose/design/function

 

GF83.40-P-
9990GI

 

2001 Mercedes-Benz ML320 

1998-2005 HVAC Climate Control - 163 Chassis

  

me 

 

The control module integrated in the AAC push-button control module (N22) looks after all system regulation 
and control functions such as: 

comparing preselected and actual temperatures and controlling the air temperature at the air outlets  

automatic switchover from fresh air to recirculated air mode  

electrical control of refrigerant compressor  

controlling the auxiliary fan or the electric suction-type fan motor/ air conditioning with integrated 
control  

The AAC push-button control module (N22) has a diagnostic capability. Consequently, any faults which occur 
are stored in the fault memory which can be read with the help of the diagnosis assistant system (DAS). 

When the AAC push-button control module is replaced (N22), variant coding must be carried out using the 
Diagnosis Assistant System (DAS). 

The AAC push-button control module (N22) also performs the following actuations:  

direct: refrigerant compressor; heating water circulation pump; PTC heater booster (OM 612 only), rear 
window heater  

via the CAN BUS: auxiliary fan, electric suction-type fan motor/air conditioning with integrated control, 
blower control and air distribution in the rear compartment (automatic mode)  

via the AC bus: blower motor; 8 stepping motors for air distribution  

The following sensor signals are read in by the AAC push-button control module (N22):  

direct: temperature sensor evaporator, pressure and temperature sensor refrigerant, in-car temperature 
sensor, center nozzle vent air temperature sensor, footwell and rear passenger compartment, sun sensor  

via the CAN BUS: Ambient temperature display temperature sensor, sensor for specified values in rear 
control panel  

REFRIGERANT CIRCUIT FUNCTION - GF83.40-P-2001GH 

MODEL 163 up to 31.8.01 with CODE (580) Air conditioning or Tempmatic for USA  

  Blower switch, location/task/design/function

  GF83.25-P-2100GI

  Temperature selector wheel, location/task/ design/function

  GF83.25-P-2102GI

  Air distribution switch, location/task/design/ function

  GF83.25-P-2101GI

  Defroster button, location/task/function

  GF83.40-P-2139GI

  Recirculating air push-button, location/task/ function

  GF83.40-P-2145GI

  Auto button, location/task/function

  GF83.40-P-2147GI

  AC OFF button, location/task/function

  GF83.40-P-2107GI

  Rest push-button, location/task/function

  GF83.40-P-2148GI

  Rear passenger compartment air distribution button, location/task/function

  GF83.40-P-2173GI

 

2001 Mercedes-Benz ML320 

1998-2005 HVAC Climate Control - 163 Chassis

  

me 

 

Fig. 70: Identifying Refrigerant Circuit Function (Model 163 Up To 31.8.01 With Code (580) Air 
Conditioning Or Tempmatic For USA)
 

The refrigerant compressor (1) driven by motor compresses the gaseous refrigerant, which is thereby heated up 
and routed to the condenser (2). 

The condenser's (2) surface withdraws the refrigerant's compression heat. When cooling down the refrigerant 
liquefies. 

When flowing through the fluid reservoir (3) the refrigerant is purified of any chemicals and mechanical 
impurities and the water in the refrigerant is separated and collected. 

The expansion valve (4) injects the cooled down and liquefied refrigerant in the evaporator (5), which is located 
in the fresh air flow. Here the refrigerant is vaporized. This vaporization process then withdraws heat from the 
blow-by fresh air which comes in from outside over the pipe and monolith systems with the result that it cools 
down. 

The humidity carried along with it is converted to condensed water which is routed to the outside. The air is 
dried. 

The refrigerant compressor (1) draws in the refrigerant which has turned gaseous on account of the heat 
absorption and compresses it again. 

When the engine is running and the blower switched on, the passenger compartment can have cool air supplied 
to it by various outlet nozzles. The intensity of the cooling process depends on the previously set in-car 
temperature and the blower output. 

 

2001 Mercedes-Benz ML320 

1998-2005 HVAC Climate Control - 163 Chassis

  

me 

 

REFRIGERANT CIRCUIT, FUNCTION - GF83.40-P-2001GI 

MODEL 163 as of 1.9.01 with code (580a) Automatic air conditioning

  Auxiliary fan, location/task/function

 Engines 111.977, 112.942

GF83.40-P-
2162GH

 

Electric fan motor/air conditioning, 
location/task/function

 Engines 113.942/981 and 

612.963

GF83.40-P-
2151GH

  Condenser position/task/function

 

GF83.40-P-
2152GC

  Evaporator, location/purpose/design/function

 

GF83.40-P-
2121GC

  Fluid reservoir (TAC), location/task/function

 

GF83.30-P-
2120GC

  Expansion valve, location/task/design/function

 

GF83.40-P-
2123GC

  Refrigerant pressure sensor, location/task/ function  

GF83.40-P-
2156GH

 

Refrigerant compressor, location/task/design/ 
function

 

GF83.55-P-
2100GH

 

Air conditioning control module, location/task/ 
function

 

GF83.30-P-
2102GH

  All-activity module, location/task/design/ function

 

GF54.21-P-
4110GH
 

  Extended-activity module, position/task

 

GF54.21-P-
4106GH
 

  Extended-activity module, location/task/design

as of 1.12.99

GF54.21-P-
4107GK
 

  CDI control module, location/task/function

 Engine 612.963

GF07.16-P-
3102IA

 

2001 Mercedes-Benz ML320 

1998-2005 HVAC Climate Control - 163 Chassis

  

me 

 

 

 

 

 

 

 

 

Content   ..  672  673  674  675   ..