126 Automatic transmission
8_ WARNING
-Unintended vehicle movement can cause
serious injury .
- Never leave your vehicle with the engine
running while in gear. If you must leave
your vehicle when the engine is running,
activate the parking brake and move the
selector lever to P.
- Power is still transmitted to the wheels
when the engine is running at idle. To
prevent the vehicle from "creeping", you
must keep your foot on the brake when
the engine is running and the selector lever is in D/S or R or "tiptronic" mode is
selected.
- Do not press the accelerator pedal when
changing the selector lever position
while the vehicle is stationary and the
engine is running.
- Never shift into
R or P while driving.
- Before driving down a steep slope, re-
duce your speed and shift into a lower
gear with "tiptronic".
- Do not ride the brakes or press the brake
pedal too often or too long when driving
down a hill. Constant braking causes the
brakes to overheat and substantially re
duces braking performance, increases
braking distance or causes complete fail
ure of the brake system .
- To preven t the vehicle from rolling back
when stopping on inclines, always hold it
in place with the brake pedal or parking
brake.
- 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
Q page 128when 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 set
Q page 226, Engine compartment . 0th-erwise, any increase in engine speed may
set the vehicle 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 pedal while a driving gear is selected. This can cause the transmis
sion to overheat and can damage it. Acti
vate the parking 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 transmission be
cause it is not lubricated under those cir
cumstances.
@ Tips
For safety reasons, the parking brake is re
leased automatically only when the driv
er's safety belt is engaged in the buckle.
Hill descent control
The hill descent control system assists the
driver when driving down declines.
Hill 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 suitable for the incline. Hill de
scent control tries to maintain the speed ach
ieved at the time of braking, within physical
and technical limitations. If may still 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
q page 95, hill descent control is also
activated.
A WARNING
-
Hill descent control cannot overcome
physical limitations, so it may not be able
to maintain a constant speed under all
24 2 Ch ecking and filling
-If you drain the coolant, it must be
caught and safely stored in a p roper
conta iner clearly marked "poison".
(D Note
- Coolant pollutes the env ironment and
could cause an engine fire . Excess coo l-
ant will be forced out through the pres
sure relief valve 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 240 must be re
stored as soon as possible .
@ 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-be lt . The viscous clutch regulates the speed
of the fan accord ing to t he temperature of the
coolant.
An auxiliary electric radiator fan* switches on
a nd off depending on coolant temperature
and other ve hicle operating conditions.
After you switch the engine off, the auxiliary
fan can cont inue 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 heats up because
the veh icle is parked in intense sunlight.
_&. WARNING
- To reduce the r isk of personal injury nev
er to uch the radiator fa n. -
The a uxiliary electric fan is temperat ure
controlled and can switch on suddenly
even when the engine is not running.
- The auxiliary radiator fan switches on a u
tomatically when the engine coolant reaches a certai n temperature and will
continue to ru n until the coolant temper
ature drops.
Brake fluid
Checking brake fluid level
The brake fluid level can be checked with a
quick glance.
F ig. 2 00 Engine compart men t: cover on t he brake fluid
reservoir
Befo re you check anyth ing in the engine com
partment,
alway s read and he ed all WARN
INGS c::> ,&. in Working in the engine compart
ment on page 233.
.,. Read the brake fluid level from the b rake
fluid reservoir
c::> fig. 200, c::> page 235,
fig. 196.
The brake fl uid level m ust be be
tween the "MIN" and "MAX" markings.
T he bra ke fluid reservo ir is located at the rear
part ition o f the e ngine compartment on the
left s ide
c::> page 235.
The fluid level may drop slightly afte r some
t ime due to the a utomatic adjustment of the
brake pads. This is not cause for a larm .
If the brake fl uid level falls
considerably be
low the
"MIN" mar k, the brake war ning/ indi
cator light ( U.S. models:
1111 , Canadian
models :. will come on
c::> page 18 and
c::>page 29. Do not con tinue to operate the ve-
hicle . The comp lete brake system should be ..,.