Page 102 of 272

102 UNDERSTANDING YOUR INSTRUMENT PANELLegend for Switch Locations
1. Fog lamp switch (Optional), refer to "Fog Lamp
Switch".
2. Headlamp range control, refer to "Headlamp
Range Control".
3. Auxiliary heat exchanger switch (Optional).
4. Heated rear window (Optional).
5. Left-hand seat heater switch (Optional).
6. Central locking switch with load compartment lock
(Optional).
7. Alarm pushbutton.
8. Deactivate Acceleration skid control (ASR) switch.9. Switch for auxiliary heater – water heater only
(Optional)
10. Right-hand seat heater switch (Optional),
11. Sun roof operation switch (Optional).
12. Interior cargo area lighting (Optional),
refer to "Interior Cargo Area Lighting".
13. Towing/passenger compartment protection switch
(Optional).
14. Airflow switch for the air conditioner for rear
passenger compartment (Optional).
15. Temperature control (Optional).
16. Electric blower switch (Optional).
17. Windshield heater switch (Optional).
18. Constant RPM switch (Optional).Freightliner-all.book Pag e 102 Monday, December 1, 2003 2:54 PM
Page 109 of 272
UNDERSTANDING YOUR INSTRUMENT PANEL 109
4
HEATING, VENTILATIONTemperature control (1)
Airflow control (2)
Air distribution control (3)ZAir to the windshield and from the air vents
XAir to the windshield and footwell and from
the air vents
YAir to the footwell and from the air vents
hAir from the air vents
NOTE: If the vehicle interior has been heated up by
intense sunlight, ventilate the interior briefly before
driving the vehicle.
Only with automatic heater control (Optional):
The selected temperature is reached as quickly as
possible in heater mode and then held constant.
WARNING!
Follow the recommended settings for heating and
cooling given on the following pages. Otherwise
the windows could fog up, impairing visibility
and endangering you and others.
Freightliner-all.book Pag e 109 Monday, December 1, 2003 2:54 PM
Page 111 of 272
UNDERSTANDING YOUR INSTRUMENT PANEL 111
4
Select air recirculation if dust or unpleasant odors
enter the vehicle.
NOTE: Prolonged air recirculation can worsen the air
quality and lead to fogging up of the windows. Shut off
air recirculation as soon as possible.
Only with automatic heat regulation and regulated air
conditioning (Optional):
Air recirculation is automatically switched off after
about 15 minutes or when engine is shut off.
Heating1. Set the airflow control (2) as required.
2. Set the temperature control (1) as required.
3. Set the air distribution control (3) between Y
and X.
4. Switch off air recirculation, refer to "Air
Recirculation".
5. Adjust the air vents as required, refer to "Side Air
Vents and Center Air Vents".
Freightliner-all.book Pag e 111 Monday, December 1, 2003 2:54 PM
Page 112 of 272
112 UNDERSTANDING YOUR INSTRUMENT PANELDe-Fogging and De-Icing The Front Windows1. Set the airflow control (2) to position 3 or 4.
2. Set the temperature control (1)
to P.
3. Set the air distribution control (3) to Z.
4. Switch off air recirculation, refer to "Air
Recirculation".NOTE: On vehicles with auxiliary heater (water
heater):
The additional heat exchanger in the load
compartment should be switched off to quickly de-fog
and de-ice the windshield and front side windows,
refer to "Auxiliary Heat Exchanger in Load
Compartment".
For how to switch on heater booster mode, refer to
"Heater Booster".
On vehicles with air conditioner (Optional):
At outside temperatures above 41 °F (+5 °C), switch on
the air conditioner for quicker dehumidification, refer
to "Air Conditioning, Regulated".Freightliner-all.book Pag e 112 Monday, December 1, 2003 2:54 PM
Page 114 of 272
114 UNDERSTANDING YOUR INSTRUMENT PANELHeated Rear Window (Optional)
The switch for the heated rear
window is located on the right-hand
side next to the steering column.
It can be used only when the engine
is running.
To switch it on:
Press upward; the indicator lamp in the switch will
light up.
To switch off:
Press upward one more time.
NOTE: The heated rear window will automatically
switch off after about 15 minutes or when the engine is
turned off.
Windshield Heater (Optional)
The switch for the windshield heater
is located on the center section of the
dashboard.
It can be used only when the engine
is running.
To switch it on:
Press upward; the indicator lamp in the switch will
light up.
To switch off:
Press upward one more time.
NOTE: The windshield heater will automatically
switch off after about 5 minutes or when the engine is
turned off.
Freightliner-all.book Pag e 114 Monday, December 1, 2003 2:54 PM
Page 116 of 272

116 UNDERSTANDING YOUR INSTRUMENT PANELTo switch on:
Press switch (1), the indicator lamp (2) in the switch
lights up.
To switch off:
Press switch (1) again, the indicator lamp (2) goes out.
NOTE: Run the air conditioning at least once a month
for about 10 minutes.
It is possible that the air conditioning will
automatically switch off at outside temperatures below
41 °F (+5 °C). Dehumidification is then also not
possible.
Condensation may emerge from the underside of the
vehicle.
The air conditioner only uses the refrigerant R-134a.
This refrigerant does not damage the earth’s ozone
layer.
Climate Control (on Vehicles with A ir Conditioning)1. Set the airflow control (2) to position 1 to 4.
Position 4 gives maximum cooling.
2. Set the temperature switch (1) as required (The
interior temperature is regulated by the
Tempmatik. If the interior temperature falls below
the preset temperature, warm air is automatically
supplied).
3. Set the air distribution control (3) to h.
4. To switch on air conditioning, press switch (4).
WARNING!
While driving, deactivate the air conditioning
only temporarily to prevent window fogging.
Freightliner-all.book Pag e 116 Monday, December 1, 2003 2:54 PM
Page 130 of 272

130 UNDERSTANDING YOUR INSTRUMENT PANELTo switch on at blower speed 1:
Press the upper section, the left-hand indicator lamp in
the switch lights up.
To switch on at blower speed 2:
Press the lower section, the right-hand indicator lamp
in the switch lights up.
To switch off :
Press the switch to the middle position.
Operation is only possible when the key is turned to
position 2 in the ignition lock.
NOTE: The auxiliary heat exchanger in the load
compartment should be switched off at coolant
temperatures below 176 °F (+80 °C) to quickly de-fog
and de-ice the windshield and front side windows.
A UXILIA RY HEA TER – TIPS FOR COPING WITH
PROBLEMSThe heater either does not switch on or automatically
switches off:
Insufficient fuel, fill up the fuel tank. Start up heater
several times, until the fuel lines are filled.
The auxiliary heater will automatically switch off if
the fuel level is under about 4 US gal (15 l).
The fuses in the fuse box are damaged. Electric
fuses.
The battery voltage is too low, an undervoltage
protector switches off the heater if the battery
voltage falls below about 10 volts.
The heater motor does not run
The battery voltage is too low, check the battery.
Batteries.
The fuses in the fuse box are damaged.
Electric fuses.
The heater motor is damaged.
Freightliner-all.book Pag e 130 Monday, December 1, 2003 2:54 PM
Page 181 of 272

STARTING AND OPERATING 181
5
WARNING!
Take into consideration that when towing a trail-
er, the handling characteristics are different and
less stable from those when operating the vehicle
without a trailer.
It is important to avoid sudden maneuvers.
Sudden maneuvers may lead to loss of control
over the vehicle-trailer combination. This could
cause an accident resulting in property damage or
injury to you or others.
CAUTION!
If the transmission hunts between gears on
inclines, manually shift to a lower gear (select
"4",
"3", "2" or
"1"). A lower gear and reduction of
speed reduces the chance of engine overloading
and / or overheating.
When going down a long hill, shift into a lower
gear and use the engine’s braking effect. Avoid
riding the brakes, thus overheating the vehicle
and trailer brakes.
If the engine coolant rises to an extremely high
temperature (coolant temperature needle
approaching the red zone) when the air
conditioner is on, turn off the air conditioner.
Engine coolant heat can be additionally vented by
opening the windows, switching the climate
control fan speed to high and setting the
temperature control to the maximum hot position.
Freightliner-all.book Pag e 181 Monday, December 1, 2003 2:54 PM