2018 MERCEDES-BENZ CLA coolant level

Problem
Possible causes/consequences and P Solutions
The engine does not
start. You cannot hear
the starter motor. The on-board voltage is too low because the battery is too weak or
discharged. X
Jump-start the vehicle ( Y
page 278).
If the engine does not start despite attempt stoj ump-start it:X
Consult aq ualified specialist workshop.
The starter motor was exposed to at hermal load that was too high.X
Allow the starter motor to cool down for approximately two minutes. X
Try to start the engine again.
If the engine still does not start: X
Consult aq ualified specialist workshop.
The engine is not running
smoothly and is misfir-
ing. There is am alfunction in the engine electronics or in am echanical
componen toft he engine management system.X
Only depress the accelerator pedal slightly.
Otherwise, non-combusted fuel may get into the catalytic converter
and damage it. X
Have the cause rectified immediately at aq ualified specialist work-
shop.
The coolant temperature
gauge shows av alue
above 248 ‡( 120 †).
The coolant warning
lamp may also be on and
aw arning tone may
sound. The coolant level is too low. The coolant is too hot and the engine is no
longer being cooled sufficiently. X
Stop as soon as possible and allow the engine and the coolant to
cool down. X
Check the coolant level ( Y
page 260). Observe the warning notes
as you do so and add coolant if necessary.
DYNAMIC SELEC Tb utton (all vehicles
except Mercedes-AMG vehicles) Use the DYNAMIC SELECT button to change the
drive program. Depending on the drive program
selected the following vehicle characteristics
will change: R
the drive (engine and transmission manage-
ment) R
the suspension (vehicles with damping sys-
tem or AMG adaptive sport suspension sys-
tem) R
the steering R
the availability of the ECO start/stop function R
the climate control:
Each time you start the engine with the Smart-
Key or the Start/Stop button, drive program C is
activated. For further information about starting
the engine, see ( Y
page 125). X
Press DYNAMIC SELECT button C as many
times as necessary until the desired drive
program is selected.
The selected drive program appears in the
multifunction display .A fter five seconds the
display goes out and the status icon of the
selected drive program appears.128
DYNAMIC SELECT button (all vehicles except Mercedes-AMG vehicles)
Driving and parking

There is as hort delay before ac hange in outside
temperature appears in the multifunction dis-
play.
Coolant temperature gauge
G WARNING
Opening the hood when the engine is over-
heated or when there is af ire in the engine
compartment could expose you to hot gases
or other service products. There is ar isk of
injury.
Let an overheated engine cool down before
opening the hood. If there is af ire in the
engine compartment ,k eep the hood closed
and contact the fire department. ! Ad isplay message is shown if the coolant
temperature is too high.
If the coolant temperature is over 248 ‡
(120 †), do not continue driving. The engine
will otherwise be damaged.
The coolant temperature gage is in the instru-
ment cluster on the right-hand side ( Y
page 33).
The H marking in the coolant temperature gauge
corresponds to ac oolant temperature of
approximately 248 ‡( 120 †).
Under normal operating conditions and at the
correc tc oolant level, the coolant temperature
gauge may rise to the H marking.
Operating the on-board computer
Overview
C
Multifunction display
D
Right control panel

Checking and addin go ther service
products
Checking coolan tl evel
G WARNING
The coolin gs ystem is pressurized, particularly
when th em otor is warm .Ify ou open th ec ap,
you coul dbes ca lded if hot coolant sprays out.
Ther eisar is kofi njury.
Let th ee ng in ec oo ld own before you open the
cap. Wear gloves and eye protection .S lowly
open th ec ap to relieve pressure.
! The coolant may only be checked and cor-
recte dw hen th ee ng in eisc oo l( coolan tt em -
peratur eb elow 10 4‡( 40 †) .C heckin gt he
coolan tw hen th ec oo lan tt em peratur ei s
abov e1 04 ‡( 40 †) ma yr esult in damage to
th ee ng in eortot he engin ec oo lin gs ystem.
X
Par kt he vehicl eonal evel surface.
Only chec kt he coolan tl evel when th ev ehicl e
is on al evel surfac ea nd th ee ng in eh as cooled
down .X
Turn th eS ma rtKey to position H in th ei gni-
tion loc k( Y
page 122).X
Chec kt he coolan tt em perature display in th e
instrumen tc luster.
The coolan tt em perature mus tbeb elo w
10 4‡ (40 †).X
Turn th eS ma rtKey to position Z
( Y
page 122) in th ei gnition loc k.X
Slowly tur nc ap C counter-clockwise and to
reliev ee xces sp ressure.X
Turn cap C further counter-clockwise and
remove it .
If th ec oo lan tisatt he level of marke rb ar