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Climate Control – Overview
Pollen filter
E97258
The pollen filter must be changed at intervals in
accordance with the service schedule. A special
production pollen filter is installed in the factory,
and this must be cut through when the filter is
changed. The service pollen filter is flexible and
can be pushed together during installation or
removal.
Heat exchanger
E97249
The heat exchanger is accessible from the
right-hand side of the climate control housing (LHD
and RHD). It can be removed and installed with
the climate control housing still installed in the
vehicle. During removal, the coolant pipes of the
production heater core must be sawn through.
During servicing, a heater core with separate
coolant pipes is installed.
Evaporator assembly
E97250
The evaporator is located on the right-hand side
of the climate control housing (LHD and RHD). It
can only be removed and installed with the climate
control housing still installed in the vehicle, and the
heat exchanger must be removed at the same time.
Blower motor
CAUTION: Make sure that the blower motor
and fan assembly is placed on the bench
with the fan pointing upwards.
412-131
E101398
To prevent damage to the fan wheel vanes, the
fan wheel must not be touched. For this reason, a
special tool (412-131) has been introduced for
removal and installation of the blower motor. This
tool is pushed onto the central shaft in order to lift
out the blower motor.
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Climate Control – System Operation and Component Description
System Diagram
Climate control system - vehicles with manual temperature control
3214
E97574
Description
Item
Climate control system control assemblyRefer to Component Description: Control
assembly, climate control - vehicles with
manualtemperaturecontrol(page24)
1
Air flap actuator
2Description
Item
Blower motor resistor
3
Blower motor
4
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Description
Item
Climate control system control assemblyRefer to Component Description: Control
assembly, climate control - vehicles with
automatictemperaturecontrol (page25)
1
Blower control moduleRefer to Component Description: Blower
control module - vehicles equipped with
automatictemperaturecontrol(page26)
2
Blower motorRefertoComponentDescription:(page
26)
3
Air flap actuator
4
Actuator - right-hand temperature control
flap
5
Actuator - left-hand temperature control
flap
6
Actuator - air distribution flap - demister
vents
7
Actuator - air distribution flap - center
vents
8Description
Item
Genetic electronic module (GEM).
9
Ambient air temperature sensorRefer to Component Description:
Ambienttemperaturesensor(page26)
10
Air outlet temperature sensor - left-hand
center vents
11
Air outlet temperature sensor - right-hand
center vents
12
Air outlet temperature sensor - left-hand
footwell
13
Air outlet temperature sensor - right-hand
footwell
14
Solar sensorRefer to Component Description: Sun
sensor - vehicles with automatic
temperaturecontrol(page25)
15
In-vehicle temperature sensorRefertoComponentDescription:(page
26)
16
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Air conditioning system - vehicles with manual temperature control
18
6
7
3
9
2
5
4
E97576
HS-CAN
MS-CAN
Description
Item
Air conditioning compressor
1
Climate control system control assemblyRefer to Component Description: Control
assembly, climate control - vehicles with
manualtemperaturecontrol(page24)
2
Genetic electronic module (GEM).
3Description
Item
Ambient air temperature sensorRefer to Component Description:
Ambienttemperaturesensor(page26)
4
instrument cluster
5
High pressure limiting switch
6
Dual pressure switch
7
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Description
Item
Powertrain control module (PCM)
8Description
Item
9 Air conditioning clutch relay
Air conditioning system - vehicles with automatic temperature control
18
6
7
3
9
5
2
4
E97577
HS-CAN
MS-CAN
MS-CAN
Description
Item
Air conditioning compressor
1
Climate control system control assemblyRefer to Component Description: Control
assembly, climate control - vehicles with
automatictemperaturecontrol(page25)
2Description
Item
Genetic electronic module (GEM).
3
Ambient air temperature sensorRefer to Component Description:
Ambienttemperaturesensor(page26)
4
instrument cluster
5
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Description
Item
Blower motorRefertoComponentDescription:(page
26)
1
Pollen filterRefertoComponentDescription:(page
24)
2
Evaporator assembly
3
Heat exchanger
4
Electric booster heater (if equipped)
5Description
Item
Temperature blend door motor
6
Air distribution flap, demister vents
7
Air distribution door - center vents
8
Air distribution door - footwell
9
Air intake door
10
Air duct, demister vents
11
Air passages - center vents
12
Air ducts, rear footwell
13
Air flow - defroster vents
12
E69659
Description
Item
Warm air
1
Cold air
2
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1
2
3
5
4
67
8
9
10
11
E100819
Description
Item
Condenser
1
Air conditioning compressor
2
Suction accumulator
3
Evaporator assembly
4
Blower motor
5Description
Item
Evaporator Core Orifice Tube
6
Cooling fans.
7
High - pressure (liquid and warm)
8
Low - pressure (liquid and cool)
9
Low pressure (gaseous and cold)
10
High pressure (gaseous and hot)
11
The engine driven refrigerant compressor (2) sucks
in gaseous refrigerant from the suction accumulator
and compresses it. The temperature of the
refrigerant rises to a value between 70 °C and 110
°C. It passes to the condenser (1) under high
pressure.
At this point heat is drawn from the refrigerant by
the air being forced past the cooling fins. Because
of this heat loss, the refrigerant liquefies and leaves
the condenser.
A fixed orifice tube (6), which separates the
refrigerant at high pressure from that at low
pressure, is located between the condenser and
the evaporator (5). This fixed orifice tube slows
down the flow of the refrigerant from the compressor, so that pressure builds up in the
condenser.
After passing through the fixed orifice tube the
liquid refrigerant expands in the circuit to the
evaporator, where it becomes gaseous. This
causes heat to be extracted from the air coming
into the vehicle. The air cools down, and excess
moisture contained in it is condensed and is
drained off. The refrigerant coming from the
evaporator flows into the refrigerant accumulator
and is again sucked in by the refrigerant
compressor.
The system is protected by a high-pressure limiting
switch, in order to prevent damage by excessive
pressure (e.g. because of overfilling with
refrigerant). If the pressure exceeds the maximum
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permitted, the high-pressure switch turns off the
refrigerant compressor.
The compressor on-off cycle is controlled by the
dual pressure switch depending on the pressure
in the refrigerant accumulator. The dual pressure
switch turns the refrigerant compressor off
permanently if the pressure falls below a permitted
value (e.g. if there is a leak).
Component Description
Air conditioning compressor
E100826
The special feature of a compressor with variable
swash plate is that the stroke of the pistons can
be varied by means of the variable swash plate.
The swash plate is mounted on a slide rail in the
axial direction.
The piston stroke and thus the delivery rate are
determined by means of the variable obliqueness
of the swash plate.
The obliqueness of the swash plate is dependent
upon the chamber pressure and thus on the
pressure conditions at the top and bottom of the
piston. This is supported by springs in front of and
behind the swash plate.
The chamber pressure is determined by the high
and low pressure applied to the control valve and
by a calibrated orifice bore. If the low pressure is
relatively high, the control valve is opened and the
chamber pressure is reduced.
If the low pressure is relatively low, the control
valve is closed and the chamber pressure is
increased. The force due to the chamber pressure
exerted on the piston bottom, is higher than the
sum of the force due to the low pressure on the
piston top and the spring force.
Pollen filter
E97720
The fresh air flowing into the vehicle through the
air inlet housing passes through a pollen filter which
is located on the left-hand side of the climate
control housing (LHD and RHD) and removes
pollen and dust particles measuring 0.003 mm or
more.
Control assembly, climate control -
vehicles with manual temperature control
E97721
In vehicles with manual temperature control, the
heating and air conditioning are operated using
three rotary switches. The air distribution flaps are
actuated via the air distribution flap/temperature
control flap actuating unit, which is connected via
a rod to the control assembly for the climate
control. The temperature control flap is also
actuated via the air distribution flap/temperature
control flap actuating unit, which is connected via
a cable to the control assembly. In addition, the
operating switch for recirculated air mode and the
on/off switch for the air conditioning are located on
the control assembly.
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