1997 MERCEDES-BENZ ML320 Complete Repair Manual

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Page 3377 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual ENGINE 111, 112, 271, 272, 611, 612, 646 in MODEL 203.7 with CODE (580) Air conditioning (or
Tempmatic for USA) with CODE (580) Automatic air conditioning with CODE (581) Automatic air
conditioning

Page 3378 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual Fig. 113: Identifying Belt Pulley, Function - Function Under Normal Operating Conditions
Function of refrigerant compressor lock up
When the refrigerant compressor locks up, the torque re quir

Page 3379 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual Fig. 115: Identifying Belt Pulley, Design
BELT PULLEY, LOCATION/TASK/DESIGN/FUNCTION - GF83.55-P-2103P
ENGINE 111, 112, 113, 271, 272, 611, 612, 642, 646 in MODEL 203.0 /2 with CODE (580) Air
condi

Page 3380 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual Fig. 116: Identifying Belt Pulley And Refrigerant Compressor - Shown On Model 203
PRESSURE RELIEF VALVE, FUNCTION - GF83.55-P-2104-02P
The pressure relief valve is a pressure sensitive wax valve. It

Page 3381 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual Shown on model 203
Fig. 117: Identifying Pressure Relief Valve And Refrigerant Compressor
- Shown On Model 203
TEMPERATURE CONTROL, FUNCTION - GF83.57-P-2000GH
MODEL 163 up to 31.08.01 with CODE

Page 3382 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual Cooling down
The thermostatic expansion valve located on the evaporator core serves to expand the liquid refrigerant which is
under high pressure thus lowering its pressure. After this the refriger

Cooling down
The thermostatic expansion valve located on the evaporator core serves to expand the liquid refrigerant which is
under high pressure thus lowering its pressure. After this the refrigerant evaporates. The evaporation heat
required for this is taken from the air flowing through the evaporator. The resulting cooled down air then
succeeds in entering the passenger compartment via the air ducts.
Reheat mode
The air which has been cooled down and dehumidified by the evaporator core is heated up again by the heat
exchanger (reheat). This serves to prevent the windows from misting up on the inside.
Temperature selector wheel, location/task/
design/function GF83.25-P-
2102GC
Heating system heat exchanger, location/
purpose/function GF83.20-P-
2108GC
Evaporator, location/purpose/design/function GF83.40-P-
2121GC
Expansion valve, location/task/design/function GF83.40-P-
2123GC
Refrigerant compressor, location/task/design/ function GF83.55-P-
2100GH
In-car temperature sensor, location/task/functionwith suction jet nozzle up to
30.11.99GF83.57-P-
2115GH
In-car temperature sensor with ventilation fan,
location/task/functionas of 01.12.99GF83.57-P-
2107GH
Defroster protection temperature sensor,
location/task/function GF83.57-P-
2113GH
Blending air flap actuator, location / task / function GF83.57-P-
2112GC
Outside temperature sensor, location/task/ functionas of 01.12.99GF83.57-P-
2110GH
Air conditioning control module, location/task/ function GF83.30-P-
2102GH
All Activity Module, location/task/function GF54.21-P-
4110GH
Electric heater booster position/task/design/ function Engine 612.963GF83.70-P-
4054GH
Temperature regulator microswitch, location/
task/function Engine 612.963GF83.70-P-
4055GH
Extended activity module, position/task GF54.21-P-
4106GH
Extended Activity Module, location/task/designas of 1.12.99GF54.21-P-
4107GK

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:17 PMPage 138 © 2006 Mitchell Repair Information Company, LLC.

Page 3383 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual TEMPERATURE CONTROL, FUNCTION - GF83.57-P-2000GI
MODEL 163 as of 01.09.01 with CODE (580a) Automatic air conditioning
Function
The electronically controlled cooling, heating and ventilation syste

TEMPERATURE CONTROL, FUNCTION - GF83.57-P-2000GI
MODEL 163 as of 01.09.01 with CODE (580a) Automatic air conditioning
Function
The electronically controlled cooling, heating and ventilation system of the automatic air conditioning achieves
the desired in-car temperature as rapidly as possible or maintains it constantly.
The following options are available for this purpose:
the evaporator cooling the air
the heating system heat exchanger heating the air
Temperature control
The temperature values needed for the temperature control are determined by the in-car temperature sensors
(N22b1), center nozzle air stream (B10/24), footwell at front (B10/25), rear (B10/7), outside temperature
indicator (B14) and defroster protection (R35).
The electronics of the AAC push-button control module (N22) compare the various test values with the
temperature preselected at the temperature selector wheel.
As required, the automatic air conditioning performs the regulation in that in heating mode it controls the
position of the blending air flaps, via the blending air flap actuator motor (M2/6), or in cooling mode it actuates
the refrigerant compressor and thus keeps the respective setting constant.
CDI control module, location/task/function Engine 612.963GF07.16-P-
3102IA
Temperature selector wheel, location/task/ design/function GF83.25-P-
2102GI
Heating system heat exchanger, location/ purpose/function GF83.20-P-
2108GC
Evaporator, location/purpose/design/function GF83.40-P-
2121GC
Expansion valve, location/task/design/function GF83.40-P-
2123GC
Refrigerant compressor, location/task/design/ function GF83.55-P-2100P
Control valve, location/task/function GF83.55-P-2102P
In-car temperature sensor, location/task/function GF83.57-P-
2115GI
Center nozzle air stream temperature sensor,
location/task/function GF83.57-P-
2116GI
Front footwell air stream temperature sensor, GF83.57-P-

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:17 PMPage 139 © 2006 Mitchell Repair Information Company, LLC.

Page 3384 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual IN-CAR TEMPERATURE SENSOR WITH ASPIRATOR BLOWER, LOCATION - GF83.57-P-2100-01GH
The in-car temperature sensor (B10/4) is located on the center console on the left next to the radio. The aspirator
bl

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