Temperature sensor MERCEDES-BENZ S550 2007 W221 Owner's Manual

379 Controls in detail
Instrument cluster
Tachometer
The red marking on the tachometer de-
notes excessive engine speed.
To help protect the engine, the fuel supply
is interrupted if the engine is operated
within the red marking.
Outside temperature indicator
The outside temperature indicator is on
the bottom left-hand side of the instru-
ment cluster.
The temperature sensor is located in the
front bumper area. Due to its location, the
sensor can be affected by road or engine
heat during idling or slow driving. There-
fore, the accuracy of the displayed temper-
ature can only be verified by comparison to
a thermometer placed next to the sensor,
not by comparison to external displays
(e.g. bank signs, etc.).When moving the vehicle into colder ambi-
ent temperatures (e.g. when leaving your
garage), you will notice a delay before the
lower temperature is displayed.
A delay also occurs when ambient temper-
atures rise. This prevents inaccurate tem-
perature indications caused by heat
radiated from the engine during idling or
slow driving.
Fuel gauge
The fuel gauge is on the left-hand side of
the instrument cluster (
page 28). Once
the fuel level has fallen below the reserve
mark, the yellow segment indicator for the
fuel reserve comes on (page 550).
!
Excessive coolant temperature triggers a
warning in the multifunction display
(
page 588).
The engine should not be operated with the cool-
ant temperature above 248°F (120°C), i.e. in
the red zone of the coolant temperature gauge.
Doing so may cause serious engine damage
which is not covered by the Mercedes-Benz Lim-
ited Warranty.
i
During severe operating conditions,
e.g. stop-and-go traffic, the coolant temperature
may rise close to 248°F (120°C), i.e. close to
the red zone of the temperature gauge.
!
Avoid driving at excessive engine speeds, as
it may result in serious engine damage that is not
covered by the Mercedes-Benz Limited Warran-
ty.
Warning!
G
The outside temperature indicator is not de-
signed to serve as an ice-warning device and
is therefore unsuitable for that purpose.
Indicated temperatures just above the freez-
ing point do not guarantee that the road sur-
face is free of ice. The road may still be icy,
especially in wooded areas or on bridges.

569 Practical hints
What to do if …?
Display
Possible cause/consequence
Possible solution
Tire pressure monitor
currently unavailable
The Advanced TPMS* is unable to monitor
the tire inflation pressure due to:

a nearby radio interference source


the on-board voltage is too low


excessive wheel sensor temperatures
As soon as the causes for the malfunction are no longer present,
the Advanced TPMS* automatically becomes active again after
a few minutes driving.
Tire pressures
displayed after driving
a few minutes
Vehicles with Advanced TPMS*:
The tire inflation pressure is being checked.

Drive the vehicle for a few minutes.
Visit workshop
without shifting gears
The automatic transmission cannot be shift-
ed out of the set position because of a mal-
function.
If the automatic transmission is shift to positionD:
Without changing the automatic transmission from
positionD, drive to an authorized Mercedes-Benz Center.
If the automatic transmission is shift to positionN, R or P:

Do not drive.

Consult an authorized Mercedes-Benz Center.

692 IndexOccupant safety 44
Air bags 45
Children and air bags 61
Children in the vehicle 61
Fastening the seat belt 339
Front passenger front air bag off indica-
tor lamp 53
Infant and child restraint systems 62
LATCH-type child seat anchors 65
Seat belts 47, 339
OCS 50
Self-test 54
Odometer 245
Oil
Filler neck 497
Oil level see Engine oil
One-touch gearshifting 375
Operating safety 19
Voice Control* 257
Ornamental moldings, Cleaning 537
Outside temperature indicator 29, 379
Overdue maintenance service 533
Overhead control panel 37
Override switch 67
Overspeed range, Engine 675P
Paintwork, Cleaning 535
Panic alarm
Audible alarm and flashing exterior
lamps 68
Panic button 68
Panorama roof with power tilt/sliding
panel* 443
Opening/closing 444
Opening/closing in an
emergency 617
Synchronizing 446
Panorama roof with tilt/sliding panel*
Cleaning 541
Parcel net in front passenger
footwell 449
Park Assist* 409
Messages in display 566
Warning indicators 411
Parking 363, 481
Parking and standing lamps
Replacing bulbs 622
Parking brake
mechanically releasing 616
Messages in display 576Parking lamps
Messages in display 599
Parking position
Exterior rear view mirrors 335
Parktronic system* 405
Parktronic*
Cleaning system sensors 538
Malfunctioning 408
System sensors 538
Warning indicators 407
Parts service 650
Passenger compartment 486
Passenger safety see Occupant safety
PCMCIA card
Ejecting (COMAND) 109
Loading (COMAND) 108
Pedals 479
Plastic and rubber parts, Cleaning 541
POIs 177
Poly-V-belt drive 653, 676
Layout 653
Potential problems associated with under-
inflated and overinflated tires 517
Power assistance 479
Power closing assist for doors and trunk
lid 313