raise the suspension to its normal height, press the
upper half of the rocker again.
When the panel lights are on, the tractor icon is
backlit in green.
IMPORTANT: The suspension dump switch is
guarded to prevent unintentional switch activa-
tion. This switch does not have a diagnostic
blink function when inactive.
When the suspension dump switch is pressed, three
responses are possible: a normal response, a slow
response, and an abnormal response.
Normal Response:
The LED in the switch blinks
while the suspension is deflating or filling. When it is
completely deflated, the LED comes on steady and
stays illuminated. In normal operation, the suspen-
sion may dump or fill so quickly that the blinking of
the switch is barely noticeable.
If operation of the switch is not possible for any rea-
son (vehicle is moving faster than 5 mph, ignition is
turned off, etc.), the LED will stop blinking and turn
off.
Slow Response:
If operation of the switch is slowed
for any reason (by cold weather, low air pressure,
etc.), the switch will continue to blink until the sus-
pension completes a dump or fill. As in the normal
response, the LED comes on steady and stays illumi-
nated when the suspension if fully deflated.
Abnormal Response:
If the LED blinks for more than
10 seconds, the suspension dump mechanism may
not be operating properly. Bring the vehicle to an au-
thorized Freightliner service facility for testing.
If the ignition is turned off while the vehicle is in
dump mode, the power to the dump solenoid is cut
off to prevent battery drain, and the suspension sys-
tem will autofill the rear air springs. The suspension
will also autofill if the vehicle is operated with the
suspension dumped, and the speed is over 5 mph
(e.g. -- driver forgot to inflate the bags or there was a
system failure).
Suspension Autofill Override Valve
The suspension autofill override option is a dash air
valve, that keeps the suspension deflated when the
ignition is turned off. To operate it, turn off the ignition
then push the override valve knob. See
Fig. 4.34
.
When the ignition is turned on, the override valve will
release automatically, and the suspension will autofill.
The suspension dump switch will then operate nor-
mally as described previously.
Heater/Air Conditioner Control
Panel
Standard controls (
Fig. 4.35
) for the heating, ventila-
tion, and air-conditioning system (HVAC) consist of
an eight-speed fan switch, an air selection switch,
and a temperature control switch. On vehicles with
air conditioning, the panel also contains a telltale
LED and an air recirculation button. See
Chapter 6
for detailed operating instructions for the HVAC.
Seat Controls
Bench Seat Adjustment Controls
The standard bench seat has one control: the seat
slide lever. See
Fig. 4.36
. The two-person bench
10/26/2001
f610597
Fig. 4.33, Suspension Dump Switch
PU
SH TO
09/11/2007
f321102
Fig. 4.34, Suspension Autofill Override Valve
Controls
4.15
