1997 MERCEDES-BENZ ML320 air condition

Fig. 156: Identifying Quick Test On Air Conditioning System - Shown On Models 901, 902, 903, 904
Shown on models 901, 902, 903, 904
Prerequisites for
testing
1Place vehicle with open
windows in the shade
2Set heater control valve
to "cold"
3
Set heating and
ventilation system to
fresh air mode

4
Fully open lateral
nozzles, center nozzles
and footwell flaps

5Start vehicle engine and
allow to idle
Inspecting
6Switch air conditioning
on
When the air conditioning is switched on, the vehicle
engine's idle speed must increase. No idle speed increase ?
Check function of refrigerant compressor RPM sensor in the
event of complaint ?


2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:18 PMPage 186 © 2006 Mitchell Repair Information Company, LLC.

Commercially available tools
Workshop equipment
DRAINING, EVACUATING AND REFILLING AIR CONDITIONING, CHECKING FUNCTION AND CHECKING FOR
LEAKS - AR83.30-P-1760GH
MODELS 163.113 /128 /136 /154 /157 /172 /174 /175 with CODE (580) Air conditioning or Tempmatic for
USA
Replace refrigerant compressor RPM sensor
Models 901-904
Not in model 163AR83.55-D-
5320A
7
Set blower rotary
switch to maximum
blower setting

8Check that refrigerant
flows free of bubbles
If the system is filled sufficiently, the refrigerant must flow
through the inspection glass (2) free of bubbles. A newly-
filled system may initially reveal bubbles. In this case, wait
for approx. 10 min. and check inspection glass again.
Does not reveal bubble-free flow ?

Check entire air conditioning circuit for leaks using leak
detector (3).AR83.30-D-
1209-01A
Air conditioning system leak detector*WE58.40-Z-
1002-20A
9Determine air outlet
temperature

Switch blower rotary switch to stage "1".
Insert sensor of temperature measurement device (1) into the
air outlet of the center nozzles.
After running for a period of 5 min., the air outlet temperature
must not be less than 2°C and more than 12°C. After 5 min., at
the latest, the refrigerant compressor must also be connected
and disconnected.
If the refrigerant compressor is disconnected at below 2°C ?
Check evaporator temperature switch. If the air outlet
temperature is not achieved ?
Check the connection and disconnection of the refrigerant
compressor or the refrigerant pressure upstream and
downstream of the refrigerant compressor.
*WH58.30-Z-
1005-08A
10
Switch air conditioning
off and shut vehicle
engine off

NumberDesignation
WH58.30-Z-1005-08ATemperature measuring device
WE58.40-Z-1002-20AAir conditioning leak detector

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:18 PMPage 187 © 2006 Mitchell Repair Information Company, LLC.

Fig. 157: Checking Draining, Evacuating And Refilling Air Conditioning Function
Draining

Risk of explosion from welding or
soldering work on closed air conditioning
system. Risk of poisoning . Inhaling
overheated refrigerant vapors may be
toxic. Risk of injury from skin and eye
contact with liquid refrigerant.
Do not carry out any welding work on the
closed air conditioning system or in the
surrounding area. No smoking or open flames.
Wear eye protection and protective gloves.
Work only in well ventilated areas. Carry out
repair work on the air conditioning system
circuit only after the system has been
discharged.
AS83.00-Z-
0001-01A
1
Connect the connector (blue) (3) of the
filling unit (1) to the Schrader valve of
the high-pressure line and the connector
(red) (2) to the Schrader valve of the
suction line.
During all steps, the operating instructions
for the particular filling unit must be
followed.

*WE58.40-
Z-1002-22A
2Discharge air conditioning system
3
Drain separated oil for refrigerant
compressor out of the inspection glass for
the filling unit and determine the quantity
exactly
Drained quantity must be replaced by fresh
oil for refrigerant compressor.
Evacuate
Clean air conditioning system and

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:18 PMPage 188 © 2006 Mitchell Repair Information Company, LLC.

Air conditioning system
Workshop equipment
REMOVE/INSTALL DEFROSTER VENT FLAP ACTUATOR MOTOR FOR WINDSHIELD - AR83.30-P-2006GH
MODEL 163.113 /154 /174 #A as of 289565, 163.113 #X as of 754620, 163.128/157/175
4evacuate
Filling
5Supplement oil for refrigerant
compressor The exact quantity determined when
drained must be used.
6Fill air conditioning system *BF83.30-P-
1001-01B
Testing
7Inspect air conditioning system for leaks
with leak detector *WE58.40-
Z-1002-20A

8
Risk of accident. Accidents may result if
the vehicle starts off unintentionally with
the engine running. Risk of injury from
bruises and burns if you hold your hand
near engine when it is started or when it
is running. Check function of air
conditioningSecure vehicle to prevent it from moving.
Wear closed and snug-fitting work clothes.
Do not grasp hot or rotating parts.
Run engine at idle speed for about 4
minutes and check all the component
functions which are of relevance for proper
operation of the air conditioning system.
AS00.00-Z-
0005-01A
NumberDesignationModel Series 163
BF83.30-P-1001-01BRefrigerantsFilling quantityg750
Specifications for Operating FluidsSheetBB00.40-P-0361-00A
WE58.40-Z-1002-20AAir conditioning leak detector
WE58.40-Z-1002-22AAir conditioning service station

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:18 PMPage 189 © 2006 Mitchell Repair Information Company, LLC.

REMOVE/INSTALL FRESH AIR/RECIRCULATED AIR STEPPER MOTOR - AR83.30-P-2010GH
MODEL 163.113 /128 /136 /154 /157 /172 /174 /175 with CODE (580) Air conditioning or Tempmatic for
USA
Shown on model 163 up to VIN A289564, X754619
Fig. 161: Identifying Fresh Air/Recirculated Air Stepper Motor Components (Shown On Model 163 Up
To VIN A289564, X754619)
7shutoff flap actuator motor
(M2/12) from heater housing
8Remove rear shutoff flap
actuator motor (M2/12)
Installation: Adjust rear
shutoff flap actuator motor
(M2/12)to 0 position using STAR
DIAGNOSIS.

9Install in the reverse order

Remove/install
1Remove instrument panel AR68.10-P-
1000GH
2Remove front passenger airbag unit AR91.60-P-
0680GH
Disconnect connector (4) from recirculated

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:18 PMPage 193 © 2006 Mitchell Repair Information Company, LLC.

REMOVING AND INSTALLING BLENDING AIR INCREMENT ADJUSTMENT MOTOR - AR83.30-P-2020GH
MODEL 163.113 /128 /136 /154 /157 /172 /174 /175 with CODE (580) Air conditioning or Tempmatic for
USA
Shown on model 163 up to VIN A289564, X754619
Fig. 162: Identifying Blending Air Increment Adjustment Motor Components (Shown On Model 163 Up
To VIN A289564, X754619)
3air flap actuator motor (M39)
4Unscrew screws (3) from recirculated air
flap actuator motor (M39) 3 screws are fitted as of
VIN A289565 X754620.
5Detach recirculated air flap actuator motor
(M39)from AC housing (1)
6Install in the reverse order

Remove/install
1Remove instrument panel AR68.10-P-
1000GH
2Disconnect connector (4) from blend air
flap actuator (M16/8)
3Unscrew screws (3) from blend air flap
screws are fitted as of VIN
A289565 X754620.

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:18 PMPage 194 © 2006 Mitchell Repair Information Company, LLC.

REMOVE AND INSTALL EVAPORATOR HOUSING - AR83.30-P-5200GH
MODELS 163.113 /128 /136 /154 /157 /172 /174 /175 with CODE (580) Air conditioning or Tempmatic for
USA
Fig. 163: Identifying Evaporator Housing Components (1 Of 2)
actuator (M16/8)
4Detach blend air flap actuator (M16/8)
from AC housing (1)
5Install in the reverse order

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:18 PMPage 195 © 2006 Mitchell Repair Information Company, LLC.

Fig. 164: Identifying Evaporator Housing Components (2 Of 2)

Remove/install

Risk of explosion from welding or
soldering work on closed air
conditioning system. Risk of
poisoning. Inhaling overheated
refrigerant vapors may be toxic.
Risk of injury from skin and eye
contact with liquid refrigerant.Do not carry out any welding work on the
closed air conditioning system or in the
surrounding area. No smoking or open
flames. Wear eye protection and
protective gloves. Work only in well
ventilated areas. Carry out repair work on
the air conditioning system circuit only
after the system has been discharged.
AS83.00-Z-
0001-01A
Procedures if air conditioning
system is damaged or leakingAll models
AH83.30-
N-0004-
01A

Protect air conditioning circuit and
components from moisture when
carrying out repair work
All models fitted with air conditioning
AH83.30-
N-0005-
01A
Notes on handling refrigerant
R134aAll models fitted with air conditioning
AH83.30-
N-0003-
01A
Risk of injury to skin and eyes
suffering scalding from contact
with hot coolant spray. Risk of
Do not open cooling system unless
coolant temperature is below 90°C. Open
cap slowly and release the pressure. Do
not pour coolant into beverage bottles.
AS20.00-Z-
0001-01A

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:18 PMPage 196 © 2006 Mitchell Repair Information Company, LLC.