1997 MERCEDES-BENZ ML320 Complete Repair Manual

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Page 3297 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual BLOWER SWITCH, LOCATION - GF83.25-P-2100-01GH
Heater depiction
The blower switch (1) is located in the heater control unit.
Fig. 43: Identifying Blower Switch On Heater Control Unit

BLOWER SWITC

Page 3298 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual blower level 2 --> blower level 3
may lead to an increase in the speed of the blower motor due to the short-term bridging of two contact plates
(intermediate setting).
BLOWER SWITCH, LOCATION/TASK/

Page 3299 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual Fig. 45: Identifying Blower Switch - Model 163 As Of 1.9.01 With Code (580a Automatic Air
Conditioning
AIR DISTRIBUTION SWITCH, FUNCTION - GF83.25-P-2101-01GH
Function
Turning the air distributio

Page 3300 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual Automatic
Pressing the Auto button ( )
Turning the air distribution switch on the AAC push-button control modul e (N22) actuates the various air
distribution actuators via air conditi

Page 3301 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual AIR DISTRIBUTION SWITCH, LOCATION/TASK/DESIGN/FUNCTION - GF83.25-P-2101GI
MODEL 163 as of 1.9.01 with code (580a) Automatic air conditioning
Fig. 47: Identifying Air Distribution Switch
- Model 16

Page 3302 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual clockwise direction to the final indented position (max. cooling), the recirculation switch is bypassed and thus
the fresh air flaps closed, in order to achieve the max. interior cooling (with A/C ON

Page 3303 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual TEMPERATURE SELECTOR WHEEL, LOCATION/TASK/DESIGN/FUNCTION - GF83.25-P-2102GI
MODEL 163 as of 1.9.01 with code (580a) Automatic air conditioning
Fig. 49: Identifying Temperature Selector Wheel
- Mo

Page 3304 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual After starting, the refrigerant compressor starts up. If cooling is not necessary, the refrigerant compressors
output is lowered and switched off via the icing inhibitor.
The air conditioning is al

After starting, the refrigerant compressor starts up. If cooling is not necessary, the refrigerant compressor's
output is lowered and switched off via the icing inhibitor.
The air conditioning is always ready for operation after the engine has been started, and operates according to
the so-called "reheat" principle. This means: The refrigerant compressor always operates at an ambient
temperature in excess of 1°C, therefore also cools cold incoming air. Following the cooling process, the dried
air is heated at the heat exchanger.
On the one hand, this effect serves the purpose of comfort, because cooling also simultaneously causes air
dehumidification which, in turn, is an important prerequisite for a pleasant interior climate. On the other hand,
the air is dried as a result of this cooling and heating, thereby preventing window fogging.
Pressing the AC button again ( ) (does not illuminate) switches off the cooling.
Heating mode
The in-car temperature sensor measures the air temperature in the interior of the vehicle.
The air conditioning control module electronics compares the in-car temperature with the desired temperature
which has been set at the temperature selector wheels.
The microprocessor adjusts the air conditioning electronics or keeps the relevant setting constant as required.
Heater operation with heater booster in vehicles with engine 612.963 as of 12/99
In vehicles equipped with direct-injection diesel engines, an electrical heater booster is additionally installed in
the evaporator housing downstream of the heat exchanger, in order to compensate any heater output deficit
which exists under certain operating conditions.
The 3 heating elements in the heater booster are supplied with current, whereupon they are heated and they start
to glow. As a result of the structural conditions, it is ensured that the drawn in fresh air flows directly past the
electric heater booster, and is therefore heated.
Cooling mode
The icing inhibitor measures the temperature at the evaporator air outlet, while the interior temperature sensor
determines the relevant in-car temperature.
The air conditioning control module electronics compares the various measured values with the desired
temperature which has been set at the temperature selector wheels.
The microprocessor adjusts the air conditioning or keeps the relevant setting constant as required.
In-car temperature sensor replaced by new typeas of 1.12.99BT83.57-P-0001-04GH
Ventilation, function GF83.10-P-2000GH
Heater circuit function GF83.20-P-2003GH

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:15 PMPage 60 © 2006 Mitchell Repair Information Company, LLC.

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