140 Automatic transmission
-Never hold the vehicle on an incline with
a slipping clutch. The clutch opens auto
matically when it becomes too hot from
the overload. An indicator lamp
[O] illu
minates and a driver message appears
c!;> page 141 when the clutch is overload
ed.
- If the engine must remain running, never
have any driving position engaged when
checking under the hood. Make sure the
selector lever has securely engaged and
is locked in P with the parking brake
firmly set¢
page 257. Otherwise, any
increase in engine speed may set the ve
hicle in motion, even with the parking
brake applied.
(D Note
- When stopping on an incline, do not try
to hold the vehicle in place by pressing
the accelerator peda l while a driving gear
is selected. This can cause the transmis
sion to overheat and can damage it. Acti
vate the park ing brake or press the brake
pedal to prevent the vehicle from rolling.
- Allowing the vehicle to roll when the en
gine is stopped and the selector lever is
in
N will damage the transmiss ion be
cause it is not lubricated under those cir
cumstances.
Hill descent control
The hill descent control system assists the
driver when driving down declines.
H ill descent control is activated when these
lector lever is in D/S and you press the brake
pedal. The transmission automatically selects
a gear that is suitab le for the incline. Hill de
scent control tries to maintain the speed ach
ieved at the time of braking, within physical
and technical limitations . It may st ill be nec
essary to adjust the speed with the brakes.
Hill descent control switches off once the de
cline levels out or you press the accelerator pedal. When the speed
is set in the cruise control
system
c!;>page 111, hill descent control is al
so activated.
A WARNING
--
Hill descent control cannot overcome
physical limitations, so it may not be able
to maintain a constant speed under all
conditions. Always be ready to apply the brakes.
· Manual shift program
Using the manual shift program you can
manually select gears.
Fig. 160 Center console: shift ing the gears manually
Fig. 161 Steering wheel: Sh ift buttons•
Gear selection with selector lever
The tiptronic mode can be selected either with
the vehicle stationary or on the move.
.,. Push the selector lever to the right from D.
An
M appears in the instrument cluster dis
play as soon as the transmission has shifted .
.,. To upshift, push the se lecto r lever forward
to the plus position
0 c!;> fig. 160 .
.,. To downshift, push the lever to the minus
position
Q . 1J>-
-Antifreeze is poisonous . Always store an
t ifreeze in its or iginal container and well
out of the reach of children.
- If you drain the coolant, it must be
caught and safely stored in a proper con
tainer clearly marked "poison".
(D Note
- Coolant pollutes the environment and
could cause an engine fire. Excess coo l
ant will be forced out through the pres
sure re lief va lve in the cap when the en
gine becomes hot.
- If, in an emergency, only water can be
added, the correct ratio between water
and antifreeze ¢
page 264 must be re
stored as soon as possib le.
@ For the sake of the environment
Drained coolant should not be reused. Al
ways dispose of used coolant while observ ing all environmental regulations .
Radiator fan
The radiator fan switches on automatically by
itself
The radiator fan is driven by the engine via the
V-belt . The viscous clutch regulates the speed
of the fan accord ing to the temperature of the
coolant .
An auxiliary electric radiator fan* switches on
and off depending on coolant temperature
and other vehicle operating conditions .
After you switch the engine off, the auxilia ry
fan can continue running for up to 10 minutes
- even with the ignition off. It can even switch
on again later by itself¢& , if
- the temperature of the engine coolant rises due to the heat build-up from the engine in
the engine compartment, or
- the engine compartment hea ts up because
the vehicle is parked in intense sunlight .
Checking and fillin g 267
A WARNING
-To reduce the risk of personal injury nev
er touch the rad iator fan.
- The auxiliary electric fan is temperature
controlled and can switch on suddenly
even when the engine is not running .
- The auxiliary radiator fan switches on au
tomatically when the engine coolant reaches a certain temperature and will
continue to run until the coo lant temper
ature drops.
Brake fluid
Checking brake fluid level
The brak e fluid lev el can be check ed with a
quick glance.
N
N
-N ,.
:8
Fi g. 246 En gin e compa rtm en t: cover o n the bra ke fluid
reservoir
Before you check anything in the eng ine com
partment ,
always read and heed all WARN
INGS ¢ A in Working in the engine compart
ment on page 257.
.,. Read the brake fluid level from the brake
fluid reservoir ¢
fig. 246, ¢ page 259,
fig. 241.
The brake fluid level must be be
tween the "MIN" and "MAX" markings .
The brake fluid reservoir is located at the rear
partition of the eng ine compartment on the
left side ¢
page 259.
The fluid level may drop slightly after some
time due to the automatic adjustment of the
brake pads. This is not cause for alarm. ..,_
