1997 MERCEDES-BENZ ML320 Complete Repair Manual

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Page 3353 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual Fig. 90: Identifying Auto Button And Temperature Thumbwheel
AUTO BUTTON, LOCATION / TASK / FUNCTION - GF83.40-P-2147GJ
MODEL 163 as of 01.09.01 with CODE (580a) Automatic air conditioning in the rea

Page 3354 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual RESIDUAL HEAT BUTTON, LOCATION / TASK / FUNCTION - GF83.40-P-2148GI
MODEL 163 as of 01.09.01 with CODE (580a) Automatic air conditioning
Fig. 92: Identifying Residual Heat Button

ELECTRIC FAN ENG

Page 3355 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual MODELS 163, up to 31.8.01, 168 with CODE (580) Air conditioning or Tempmatic for USA
MODEL 163 as of 1.9.01 with CODE (580a) Automatic air conditioning
FLUID RESERVOIR, LOCATION/PURPOSE/FUNCTION - G

Page 3356 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual REFRIGERANT PRESSURE SENSOR, LOCATION/TASK/FUNCTION - GF83.40-P-2156GH
MODEL 163 up to 31.08.01 with CODE (580) Air conditioning or Tempmatic for USA
AIR DISTRIBUTION BUTTON, LOCATION/TASK/FUNCTION

Page 3357 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual MODEL 163 as of 1.9.01 with ENGINE 112.942 /970 with CODE (580a) Automatic air conditioning
REFRIGERANT PRESSURE AND TEMPERATURE SENSOR, FUNCTION - GF83.40-P-2171-01GI
Detecting the refrigerant press

MODEL 163 as of 1.9.01 with ENGINE 112.942 /970 with CODE (580a) Automatic air conditioning
REFRIGERANT PRESSURE AND TEMPERATURE SENSOR, FUNCTION - GF83.40-P-2171-01GI
Detecting the refrigerant pressure
The refrigerant pressure and temperature sensor (B12/2) detects the refrigerant pressure and sends the
determined value via the CAN-BUS to the AAC push-button control module (N22). This value is compared
with a stored temperature/pressure curve.
The refrigerant pressure and temperature sensor (B12/2) operates in a pressure value range of from 0 to 35 bar.
Shutting of the refrigerant compressor
At the following values, the refrigerant compressor is switched off.
refrigerant pressure < 1.75 bar = refrigerant compressor OFF
refrigerant pressure > 30 bar = refrigerant compressor OFF
Switching on the refrigerant compressor
The refrigerant compressor is switched on at the following value
refrigerant pressure > 2.25 bar = refrigerant compressor ON
Detecting the refrigerant temperature
The refrigerant pressure and temperature sensor (B12/2) detects the temperature of the refrigerant and sends the
determined value via the CAN-BUS to the AAC push-button control module (N22). This value is compared
with a stored temperature/pressure curve and the refrigerant level is determined as a result.
With a refrigerant level that is too low, the refrigerant compressor is switched off by the AAC push-button
control module (N22) via the CAN-BUS.
The AC OFF mode is activated and can no longer be quit. Only when the error has been eliminated and the
diagnostic trouble code memory in the AAC push-button control module (N22) has been erased will the system
be operational again.
Auxiliary fan,
location GF83.40-P-2115-
02GH
Auxiliary fan,
purposeThe left auxiliary fan (M4m1) and right auxiliary fan (M4m2) serve
for cooling the coolant and the refrigerant.
Auxiliary fan,
functionup to 31.08.01GF83.40-P-2115-
01GH
as of 1.09.01GF83.40-P-2115-
01GI

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:16 PMPage 113 © 2006 Mitchell Repair Information Company, LLC.

Page 3358 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual The refrigerant pressure and temperature sensor (B12/2) operates in a temperature value range of from -10°C to
+90°C.
Cut-in of electric suction-type fan for engine and AC with integrated control

Page 3359 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual ENGINE AND AC ELECTRIC SUCTION FAN WITH INTEGRATED CONTROL, FUNCTION - GF83.40-P-2172-01GI
Function
Depending on the refrigerant pressure and/or on the coolant temperature the speed of the engine a

ENGINE AND AC ELECTRIC SUCTION FAN WITH INTEGRATED CONTROL, FUNCTION - GF83.40-P-2172-01GI
Function
Depending on the refrigerant pressure and/or on the coolant temperature the speed of the engine and AC electric
suction fan with integrated control (M4/7) is increased infinitely.
The engine and AC electric suction fan with integrated control (M4/7) receives the coolant temperature from the
coolant temperature sensor (B11/4) and the refrigerant pressure from the refrigerant pressure and temperature
sensor (B12/2).
This input information is compared by the engine and AC electric suction fan with integrated control (M4/7)
with the stored values and, if necessary, the speed of the engine and AC electric suction fan is increased to 100
%
The engine and AC electric suction fan with integrated control (M4/7) operates with AC switched on and in the
reheat mode for basic ventilation with a capacity of up to 20 %.
The basic ventilation can be switched off under the following conditions:
At an outside temperature of < or = 15°C.
The pressure-dependent fan speed remains the same.
At a driving speed of > 75 km/h.
The pressure-dependent fan speed remains the same.
An overrun time of 60 s can be set in order to ensure that the engine and AC electric suction fan with integrated
control (M4/7) will continue to operate even where the refrigerant compressor is temporarily switched off by
the icing protection.
The engine and AC electric suction fan with integrated control (M4/7) has a power rating of 850 W.
ELECTRIC SUCTION-TYPE FAN FOR ENGINE AND AC WITH INTEGRATED CONTROL, LOCATION/TASK/FUNCTION
- GF83.40-P-2172GI
MODEL 163 as of 1.9.01 with ENGINE 113.965 /981, 612.963, 628.963 with CODE (580a) Automatic air
conditioning
MODEL 163 as of 1.9.01 up to 31.8.02 with ENGINE 113.942 with CODE (580a) Automatic air
conditioning
and temperature sensor,
function GF83.40-P-
2171-01GI

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:16 PMPage 115 © 2006 Mitchell Repair Information Company, LLC.

Page 3360 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual Fig. 96: Identifying Electric Suction-Type Fan For Engine And AC With Integrated Control
BUTTON FOR REAR AREA AIR DISTRIBUTION, LOCATION/TASK/FUNCTION - GF83.40-P-2173GI
MODEL 163 as of 01.09.01 wit

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