Mercedes-Benz ML320. Manual — part 666

The fresh air/recirculated air flap shuts off the supply of recirculated air.

Fresh air is drawn in.

Recirculation mode

The fresh air/recirculated air flap shuts off the supply of fresh air. Air is drawn in from the passenger
compartment.

HEATER CORE, LOCATION/PURPOSE/FUNCTION - GF83.20-P-2108GC

MODEL 163, 168

HEATING WATER CIRCULATION PUMP, LOCATION/TASK/FUNCTION - GF83.20-P-2109GI

MODEL 163 as of 1.9.01 with code (580a) Automatic air conditioning

Fig. 41: Identifying Heating Water Circulation Pump

Heater core,
location

Model 168

GF83.20-P-
2101-02GC

Model 163

GF83.20-P-
2101-02GH

Heater core,
purpose

The heater core serves for heating up the air flowing through on the way
to the various defroster, ventilation and heating nozzles in the vehicle
passenger compartment.

Heater core,
function

GF83.20-P-
2101-01GC

Heating water
circulation pump,
position

The heating water circulation pump (M13) is located at the front
right in the engine compartment next to the coolant compensating
reservoir.

Heating water
circulation pump
task

The heating water circulation pump (M13) serves to maintain a
constant flow of hot water through the heat exchanger in the event of
low engine speeds and residual engine heat utilization.

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me

HEATER HOUSING POSITION/TASK/FUNCTION - GF83.20-P-2110GC

MODEL 163 up to 31.8.01

168 up to except CODE (580) Air conditioning or Tempmatic for USA

Shown on model 168 as of 1.03.01

Fig. 42: Identifying Heater Housing - Shown On Model 168 As Of 1.03.01

FRESH AIR/RECIRCULATED AIR FLAP, LOCATION/PURPOSE/FUNCTION - GF83.20-P-2111GC

MODEL 163, 168

Heating water
circulation pump
function

GF83.20-P-
2102-01GI

Heater housing
position

The heater housing (1) is located beneath the instrument
panel.

Model 168 up to 28.02.01

GF83.20-P-2103-
01GC

Model 163

GF83.20-P-2103-
01GH

Heater housing task

GF83.20-P-2103-
03GC

Heater housing
function

Model 168

GF83.20-P-2103-
02GC

Model 163

GF83.20-P-2103-
02GH

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me

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 SWITCH, FUNCTION - GF83.25-P-2100-02GC

Function

Depending on the setting of the blower switch, the current is guided via sliding contacts onto a contact plate,
and from there to the relevant series resistor assembly resistor for the set blower level.

On actuation of the starter, the control voltage for the blower (M2) is switched off at the control unit via
terminal 15x.

Model 168 as of 1.03.01

Blower level 4 is implemented by bridging two contact decks.

As a result of the design of the contact plate, the re-activation of

blower level 1 --> blower level 2 and

Fresh air/recirculated air
flap, location

Model 168

GF83.20-P-2104-
01GC

Model 163

GF83.20-P-
2104-01GH

Fresh air/recirculated air
flap, purpose

The fresh air/recirculated air flap switches the system
over from fresh air to recirculated air.

Fresh air/recirculated air
flap, function

Model 168

GF83.20-P-2104-
02GC

Model 163

GF83.20-P-
2104-02GH

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me

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/DESIGN/FUNCTION - GF83.25-P-2100GC

MODEL 163 up to 31.8.01 168

Shown on model 168 with heating as of 01.03.01

Fig. 44: Identifying Blower Switch (Model 168 With Heating As Of 01.03.01)

BLOWER SWITCH, LOCATION/TASK/DESIGN/FUNCTION - GF83.25-P-2100GI

MODEL 163 as of 1.9.01 with code (580a) Automatic air conditioning

Blower switch,
location

The blower switch (N119s3) is located on the left in the heater
push-button control module.

Model 168 up to 28.02.01

GF83.25-P-2100-
01GC

Model 163

GF83.25-P-2100-
01GH

Blower switch,
task

The blower switch activates several blower stages in fresh air
and recirculating air mode.

Blower switch
design

The blower switch is designed as a multi-level rotary switch with
an axis and wiper contact.

Blower switch,
function

GF83.25-P-2100-
02GC

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me