Mercedes-Benz ML320. Service manual - part 673

 

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Mercedes-Benz ML320. Service manual - part 673

 

 

  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/function

ENGINE 111.977, 112.942

GF83.40-P-
2162GH

 

Electric fan motor/air conditioning system, 
location/purpose/function

Engine 113.942, 113.981 and 
612.963, 628.963

GF83.40-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 

 

AUTOMATIC AIR CONDITIONING (AAC), FUNCTION - GF83.40-P-0001GI 

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

Function  

The automatic air conditioning (AAC) is equipped with an electronically regulated cooling, heating and 
ventilating system and can be summed up by the following list of subfunctions. 

Ventilation 

The ventilation ensures that there is a sufficient supply of air within the passenger compartment. 
Ventilation is achieved with the support of the blower during normal operation, when vehicle is standing 
or to increase the air flow. The air is distributed in the passenger compartment using air distribution flaps.

Automatic air conditioning temperature control 

The desired temperature is reached or held constant by cooling or heating the air. Precise temperature 
control can be achieved by reading in the various temperature sensors. 

Residual engine heat utilization 

 

Electromagnetic clutch, location/purpose/ 
design/function

 

GF83.55-P-
2101GH

  In-car temperature sensor, location/purpose/ function

with intake jet nozzle up to 
30.11.99

GF83.57-P-
2115GH

 

In-car temperature sensor with ventilation blower, 
location/purpose/function

as of 1.12.99

GF83.57-P-
2107GH

 

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

 

GF83.57-P-
2113GH

  Blending air flap actuator, location/purpose/ function

 

GF83.57-P-
2112GC

  Outside temperature sensor, location/purpose/ function

as of 1.12.99

GF83.57-P-
2110GH

 

Electric heater booster, location/purpose/ 
design/function

Engines 612.963 and 628.963

GF83.70-P-
4054GH

 

Temperature regulator microswitch, location/ 
purpose/function

Engine 612.963

GF83.70-P-
4055GH

  Extended activity module, location/purpose

 

GF54.21-P-
4106GH
 

  Extended activity module, location/purpose/ design

as of 1.12.99

GF54.21-P-
4107GK
 

  CDI control module, location/purpose/function

Engine 612.963

GF07.16-P-
3102IA

 

2001 Mercedes-Benz ML320 

1998-2005 HVAC Climate Control - 163 Chassis

  

me 

 

The residual engine heat utilization system allows the vehicle to be heated even when the ignition is 
switched
 OFF. To do so the system utilizes the residual heat from the engine and guides it via the 
blower into the passenger compartment. The heating water circulation pump ensures that the 
coolant is properly circulated.
  

Automatic air conditioning push-button control module 

The automatic air conditioning can be operated by the driver using various tip switches. Apart from this 
the push-button control module reads in different sensor signals, processes them and controls components 
in the automatic air conditioning. 

Rear ventilation control panel 

The operator can intervene in the automatic regulation of the rear ventilation through the automatic air 
conditioning by using the rear ventilation control panel and adjust it accordingly to suit needs at any 
given time. With the aid of the air distribution switch and blower switch the operator can accommodate 
his/her own wishes. The correspondingly altered function is then no longer regulated by the automatic air 
conditioning. 

By pressing the automatic control button the manually initiated settings can be reset and thus regulated 
again by the automatic air conditioning. 

Regulation of the air quantity and air distribution ensues thus solely by way of the automatic air 
conditioning push-button control module. 

Heater circuit  

Coolant is heated by the engine. Subsequently, the heated coolant is then routed through the heat exchanger, 
where the heat is dissipated to the air in the passenger compartment. The heater return line, in which the heating 
water circulation pump is located, takes the coolant back to the coolant pump. 

The heating water circulation pump ensures that the coolant is properly circulated. 

The coolant flows through the heat exchanger permanently. 

Depending upon the desired in-car temperature, regulation is conducted over the blending air flaps, which are 
operated by the blending air flap actuator motor. 

Heater operation with heater booster in vehicles with OM 612.963  

In vehicles equipped with direct-injection diesel engines, an electrical heater booster is additionally installed in 
the evaporator housing downstream of the heat exchanger, in order to compensate the heater output deficit 
which occurs in the case of certain operating conditions. 

The 3 heating elements in the heater booster are supplied with current, as a result of which they are heated and 
start to glow. As a result of the structural conditions, it is ensured that the drawn in fresh air flows directly past 
the electric heater booster, and is therefore heated.

 

2001 Mercedes-Benz ML320 

1998-2005 HVAC Climate Control - 163 Chassis

  

me 

 

Refrigerant circuit  

The refrigerant compressor serves to compresses the gaseous refrigerant which heats up during the process, is 
then routed into the condenser and thus cooled down. After purification in the fluid reservoir the liquid 
refrigerant is injected into the evaporator. The refrigerant is vaporized and cools down. The refrigerant 
compressor intakes the refrigerant again which has turned gaseous through the heat absorption process. 

TABLE OF CONTENTS, AUTOMATIC AIR CONDITIONING (AAC) FUNCTION DESCRIPTION - GF83.40-P-0999GI 

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

  Ventilation, function

  GF83.10-P-2000GI

  Heater circuit function

  GF83.20-P-2003GH

  Automatic air conditioning push-button control module, function

  GF83.40-P-2000GI

  Rear ventilation control panel, function

  GF83.40-P-2007GI

  Refrigerant circuit function

  GF83.40-P-2001GI

  Temperature control, function

  GF83.57-P-2000GI

  Heater booster (ZUH), function

  GF83.70-P-0005GH

  Residual engine heat utilization system, function

  GF83.75-P-2000GI

  Automatic air conditioning (AAC), function

 

GF83.40-P-
0001GI

  Ventilation system function

 

GF83.10-P-
2000GI

  Heater circuit function

 

GF83.20-P-
2003GH

  Automatic air conditioning push-button control module, function

 

GF83.40-P-
2000GI

  Rear ventilation control panel, function

 

GF83.40-P-
2007GI

  Refrigerant circuit function

 

GF83.40-P-
2001GI

  Temperature control, function

 

GF83.57-P-
2000GI

  Heater booster (ZUH), function

 Engine 

612.963

GF83.70-P-
0005GH

  Start heater operation, function

 Engine 

612.963

GF83.70-P-
2000GH

  End heater operation, function

 Engine 

612.963

GF83.70-P-
2002GH

  Regulate heater operation, function

 Engine 

612.963

GF83.70-P-
2004GH

  Cancel heater operation, function

 Engine 

GF83.70-P-

 

2001 Mercedes-Benz ML320 

1998-2005 HVAC Climate Control - 163 Chassis

  

me 

 

 

 

 

 

 

 

 

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