Mercedes-Benz ML320. Service manual - part 693

 

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Mercedes-Benz ML320. Service manual - part 693

 

 

Commercially available tools 

Parts ordering notes 

SELF-DIAGNOSTIC SYSTEM 

HEATER, DIAGNOSIS, CONTENTS - AD83.20-P-1000GHZ 

MODEL 163  

DIAGNOSIS TOOLS, HEATER - AD83.20-P-2000-01GC 

Commercially available tools 

 

 

 If the actual value changes, there are not faults 

present in the automatic air conditioning control 
unit. 
6 Perform further diagnosis and repair 
correspondingly.

 

 

 

 If actual value remains unchanged: ?

 

 

 

7 Remove/install/replace automatic air 
conditioning control unit.

AR83.40-P-
6500GH

 

 

8 Install components removed in opposite order.

 

 

 

9 Select "Control module adaptation" with STAR 
DIAGNOSIS under "Automatic air conditioning".

 

 

 

10 Select "Read coding and change if necessary".  

 

 

11 Adjust "National version" according to 
customer's request 

 Settings for blower and temperature: ? 

"Rest of the world". = Minimum 
"USA" = Standard 
"----" = Maximum

 

 

 

12 Adjust "LED dimming" according to "SERIES"  

 

 

13 Adjust further coding according to vehicle 
specifications.

 

Number

Designation

WH58.30-Z-1048-13A STAR DIAGNOSIS diagnosis system, Compact Passenger Car

6511 1801 00

Part no.

Designation

Quantity

163 820 49 89

Switch unit/automatic air conditioning control unit, ECE

1

163 820 50 89

Switch unit/automatic air conditioning control unit, USA

1

K 1.8 [] 11

Heater, diagnosis, basic knowledge

  AD83.20-P-2000GH

K 1.8 [] 12

Heater, diagnosis, function check

  AD83.20-P-3000GH

Number

Designation

 

2001 Mercedes-Benz ML320 

1998-2005 HVAC Climate Control - 163 Chassis

  

me 

 

HEATER, DIAGNOSIS, BASIC KNOWLEDGE - AD83.20-P-2000GH 

MODEL 163  

HEATER CAPACITY, FUNCTION CHECK, HEATER - AD83.20-P-3000-01GH 

Test sequence  

Heater switch (2) on "red" stop  

Blower switch (1) on stage 4  

Air distribution switch (3) in 12 o'clock position  

Recirculated air button (

 ) not pressed (LED does not come on)  

Test period > 5 minutes  

Engine speed 2000 rpm  

Engine coolant temperature > 80°C  

 Read out temperature measuring instrument (4) 

Temperature display > 55°C 

  

If the measured values stated above are not achieved, the following components and functions should be 
checked: 

Engine coolant temperature  

Furring in cooling system and heat exchanger  

Blend air flap function  

Coolant circulation pump (M13) 

WH58.30-Z-1002-08A

Digital temperature measuring instrument (measuring range -20° to +70°)

WH58.30-Z-1004-08A

Air temperature probe

  Electric wiring diagrams, location of ground points and connectors

  PE83.00-P-1100E

 

Connection and use of test equipment

  AD00.00-P-1000AZ 

 

Diagnosis tools, heater

  AD83.20-P-2000-01GC

 

2001 Mercedes-Benz ML320 

1998-2005 HVAC Climate Control - 163 Chassis

  

me 

 

Fig. 131: Identifying Heater Capacity, Function Check, Heater 

HEATER, DIAGNOSIS, FUNCTION CHECK - AD83.20-P-3000GH 

MODEL 163  

 

Heater, diagnosis, basic knowledge

 

AD83.20-P-2000GH

 

Check fuses F1/6, F1/41, F1/43

 

 

 

Allow engine to idle at operating 
temperature (approx. 80°C engine coolant 
temperature) throughout the entire test 
period

 

 

 

Outside temperature > 15°C

 

 

 

Open center and side air outlets manually

 

 

 

Recirculated air button (

 ) is not 

pressed (LED does not come on)

 

 

 

Blower switch on stage 4

 

 

 

Function check 

 

 

Test 
step/Scope of 
test
 

Operation/Requirement 

Specified value 

Possible cause/ Remedy 

1  
No heat 

Heater switch on "blue" stop

Air outlets, 
unheated air

Wire cable for 
actuating blend air 
flap  

 

2001 Mercedes-Benz ML320 

1998-2005 HVAC Climate Control - 163 Chassis

  

me 

 

AIR CONDITIONING (TEMPMATIC) DIAGNOSIS CONTENTS - AD83.30-P-1000GHZ 

MODEL 163 with CODE (580) Air conditioning or for USA, Tempmatic  

AIR CONDITIONING (TEMPMATIC) PRECONDITIONS FOR OPERATIONAL CHECK - AD83.30-P-2000-01GH 

up to 30.11.99  

Heater push-button 
unit  

2  
Full heat 

Heater switch on "red" stop

Air outlets, heated 
air

Wire cable for 
actuating air blend 
flap  

Heater push-button 
unit  

3  
Recirculated 
air mode
 

Heater switch in any position Recirculated 
air button (

 ) is pressed (LED comes 

on)

Air flow from 
center outlet 
increases 
noticeably

Cables  

Recirculated air 
button  

Actuator motor for 
recirculated air flap 
element (M39)  

Heater push-button 
unit  

4  
Heat output 

Connect temperature measuring instrument 
Heater switch on "red" stop

Air outlet 
temperature at 
defroster outlet > 
55°C

Engine coolant 
temperature  

Hot water coolant 
circulation pump  

Furring in cooling 
system and heat 
exchanger  

 

 

Test sequence

AD83.20-P-3000-01GH

K 2.6 [] 11

Air conditioning (Tempmatic) (Tempmatic A/C) diagnosis, previous 
knowledge

 

AD83.30-P-
2000GH

K 2.6 [] 12

Air conditioning (Tempmatic) (Tempmatic A/C) diagnosis, function 
check

 

AD83.30-P-
3000GH

K 2.6 [] 13

Air conditioning (Tempmatic) (Tempmatic A/C) diagnosis, function 
check actual values

 

AD83.30-P-
3001GH

K 2.6 [] 
14A

Air conditioning (Tempmatic) (Tempmatic A/C) diagnosis, fault memory  

AD83.30-P-
4000GH

K 2.6 [] 21

Air conditioning (Tempmatic) (Tempmatic A/C), testing electrical 
system

 

AD83.30-P-
6000GH

 

2001 Mercedes-Benz ML320 

1998-2005 HVAC Climate Control - 163 Chassis

  

me 

 

 

 

 

 

 

 

 

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