Mercedes-Benz ML320. Service manual — part 692



If the victim's breathing is shallow, or the individual has stopped breathing altogether, tilt the head back
and administer artificial resuscitation. Call a doctor.

In case of ingestion



Consult a physician immediately.

SAFETY INFORMATION: CLIMATE CONTROL - AS83.00-Z-9999ZZ

MODEL all

TROUBLE DIAGNOSIS

AIR CONDITIONING SOMETIMES DOES NOT WORK - AF83.30-P-6000B

MODEL 124, 126, 129, 140, 163, 168, 170, 201, 202, 208, 210

Modification notes

Risk of explosion. Explosions may result when performing
welding or soldering work on a closed air conditioning system.
Risk of poisoning. Poisoning may result from inhaling
overheated refrigerant vapors. Risk of injury. Contact with
liquid refrigerant may result in injury to the skin and eyes.

MODEL 240

AS83.00-P-
0001-01H

Risk of death caused by contact with current conducting parts
when repairing parts of the external power supply

MODEL 639, 903 ...

AS83.00-
Z-0002-
01A

Risk of explosion caused by welding or soldering work on
closed air conditioning system. Risk of poisoning caused by
inhaling overheated refrigerant vapors. Risk of injury to skin
and eyes caused by contact with liquid refrigerant.

MODEL all

AS83.00-
Z-0001-
01A

Hazard from contact with parts conducting high voltages.

MODEL all with CODE
(H25) Eberspacher D 30
W with CODE (H26)
Webasto DW 300

AS83.70-
Z-0001-
01A

Risk of explosion caused by fuel vapors igniting, risk of
poisoning caused by inhaling combustible gases and risk of
injury caused by burns during and after operation of heater unit

MODEL all with heater,
additional heating or
stationary heating

AS83.70-
Z-0002-
01A

Risk of explosion from liquefied petroleum gas flowing out
and from fuel vapors. Risk of poisoning from inhaling
combustion gases.

BODY 940, 972 ...

AS83.70-
Z-0004-
01A

Risk of poisoning due to inhalation of heater exhaust gases

MODELS 901, 902, 903,
904, 905 for underfloor
heaters

AS83.70-
Z-0005-
01A

1.9.99

Supersedes STIP 83.30-007 dated 15.8.97

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me

Parts ordering notes

INSUFFICIENT AIR CONDITIONING DURING IDLING - AF83.30-P-6007A

MODEL 163.154 #A up to 289564, 163.154 #X, 163.136 /172 with CODE (580) Air conditioning or
Tempmatic for USA

Modification notes

Operation no. of operation texts or standard texts and flat rates

Damage
code

Cause

Remedy

83 751

Pressure sensor (B12) occasionally indicates wrong
pressure value to control and operating module
(N19/22) (depending on temperature).

1 Connect pressure gauge and HHT.

Air conditioning/automatic air conditioning

occasionally does not function, refrigerant
compressor does not run.

2 Call up air conditioning actual values
with HHT.

3 Compare refrigerant pressure
between pressure gauge (high pressure
side) and HHT.

If pressure difference is greater than

2 bars.?
4 Remove/install/replace pressure
sensor on receiver/drier.

Part no.

Designation

Quantity

140 830 00 72

Pressure sensor

As required

21.6.04

Work steps 1-2 erased

Category

Op.
no.

Operation text

Time

Acc.
no.

Code

P

023731

Install modified wiring harness for auxiliary fan (after
checking)

015
WU

-

-

Damage
code

Cause

Remedy

50 041 73

Fuse f44 blows due to
repeated switch-on of
additional fan

1 Check whether service auxiliary wiring harness (2)
for additional fan has already been installed

The original additional fan connector (M4x1) is

already fastened next to the new additional fan
connector (3) with adhesive tape.

If auxiliary wiring harness (2) is already

installed: ?
2 Ensure that a 40 A fuse is located at position f44

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me

Fig. 130: Identifying Fuse And Relay Module, Additional Fan Connector And Plug Connector, Blue

NO REFRIGERATION/HEAT FROM AUTOMATIC AIR CONDITIONER - AF83.40-P-3400A

MODEL 163.### #A as of 289565 up to 458809, 163.### #X as of 754620 up to 777100

Operation no. of operation texts or standard texts and flat rates

If an auxiliary wiring harness (2) has not yet been

installed: ?

3 Install auxiliary wiring harness.

SM83.30-P-
0009GH

If an additional wiring harness and a 40 A fuse are

already installed and the auxiliary fan does not
function: ?
4 Perform corresponding diagnosis and repair.

Category

Op. no.

Operation text

Time

Acc. no.

Code

P

831917

Replace air conditioning operating unit

014 WU

-

-

Damage
code

Cause

Remedy

83 491 90

The air mixing flap is not actuated by the AAC [KLA]
control and operating unit (N22) because the voltage in
the vehicle electrical system is too low during cold start.

1 Replace AAC [KLA]
control and operating AR83.40-P-

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me

Parts ordering notes

HEATER DOES NOT FUNCTION - AF83.40-P-6008A

MODEL 163.154 /174 /175 #A as of 289565 up to 348398 with CODE (494) USA version with CODE (580)
Automatic air conditioning

MODEL 163.113 /154 /174 /175 #A as of 289565 up to 348412, 163.113 /128 #X as of 754620 up to 772006
except CODE (494) USA version with CODE (580) Automatic air conditioning

Modification notes

Operation no. of operation texts or standard texts and flat rates

This fault occurs only on AAC [KLA] control and

operating units (N22) with part number A163 820 25 89,
A163 820 28 89, A163 820 42 89 and A163 820 43 89

unit (N22)

6500GH

Part no.

Designation

Quantity

163 820 49 89

ECE AAC [KLA] control and operating unit

1

163 820 50 89

USA AAC [KLA] control and operating unit

1

12.5.04

Information revised in step 11; WE table added; part number revised

Category

Op. no.

Operation text

P

023610

Perform diagnosis on left air mixing flap actuator motor (M2/6)

Damage
code

Cause

Remedy

83 491
90

The automatic air
conditioning control unit
(N22) does not communicate
with the blending air flap
actuator motor (M2/6).

1 Connect STAR DIAGNOSIS and perform short
test.

AD00.00-P-
2000-04A
*WH58.30-
Z-1048-13A

If fault codes are present: ?

2 Perform diagnosis and repair according to fault
code description.

If NO fault codes are present: ?
Perform following test when engine is cold.

3 Select "Actual values" with STAR DIAGNOSIS
under "Automatic air conditioning".

4 Select "M2/6 (blending air flap actuator motor)".

5 Set temperature control to maximum cooling and
wait 30 seconds Observe the actual value of the
blending air flap actuator motor (M2/6) and switch
over the temperature control switch to maximum
heating.

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me