1997 MERCEDES-BENZ ML320 Complete Repair Manual

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Page 3209 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual
AR88.40-P-3000GH
Remove/install engine hood
25.3.97

MODEL
163.113 /128 /136 /154 /157 /172 /174 /175

P88.40-2062-01

1
Screws

2
Gas pressure strut

Removing and installing

Danger!

Risk of

Page 3210 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual
OS00.00-P-1001-01A
Releasing gas from gas strut and emptying

Danger!

Risk of injury
from drilling gas-filled

subassemblies or components (gas filling non-

combustible)
Wear safety glasses an

Page 3211 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual
AR88.40-P-3010GH
Remove/install gas-operated strut on engine hood
6.4.99

MODEL
163.136 /154 /172 #A as of 145273,

163.136 /154 /172 #X as of 708319,

163.113 /128 /157 /174 /175

P88.40-2063-06

Page 3212 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual 2000-01 MANUAL A/C-HEATER SYSTEMS
ML 320, ML 430 & ML 55
SPECIFICATIONS
SPECIFICATIONS
DESCRIPTION & OPERATION
A/C CONTROL PANEL
The A/C control panel contains switches to control A/C functions s

Page 3213 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual Fig. 1: Identifying A/C Control Panel Functions
Courtesy of MERCEDES-BENZ OF NORTH AMERICA
BLOWER MOTOR KNOB
Located in the A/C control panel, the blower motor knob controls blower motor speed in 4

Page 3214 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual Mode control knob controls air distribution throughout the passenger compartment. Air distribution doors are
controlled by cables activated by the mode control knob. See Fig. 1
. Four mode positions

Page 3215 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual
2001 Mercedes-Benz ML320
2000-01 MANUAL A/C-HEATER SYSTEMS ML 320, ML 430 & ML 55
me
Saturday, October 02, 2010 3:25:10 PMPage 4 © 2006 Mitchell Repair Information Company, LLC.

Page 3216 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual Fig. 2: Locating Climate Control Components
Courtesy of MERCEDES-BENZ OF NORTH AMERICA
FRESH/RECIRCULATION SWITCH
Fresh/recirculation switch controls voltage signal to fresh air recirculation door m

Fig. 2: Locating Climate Control Components
Courtesy of MERCEDES-BENZ OF NORTH AMERICA
FRESH/RECIRCULATION SWITCH
Fresh/recirculation switch controls voltage signal to fresh air recirculation door motor. See Fig. 1 and Fig. 2 .
With switch indicator light on, air will recirculate. With switch indicator light off, air will enter from outside of
vehicle.
A/C CONTROL MODULE
The A/C control module (A/C amplifier) is the control unit for the A/C system. See Fig. 2 . The module
receives inputs from various sensors and processes the information to control various outputs for the A/C
system for optimal control.
The A/C control module inputs are as follows:
A/C Switch
In-Vehicle Air Temperature Sensor
Temperature Selector Knob
Blower Motor Knob
Evaporator Temperature Sensor
Air Mix Damper Door Position Sensor
The A/C control module output functions are as follows:
Air Mix Damper Door Motor
All Activity Module
Fresh/Recirculation Door Motor
ALL ACTIVITY MODULE
All Activity Module (AAM) receives inputs to determine if specified conditions have been met to allow
operation of A/C-heater system. If conditions are met, the AAM will send signals to the A/C compressor,
condenser fans relay and the blower motor relay to command or enable operation.
IN-VEHICLE TEMPERATURE SENSOR
The in-vehicle temperature sensor is a negative temperature coefficient resistor. Sensor sends signals to the A/C
control module to maintain in-vehicle temperature. Sensor is located on the center panel of the instrument
cluster.
DUST FILTER
A dust filter provides filtering of air entering or recirculating in the passenger's compartment. The dust filter is
mounted between blower motor and evaporator, below passen
ger's side of instrument panel, to left of blower

2001 Mercedes-Benz ML320
2000-01 MANUAL A/C-HEATER SYSTEMS ML 320, ML 430 & ML 55
me
Saturday, October 02, 2010 3:25:10 PMPage 5 © 2006 Mitchell Repair Information Company, LLC.

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