DISPLAY AND CONTROL ELEMENTS 4
MHL380 D 4.51
The outside air is drawn into the housing of
the heating and air conditioning system
through the rear wall of the cab (78/1). A
housing opening (77/5) is located behind the
driver's seat to allow circulating air to enter.
Do not block it! An electrically driven flap
closes the opening for circulating air and
therefore enables the opening for outside air
and vice versa.
The flap is operated using the button toggle
(77/89). The function display on the side indi-
cates the status. If the function display lights
up on the button toggle (77/89), the outside
air is closed. The system works in circulating
air mode. In circulating air mode, the cab win-
dows can mist up. If this happens, switch off
circulating air mode.
Air filter
In order to prevent the heater from becoming
contaminated, the circulating air/fresh air is
drawn in through the air filter (behind the driv-
er’s seat).
In dusty ambient conditions, the air cleaner
fleece should be cleaned or changed every
100 operating hours.
h Chapter 7.8.3 Maintenance and inspection
plan
â–º
Release the quick closures (79/1) on the
cover plate (79/1) and fold away the cover
plate.
â–º
Remove the frame (80/1), clean or if nec-
essary replace the fleece (80/2).
When inserting the fleece, ensure that the
blue side of the fleece is facing the rear
wall of the cab.
Fig. 78 Outside air supply
Fig. 79 Cover plate
Fig. 80 Fleece
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