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Heating and Air Conditioning 169
Climate Unit Main Control Panel
Fan Speed Control
The fan has four speeds and can also be
shut off. With the fan control in the 0 posi-
tion, air still flows out of the dash vents if
the vehicle is moving at highway speeds
and if the Fresh Air Control is set for out-
side air intake. If the Fresh Air Control is
set for full recirculation, the fan has to be
on for air to flow out the dash vents.
If equipped with air conditioning, the fan is
not controlled by the system to change fan
speed with changing temperatures. Adjust
the fan speed to the desired air flow.
Fan speed must be selected to meet either
heating or cooling needs. For the heater
only and manual air conditioning variants
of the climate system, settings of tempera-
ture and air flow must be adjusted as often
as necessary to accommodate changing
temperatures outside and inside the cab.
The ATC system is designed to maintain a
constant temperature in the cab, which is
set by the temperature control. As the sys-
tem does not make automatic changes of
fan speed, a selection of higher or lower
fan speed to allow for more or less air flow
may have to be made to achieve the correct
temperature.
W8001466