Mercedes-Benz ML320. Service manual - part 685

 

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Mercedes-Benz ML320. Service manual - part 685

 

 

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  

Fig. 105: Identifying Refrigerant Compressor - Shown On Model 203 

ELECTROMAGNETIC CLUTCH, FUNCTION - GF83.55-P-2101-01A 

Electromagnetic clutch (A9k1)  

 

Refrigerant compressor, 
position

The refrigerant compressor (A9) is flange-mounted to the 
left front of the engine.

 

   

Model 163

GF83.55-P-2100-
01GH

 

Refrigerant compressor, 
task

The refrigerant compressor (A9) is responsible for induction 
and compression of the refrigerant.

 

 

Refrigerant compressor, 
design

 

GF83.55-P-2100-
03P

 

Refrigerant compressor, 
function

 

GF83.55-P-2100-
02P

 

2001 Mercedes-Benz ML320 

1998-2005 HVAC Climate Control - 163 Chassis

  

me 

 

Fig. 106: Identifying Electromagnetic Clutch (A9K1) Components 

Function  

In order to start operating the refrigerant compressor, the push-button control module (N19, N22) actuates the 
electromagnetic clutch (A9k1) and the solenoid (5) is supplied with electrical current. The magnetic force 
attracts the pressure plate (6) against the rubber insert (7) and holds it securely. This creates the frictional 
connection between the automotive engine and the refrigerant compressor. If the solenoid (5) is de-energized, 
then the pressure plate (6) is pressed back by the rubber insert (7) into its rest position and the frictional 
connection is interrupted. 

Safety shutoff of the refrigerant compressor  

To prevent a mechanical defect in the refrigerant compressor from causing the poly V-belt to jump loose, the 
electromagnetic clutch releases itself automatically. With a mechanical defect, the refrigerant compressor 
rotates more sluggishly or even locks completely. The heat generated at the friction surface causes the melting 
fuse (2) in the solenoid (5) to melt. The current supply to the solenoid (5) is interrupted and the frictional 
connection is released. 

ELECTROMAGNETIC CLUTCH, LOCATION - GF83.55-P-2101-02GH 

The electromagnetic clutch (A9k1) is located on the drive shaft of the refrigerant compressor (A9) at the front 
left in the engine compartment. 

 

2001 Mercedes-Benz ML320 

1998-2005 HVAC Climate Control - 163 Chassis

  

me 

 

Fig. 107: Identifying Electromagnetic Clutch 

ELECTROMAGNETIC CLUTCH, DESIGN - GF83.55-P-2101-03GH 

The belt pulley (1) mounted on the drive shaft (4) of the refrigerant compressor is driven by the poly V-belt. It 
rotates on the ball bearing (3), around the solenoid (5) attached on the refrigerant compressor housing. The 
pressure plate (6) with the rubber insert (7) is connected via splining (8) to the drive shaft (4) of the refrigerant 
compressor and is axially displaceable thereon. 

Fig. 108: Identifying Electromagnetic Clutch (A9K1) Components

 

2001 Mercedes-Benz ML320 

1998-2005 HVAC Climate Control - 163 Chassis

  

me 

 

ELECTROMAGNETIC CLUTCH POSITION/TASK/DESIGN/FUNCTION - GF83.55-P-2101GH 

ENGINES 111.977, 112.942, 113.942/981, 612.963 in MODEL 163 up to 31.08.01 with CODE (580) Air 
conditioning or Tempmatic for USA
  

Electromagnetic clutch (A9k1)  

Fig. 109: Identifying Electromagnetic Clutch (A9K1) Components 

REFRIGERANT COMPRESSOR CONTROL VALVE, FUNCTION - GF83.55-P-2102-02P 

 

Electromagnetic clutch, 
location

 

GF83.55-P-
2101-02GH

 

Electromagnetic clutch, 
task

Switching the frictional connection between the 
automotive engine and the refrigerant compressor  

Switching off the refrigerant compressor with a 
mechanical defect.  

 

 

Electromagnetic clutch, 
design

 

GF83.55-P-
2101-03GH

 

Electromagnetic clutch, 
function

 

GF83.55-P-
2101-01A

 

2001 Mercedes-Benz ML320 

1998-2005 HVAC Climate Control - 163 Chassis

  

me 

 

 

 

 

 

 

 

 

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