Mercedes-Benz ML320. Service manual - part 687

 

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Mercedes-Benz ML320. Service manual - part 687

 

 

Fig. 115: Identifying Belt Pulley, Design 

BELT PULLEY, LOCATION/TASK/DESIGN/FUNCTION - GF83.55-P-2103P 

ENGINE 111, 112, 113, 271, 272, 611, 612, 642, 646 in MODEL 203.0 /2 with CODE (580) Air 
conditioning (or Tempmatic for USA) with CODE (580) Automatic air conditioning with CODE (581) 
Automatic air conditioning with CODE (581) Comfort automatic air conditioning
  

ENGINE 111, 112, 271, 272, 611, 612, 646 in MODEL 203.7 with CODE (580) Air conditioning (or 
Tempmatic for USA) with CODE (580) Automatic air conditioning with CODE (581) Automatic air 
conditioning with CODE (581) Comfort automatic air conditioning
  

ENGINE 112.942 /970, 113.942 /965 /981, 612.963, 628.963 in MODEL 163 as of 1.9.01 with CODE (580) 
Automatic air conditioning
  

ENGINE 112, 113, 271, 272, 273, 612, 642, 646 in MODEL 209.3  

ENGINE 112, 113, 271, 272, 273, 642 in MODEL 209.4  

Shown on model 203  

 

2001 Mercedes-Benz ML320 

1998-2005 HVAC Climate Control - 163 Chassis

  

me 

 

Fig. 116: Identifying Belt Pulley And Refrigerant Compressor - Shown On Model 203 

PRESSURE RELIEF VALVE, FUNCTION - GF83.55-P-2104-02P 

The pressure relief valve is a pressure sensitive wax valve. It is used when all other pressure-dependent safety 
devices cannot prevent a pressure rise in the refrigerant compressor (A9). 

The wax can withstand a pressure of approx. 35 bar. If the pressure increases to above this value, the wax fuse 
is destroyed and pressure is released through the created opening. 

PRESSURE RELIEF VALVE, LOCATION / TASK / FUNCTION - GF83.55-P-2104P 

ENGINE 111, 112, 113, 271, 272, 611, 612, 642, 646 in MODEL 203.0 /2 with CODE (580) Air 
conditioning (or Tempmatic for USA) with CODE (580) Automatic air conditioning with CODE (581) 
Automatic air conditioning with CODE (581) Comfort automatic air conditioning
  

ENGINE 111, 112, 271, 272, 611, 612, 646 in MODEL 203.7 with CODE (580) Air conditioning (or 
Tempmatic for USA) with CODE (580) Automatic air conditioning with CODE (581) Automatic air 
conditioning with CODE (581) Comfort automatic air conditioning
  

ENGINE 112.942 /970, 113.942 /965 /981, 612.963, 628.963 in MODEL 163 as of 1.9.01 with CODE (580) 
Automatic air conditioning
  

ENGINE 112, 113, 271, 272, 273, 612, 642, 646 in MODEL 209.3  

ENGINE 112, 113, 271, 272, 273, 642 in MODEL 209.4

 

Belt pulley, 
position

The belt pulley (2) is located on the front of the drive shaft on the 
refrigerant compressor (A9).

 

 

Belt pulley, 
task

The belt pulley (2) drives the refrigerant compressor (A9). In addition 
the pulley (2) is also used as a torque damper and a torque limiter.

 

 

Belt pulley, 
design

 

GF83.55-P-
2103-03P

 

Belt pulley, 
function

 

GF83.55-P-
2103-02P

 

2001 Mercedes-Benz ML320 

1998-2005 HVAC Climate Control - 163 Chassis

  

me 

 

Shown on model 203  

Fig. 117: Identifying Pressure Relief Valve And Refrigerant Compressor - Shown On Model 203 

TEMPERATURE CONTROL, FUNCTION - GF83.57-P-2000GH 

MODEL 163 up to 31.08.01 with CODE (580) Air conditioning or Tempmatic for USA  

Function  

The temperature preselected at the temperature selector wheels is reached or kept constant by: 

heating up by the heat exchanger,  

heating up by the electric heater booster (with engine 612.963 only)  

cooling by the evaporator core,  

cooling and reheating (reheat mode).  

Heating up  

The heating system heat exchanger heats the air passing by, which is then conducted into the vehicle interior by 
the air ducts. 

Heating up by the electric heater booster  

Due to the high level of efficiency of the direct-injection diesel engine, the heat output of the coolant is not 
sufficient to heat the fresh air. By installing the electric heater booster, behind the heating system heat 
exchanger, this heating capacity deficit is compensated.

 

Pressure relief 
valve, position

The pressure relief valve (3) is located on the refrigerant 
compressor (A9).

 

 

Pressure relief 
valve, task

The pressure relief valve (3) serves to protect the refrigerant 
circuit from damage caused by excess pressure.

 

 

Pressure relief 
valve, function

 

GF83.55-P-
2104-02P

 

2001 Mercedes-Benz ML320 

1998-2005 HVAC Climate Control - 163 Chassis

  

me 

 

Cooling down  

The thermostatic expansion valve located on the evaporator core serves to expand the liquid refrigerant which is 
under high pressure thus lowering its pressure. After this the refrigerant evaporates. The evaporation heat 
required for this is taken from the air flowing through the evaporator. The resulting cooled down air then 
succeeds in entering the passenger compartment via the air ducts. 

Reheat mode  

The air which has been cooled down and dehumidified by the evaporator core is heated up again by the heat 
exchanger (reheat). This serves to prevent the windows from misting up on the inside. 

 

Temperature selector wheel, location/task/ 
design/function

 

GF83.25-P-
2102GC

 

Heating system heat exchanger, location/ 
purpose/function

 

GF83.20-P-
2108GC

  Evaporator, location/purpose/design/function

 

GF83.40-P-
2121GC

  Expansion valve, location/task/design/function

 

GF83.40-P-
2123GC

  Refrigerant compressor, location/task/design/ function

 

GF83.55-P-
2100GH

  In-car temperature sensor, location/task/function

with suction jet nozzle up to 
30.11.99

GF83.57-P-
2115GH

 

In-car temperature sensor with ventilation fan, 
location/task/function

as of 01.12.99

GF83.57-P-
2107GH

 

Defroster protection temperature sensor, 
location/task/function

 

GF83.57-P-
2113GH

  Blending air flap actuator, location / task / function

 

GF83.57-P-
2112GC

  Outside temperature sensor, location/task/ function

as of 01.12.99

GF83.57-P-
2110GH

  Air conditioning control module, location/task/ function  

GF83.30-P-
2102GH

  All Activity Module, location/task/function

 

GF54.21-P-
4110GH
 

  Electric heater booster position/task/design/ function

 Engine 612.963

GF83.70-P-
4054GH

 

Temperature regulator microswitch, location/ 
task/function

 Engine 612.963

GF83.70-P-
4055GH

  Extended activity module, position/task

 

GF54.21-P-
4106GH
 

  Extended Activity Module, location/task/design

as of 1.12.99

GF54.21-P-
4107GK
 

 

2001 Mercedes-Benz ML320 

1998-2005 HVAC Climate Control - 163 Chassis

  

me 

 

 

 

 

 

 

 

 

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