Mercedes-Benz ML320. Service manual - part 670

 

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Mercedes-Benz ML320. Service manual - part 670

 

 

AC CONTROL MODULE LOCATION/TASK/FUNCTION - GF83.30-P-2102GH

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

AC BUTTON, FUNCTION - GF83.30-P-2103-01GH 

Function  

Pressing the AC button (

 ) switches on the cooling mode. 

AC button (

 ) pressed 

Diode is illuminated, cooling mode/air dehumidification, refrigerant compressor ON 

AC button (

 ) not depressed 

Diode not illuminated, no air dehumidification/no cooling mode, refrigerant compressor OFF  

The AC button (

 ) is connected to the A/C control module, which regulates the refrigerant compressor 

through the all-activity module. The refrigerant compressor is only active when the engine is running and the 
blower switched on. To be able to determine the cut-in point for the electromagnetic coupling on the refrigerant 
compressor, the all-activity module must receive additional data from the CAN bus, such as, e.g. the engine 
speed. 

AC BUTTON, LOCATION - GF83.30-P-2103-02GH 

The AC button (

 ) is located in the air conditioning control module (S98).

 

Air conditioning 
control module, 
location

 

GF83.30-P-
2102-02GH

 

Air conditioning 
control module, 
task

Control of air conditioning 

Recording input signals of various components  

Internal processing of input signals  

Sending of control signals to various components  

 

 

Air conditioning 
control module, 
function

The AC control module records the input signals of various 
components, in order to check the preconditions for proper and intended 
operation. It sends control signals to the following components: 
Blending air flap actuator motor, fresh air/recirculated air flap actuator 
motor, All-activity module. 
The air conditioning (tempmatic) control module (TAC) receives input 
data from the following devices: AC button, in-car temperature sensor, 
temperature selector wheel, blower switch, icing protection temperature 
switch, blending air flap position signal.

 

 

2001 Mercedes-Benz ML320 

1998-2005 HVAC Climate Control - 163 Chassis

  

me 

 

Fig. 58: Identifying AC Button On Air Conditioning Control Module 

AC BUTTON, LOCATION/TASK/FUNCTION - GF83.30-P-2103GH 

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

EVAPORATOR HOUSING, POSITION - GF83.30-P-2104-01GH 

The evaporator housing (1) is located below the instrument panel. 

Fig. 59: Identifying Evaporator Housing 

EVAPORATOR HOUSING, FUNCTION - GF83.30-P-2104-02GH 

 

AC button, 
location

 

GF83.30-P-2103-
02GH

  AC button, task

The AC button is used to switch the air conditioning system on 
and off.

 

 

AC button, 
function

 

GF83.30-P-2103-
01GH

 

2001 Mercedes-Benz ML320 

1998-2005 HVAC Climate Control - 163 Chassis

  

me 

 

Operating condition: Air ducting in heating mode

Fig. 60: Identifying Evaporator Housing Function - Operating Condition Air Ducting In Heating Mode 

Operating condition: HEATING Function  

In the heating operating status, the fresh air (A) is drawn in by the blower (5) into the evaporator housing and 
routed through the dust filter (3). The air purified by the dust filter (3) is then routed through the evaporator (2) 
and dried there. The fresh air (B), which has been dried, cooled and cleaned, is subsequently routed through the 
heat exchanger (1). This air conduction is controlled via the setting of the blending air flaps (6). 

The fresh air (B), which has been dried, cooled and cleaned, is heated up again in the heat exchanger (1). The 
warm air (C) is conducted via the air outlets (E, F, M and S) into the vehicle interior. The recirculated air flap 
(4) is closed. 

Operating condition: Air ducting in cooling mode

 

2001 Mercedes-Benz ML320 

1998-2005 HVAC Climate Control - 163 Chassis

  

me 

 

Fig. 61: Identifying Evaporator Housing Function - Operating Condition Air Ducting In Cooling Mode) 

Operating condition: cooling Function  

In the cooling operating status, the fresh air (A) is drawn in by the blower (5) into the evaporator housing and 
routed through the dust filter (3). The air purified by the dust filter (3) is then routed through the evaporator (2) 
and dried there. The fresh air (B), which has been dried, cooled and cleaned, is subsequently routed around the 
heat exchanger (1). This air conduction is controlled via the setting of the blending air flaps (6). 

The dried, cooled and cleaned air (B) is routed directly into the passenger compartment via the air outlets (E, F, 
M and S). The recirculated air flap (4) is closed. 

Operating condition: Blend air ducting (warm/cold) closed-loop operation

 

2001 Mercedes-Benz ML320 

1998-2005 HVAC Climate Control - 163 Chassis

  

me 

 

 

 

 

 

 

 

 

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