Get Maintenance and care -> Engine compartment Guide for Mercedes A Class 4 Door Third Generation (2018-2026)

Maintenance and care

258

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When the engine is oꢀen leꢀ idling for long

periods

Engine compartment

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WARNING Risk of burns when opening the

hood

Opening and closing the hood

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Operation in particularly dusty conditions

and/or if air-recirculation mode is frequently

used

If you open the hood in the event of an over-

heated engine or ꢁre in the engine compart-

ment, the following situations may occur:

&

WARNING Risk of accident due to driving

with the hood unlocked

In these or similar operating conditions, have the

interior air ꢁlter, air ꢁlter, engine oil and oil ꢁlter,

for example, changed more frequently. The tires

must be checked more frequently if the vehicle is

operated under increased loads. Further informa-

tion can be obtained at a qualiꢁed specialist work-

shop.

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The hood may open and block your view.

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You may come into contact with hot gases.

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Never release the hood when driving.

You may come into contact with other

escaping hot operating ꢂuids.

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Before every trip, ensure that the hood is

locked.

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Before opening the hood, allow the

engine to cool down.

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WARNING Risk of accident and injury

when opening and closing the hood

In the event of a ꢁre in the engine com-

partment, keep the hood closed and call

the ꢁre service.

Battery disconnection periods

The hood may suddenly drop into the end

position.

The ASSYST PLUS service interval display can cal-

culate the service due date only when the battery

is connected.

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WARNING Risk of injury due to moving

parts

There is a risk of injury for anyone in the

hood's range of movement.

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Do not open or close the hood if there is

a person in the hood's range of move-

ment.

Components in the engine compartment may

continue to run or start unexpectedly even

when the drive system is switched oꢃ.

Display and note down the service due date

on the instrument display before disconnect-

ing the battery (/ page 257).

Observe the following if you must open the

hood:

Maintenance and care

259

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Electric lines to the ignition coils and the fuel

injectors

Opening the hood

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Switch oꢃ the vehicle.

Never touch the danger zones surround-

ing moving components, e.g. the rotation

area of the fan.

&

WARNING Risk of burns from hot compo-

nent parts in the engine compartment

#

Remove jewelery and watches.

Certain component parts in the engine com-

partment can be very hot, e.g. the engine, the

cooler and parts of the exhaust system.

Keep items of clothing and hair away

from moving parts.

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Allow the engine to cool down and only

touch component parts described in the

following.

&

WARNING Risk of injury from touching live

components

The ignition system and the fuel injection sys-

tem operate with a high voltage. You could

receive an electric shock.

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WARNING Risk of injury from using the

windshield wipers when the hood is open

#

Never touch components of the ignition

system or fuel injection system when the

vehicle is switched on.

If the windshield wipers start moving when the

hood is open, you could be trapped by the

wiper linkage.

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To release the hood, pull on handle 1.

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Always switch oꢃ the windshield wipers

and the vehicle ꢁrst if you need to open

the hood.

The live components include the following, for

example:

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Ignition coils

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Fuel injectors

Maintenance and care

260

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If the hood can still be liꢀed slightly, open the

hood again and close it with a little force until

it engages correctly.

On-board computer:

4

5

Service

Engine Oil Level

One of the following messages will appear on the

instrument display:

Engine oil

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Measuring Engine Oil Level...: measurement

of the oil level is not yet possible.

Checking the engine oil level using the on-board

computer

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Repeat the request aꢀer a maximum of

30 minutes' driving.

Requirements:

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The engine has been warmed up.

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Engine Oil Level OK and the bar display for

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indicating the oil level on the instrument dis-

play is green and is between "min" and "max":

the oil level is correct.

The vehicle is parked on a level surface.

The engine is running at idle speed.

The hood is closed.

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Engine Oil Level Add 1,1 qts. and the bar dis-

play for indicating the oil level on the instru-

ment display is orange and is below "min":

The engine oil level is determined during driving.

Determining the engine oil level can take up to

30 minutes with a normal driving style and even

longer with an active driving style.

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Push yellow handle 1 on the hood catch to

the leꢀ as far as it will go (palm downwards).

Liꢀ the hood until it is automatically raised by

the pneumatic spring.

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Add 1.1 US qt (1 l) of engine oil.

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Reduce Engine Oil Level and the bar display

for indicating the oil level on the instrument

display is orange and is above "max":

Closinng the hood

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Lower the hood and let it drop from a height of

approximately 8 in (20 cm).

Maintenance and care

261

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Drain oꢃ any excess engine oil that has been

added. To do so, consult a qualiꢁed specialist

workshop.

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WARNING Risk of ꢁre and injury from

engine oil

NOTE Damage caused by reꢁlling too

much engine oil

If engine oil comes into contact with hot com-

ponent parts in the engine compartment, it

may ignite.

Too much engine oil can damage the engine or

the catalytic converter.

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For Engine Oil Level Switch Ignition On

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Switch on the vehicle to check the engine oil

level.

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Have excess engine oil removed at a

qualiꢁed specialist workshop.

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Make sure that no engine oil is spilled

next to the ꢁller opening.

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Engine Oil Level System Inoperative: The oil

level sensor is defective or not connected.

%

Depending on driving style, the vehicle con-

sumes up to 0.9 US qt (0.8 liter) of oil per

600 miles (1000 km). The oil consumption

may be higher than this when the vehicle is

new or if you frequently drive at high engine

speeds.

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Allow the engine to cool oꢃ and thor-

oughly clean the engine oil from compo-

nent parts before starting the vehicle.

#

Consult a qualiꢁed specialist workshop.

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Engine Oil Level System Currently Unavail.

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Close the hood.

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NOTE Engine damage caused by an incor-

rect oil ꢁlter, incorrect oil or additives

Topping up engine oil

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Do not use engine oils or oil ꢁlters which

do not correspond to the speciꢁcations

explicitly prescribed for the service inter-

vals.

&

WARNING Risk of burns from hot compo-

nent parts in the engine compartment

Certain component parts in the engine com-

partment can be very hot, e.g. the engine, the

cooler and parts of the exhaust system.

Follow the instructions on the service

interval display for changing the engine

oil and observe the prescribed change

intervals.

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Allow the engine to cool down and only

touch component parts described in the

following.

Do not use additives.

Maintenance and care

262

Checking the coolant level

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WARNING Risk of burns from hot compo-

nent parts in the engine compartment

Certain component parts in the engine com-

partment can be very hot, e.g. the engine, the

cooler and parts of the exhaust system.

#

Allow the engine to cool down and only

touch component parts described in the

following.

&

WARNING Risk of scalding from hot cool-

ant

If you open the cap, you could be scalded.

#

Let the motor cool down before opening

the cap.

#

Turn cap 1 counter-clockwise and remove it.

Park the vehicle on a level surface.

#

Check the coolant temperature display in the

instrument cluster.

The coolant temperature must be in the bot-

tom quarter of the temperature display.

Add engine oil.

#

When opening the cap, wear protective

gloves and safety glasses.

Replace cap 1 and turn it clockwise until it

engages.

#

Open the cap slowly to release pressure.

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Check the oil level again (/ page 260).

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Slowly turn cap 1 counter-clockwise to

release overpressure.

Maintenance and care

263

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Continue turning cap 1 counter-clockwise

and remove it.

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WARNING ‑ Risk of ꢁre and injury from

windshield washer concentrate

The coolant level is correct in the following cases:

Windshield washer concentrate is highly ꢂam-

mable. It could ignite if it comes into contact

with hot engine component parts or the

exhaust system.

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If the engine is cold, the coolant is up to

marker bar 2.

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If the engine is warm, the coolant is up to

0.6 in (1.5 cm) over the marker bar 2.

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Make sure that no windshield washer

concentrate spills out next to the ꢁller

opening.

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If necessary, add coolant that has been

approved for Mercedes-Benz.

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Further information on coolant (/ page 332)

Reꢁlliing the windshield washer system

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WARNING Risk of burns from hot compo-

nent parts in the engine compartment

#

Remove cap 1 by the tab.

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Add washer ꢂuid.

Certain component parts in the engine com-

partment can be very hot, e.g. the engine, the

cooler and parts of the exhaust system.

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Further information about the windshield

washer ꢂuid (/ page 333)

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Allow the engine to cool down and only

touch component parts described in the

following.

Maintenance and care -> Engine compartment for Your Mercedes A Class 4 Door Third Generation (2018-2026)

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