Mercedes-Benz ML320. Service manual - part 683

 

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Mercedes-Benz ML320. Service manual - part 683

 

 

  Auto button, location/purpose/function

Rear ventilation operating module

2147GI 
GF83.40-P-
2147GJ

  AC OFF button, location/purpose/function

 

GF83.40-P-
2107GI

 

Residual heat button, 
location/purpose/function

 

GF83.40-P-
2148GI

 

Rear compartment air distribution button, 
location/purpose/function

 

GF83.40-P-
2173GI

 

All-activity module, 
location/purpose/function

 

GF54.21-P-
4110GH
 

 

Air conditioner housing, location/purpose/ 
design/function

 

GF83.40-P-
2105GI

  Auxiliary fan, location/purpose/function

Engine 111.977, 112.942, 112.970 
with code 580 up to 31.08.01 
Engine 112.942, 112.970 with code 
580a as of 01.09.01

GF83.40-P-
2162GH

 

Engine and AC electric suction fan with 
integrated control, location/purpose/function

Engine 113.942 with code 580a up to 
31.08.01 Engine 113.981, 113.965, 
612.963, 628.963, with code 580a as of 
01.09.01

GF83.40-P-
2172GI

  Condenser, location/purpose/function

 

GF83.40-P-
2152GC

  Evaporator location/purpose/design/function  

GF83.40-P-
2121GC

  Fluid reservoir, location/purpose/function

 

GF83.40-P-
2153GI

 

Expansion valve, location/purpose/design/ 
function

 

GF83.40-P-
2123GC

 

Refrigerant pressure and temperature sensor, 
location/purpose/function

 

GF83.40-P-
2171GI

 

Refrigerant compressor, location/purpose/ 
design/function

 

GF83.55-P-
2100P

  Control valve, location/purpose/function

 

GF83.55-P-
2102P

  Belt pulley, location/purpose/design/function  

GF83.55-P-
2103P

 

Pressure relief valve, 
location/purpose/function

 

GF83.55-P-
2104P

 

In-car temperature sensor location/purpose/ 
function

 

GF83.57-P-
2115GI

 

Ice-up protection temperature sensor, 
location/ purpose/function

 

GF83.57-P-
2113GH

  Blending air flap actuator, location/purpose/   

GF83.57-P-

 

2001 Mercedes-Benz ML320 

1998-2005 HVAC Climate Control - 163 Chassis

  

me 

 

REFRIGERANT COMPRESSOR, LOCATION - GF83.55-P-2100-01GH 

Illustrated up to 31.08.01  

The refrigerant compressor (A9) is flanged to the engine at front left 

Fig. 98: Identifying Refrigerant Compressor 

REFRIGERANT COMPRESSOR, FUNCTION - GF83.55-P-2100-02A 

function

2112GI

 

Ambient air temperature sensor, location/ 
purpose/function

 

GF83.57-P-
2119GI

 

Outlet air temperature sensor, center nozzle, 
location/purpose/function

 

GF83.57-P-
2116GI

 

Outlet air temperature sensor, front footwell, 
location/purpose/function

 

GF83.57-P-
2117GI

 

Outlet air temperature sensor rear, location/ 
purpose/function

 

GF83.57-P-
2118GI

  Sun sensor, location/purpose/function

 

GF83.57-P-
2111GI

 

Electric heater booster, location/purpose/ 
design/function

Engine 612.963

GF83.70-P-
4054GH

 

Extended activity module, location/purpose/ 
design

 

GF54.21-P-
4107GK
 

 

CDI control module, 
location/purpose/function

 

GF07.16-P-
3102IA

 

Table of contents, automatic air conditioning 
(AAC) function description

 

GF83.40-P-
0999GI

 

2001 Mercedes-Benz ML320 

1998-2005 HVAC Climate Control - 163 Chassis

  

me 

 

Refrigerant compressor 7SB16C  

Fig. 99: Identifying Refrigerant Compressor 7SB16C Components 

Function  

After the electromagnetic clutch (A9k1) has produced the frictional connection between the automotive engine 
and the refrigerant compressor, the drive shaft (1) drives the swash plate (3). The rotation of the inclined swash 
plate (3) causes the pistons (4) to move in strokes. During the intake stroke, refrigerant vapor is sucked in via 
the inlet valve (6). 

If the piston (4) moves in the counter direction, it delivers the refrigerant vapor via the pressure control valve 
(7), with the vapor being compressed and heating up, into the refrigerant line to the capacitor. With refrigerant 
compressor, model 7SB16C, the refrigerant vapor acts on the control valve (8.1) in the refrigerant compressor 
for volume control. 

Volume control in model 7SB16C  

With a low engine speed, the efficiency of an air conditioning system is severely reduced by the low number of 
working strokes of the refrigerant compressor and the reduced cooling of the refrigerant in the capacitor. In this 
situation there is an increase in the thermal load. The refrigerant compressor is therefore designed so that it has 
a sufficient delivery rate even at low rotational speeds. 

With an increase in the engine speed and the vehicle speed, the thermal load drops and the delivery rate of the 
refrigerant compressor increases. To prevent the refrigerant compressor now from consuming unnecessary 
engine power and nevertheless to maintain the refrigeration cycle, the refrigerant compressor reduces its power 

 

2001 Mercedes-Benz ML320 

1998-2005 HVAC Climate Control - 163 Chassis

  

me 

 

from a maximum of 100 % to a minimum of 5 %.

Fig. 100: Identifying Refrigerant Compressor, Function - (1 Of 2) 

Function  

100% power (I)  

The conditions for full power are either a constantly low rotational speed or a high thermal load or both. The 
high manifold air pressure C causes the control valve to close. This prevents steam from flowing between the 
rear opening and the crankcase. There is always some flow through the transfer duct between the crankcase and 
the inlet opening. Therefore, in the crankcase there is almost the same pressure B as on the inlet side C . As a 
result, the swash plate is moved into the position for maximum volume. The angle between the swash plate and 
the vertical is at its greatest. This results in a large stroke. 

Power from 100% to 5% output ( II)  

If the influencing conditions change in that the thermal load drops or the engine speed increases, the pressure on 
the inlet side C drops and allows the control valve to open. 

Then compressed refrigerant now flows from the rear opening to the crankcase. The pressure in the crankcase B
increases therefore and causes the swash plate to reduce its angle, which leads to a reduction in power.

 

2001 Mercedes-Benz ML320 

1998-2005 HVAC Climate Control - 163 Chassis

  

me 

 

 

 

 

 

 

 

 

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