engine overheat MERCEDES-BENZ B-CLASS SPORTS 2014 User Guide

Useful information
i This Operator's Manual describes all
models and all standard and optional
equipment of your vehicle available at the
time of publication of the Operator's
Manual. Country-specific differences are
possible. Please not ethat your vehicle may
not be equipped with all features
described. This also applies to safety-
related system sand functions.
i Read the information on qualified
specialist workshops: (Y page 25).Engine compartment
Hood
Important safet ynotes G
WARNING
If the hood is unlatched, it may open up when
the vehicle is in motion and block your view.
There is arisk of an accident.
Never unlatc hthe hood while driving. G
WARNING
When openin gand closin gthe hood, it may
suddenly fall int othe closed position .There is
ar isk of injury to persons within range of
movement of the hood.
Open and close the hood only when no one is
within its range of movement. G
WARNING
Opening the hood when the engine is
overheated or when there is afire in the
engine compartmentc ould expose you to hot
gases or other service products. There is a
risk of injury.
Let an overheated engine cool down before
opening the hood. If there is afire in the
engine compartment, keep the hood closed
and contact the fire department. G
WARNING
The engine compartment contains moving
components. Certain components, such as
the radiator fan, may continue to run or start
again suddenly when the ignition is off. There
is ar isk of injury.
If you need to do any work inside the engine
compartment,
R switch off the ignition
R never reach into the area where there is a
risk of danger from moving components,
such as the fan rotation area
R keep clothin gaway from moving parts G
WARNING
The ignition system and the fuel injection
system work under high voltage. If you touch
components which are under voltage, you
could get an electric shock. There is arisk of
injury.
Never touch components of the ignition
system or fuel injection system when the
ignition is switched on.
Opening the hood G
WARNING
Certain components in the engine
compartment, such as the engine, radiator
and parts of the exhaust system, can become
very hot. Working in the engine compartment
poses arisk of injury.
Where possible, let the engine cool down and
touch only the components described in the
following. G
WARNING
When the hood is open and the windshield
wipers are set in motion ,you can be injured
by the wiper linkage. There is arisk of injury.
Always switch off the windshield wipers and
the ignition before opening the hood.
! Make sure that the windshield wipers are
not folded away from the windshield. You 280
Engine compartmentMaintenance and care

Only use brake fluid approved by Mercedes-
Benz according to MB Approval 331.0.
Information abouta
pproved brake fluid can
be obtaine datany qualified specialist
workshop or on the Internet at
http://bevo.mercedes-benz.com.
i Have the brake fluid renewed regularly at
aq ualified specialist workshop. Coolant
Importan tsafet ynotes G
WARNING
If antifreeze comes int ocontact with hot
component sinthe engin ecompartment ,it
may ignite. There is arisk of fire and injury.
Let the engin ecool down before you add
antifreeze .Make sure that antifreeze is not
spilled nex ttothe filler neck.T horoughly
clean the antifreeze from components before
startingt he engine.
! Only add coolant that has been premixed
with the desired antifreezep rotection. You
coul dotherwise damage the engine.
Further information on coolants can be
found in the Mercedes-Benz Specifications
for Service Products, MB Specifications for
Service Products 310.1, e.g. on the
Internet at
http://bevo.mercedes-benz.com .Or
contact aqualified specialist workshop.
! Always use asuitable coolant mixture,
even in countries where high temperatures
prevail.
Otherwise, the engine cooling system is not
sufficiently protected from corrosio nand
overheating.
i Have the coolant regularl yreplaced at a
qualified specialist workshop and the
replacement confirmed in the Maintenance
Booklet. Comply with the important safety precautions
for service products when handling coolant
(Y
page3 47).
The coolant is amixture of water and
antifreeze/corrosion inhibitor. It performs
the following tasks:
R corrosio nprotection
R antifreeze protection
R raising the boiling point
If the coolant has antifreeze protection down
to -35 ‡(-37 †), the boiling point of the
coolant during operatio nisapproximately
266 ‡(130 †).
The antifreeze/corrosion inhibitor
concentration in the engine cooling system
should:
R be at least 50%. This will protect the engine
cooling system against freezing down to
approximately -35 ‡(-37 †).
R not exceed 55% (antifreeze protection
down to -49 ‡[-45 †]). Otherwise, heat
will not be dissipated as effectively.
If the vehicle has lost coolant, add equal
amounts of water and antifreeze/corrosion
inhibitor.
Mercedes-Benz recommends an antifreeze/
corrosion inhibitor concentrate in
accordance with MB Specifications for
Service Products 310.1.
i When the vehicle is first delivered, it is
filled with acoolant mixture that ensures
adequate antifreeze and corrosion
protection.
i The coolant is checked with every
maintenance interval at aqualified
specialist workshop. Service products and filling capacities
351Technical data Z