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
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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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Climate Control
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