Get Maintenance and care -> Engine compartment Guide for Mercedes GLC Class SUV First Generation (2015-2021)

Maintenance and care 421

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frequent operation in mountainous terrain or

on poor road surfaces

when the engine is often left idling for long

periods

operation in particularly dusty conditions

and/or if air-recirculation mode is frequently

used

Engine compartment

Opening/closing the hood

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WARNING Danger of burns when open‐

ing the hood

If you open the hood when the engine has

overheated or during a fire in the engine

compartment, you could come into contact

with hot gases or other escaping operating

fluids.

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WARNING Risk of accident if the engine

hood is unlatched while driving

An unlocked engine hood may open up when

the vehicle is in motion and block your view.

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Before opening the hood, allow the

engine to cool down.

In the event of a fire in the engine com‐

partment, keep the hood closed and

call the fire service.

In these or similar operating conditions, have the

interior air filter, engine air cleaner, engine oil

and oil filter etc. changed more frequently. The

tires must be checked more frequently if the

vehicle is operated under increased loads. Fur‐

ther information can be obtained at a qualified

specialist workshop.

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Never unlatch the engine hood while

driving.

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Before every trip, ensure that the

engine hood is latched.

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WARNING Risk of accident and injury

when opening and closing the engine

hood

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WARNING Risk of injury due to moving

parts

Battery disconnection periods

Certain components in the engine compart‐

ment may continue to move or suddenly

move again even after the ignition has been

switched off, e.g. the cooler fan.

Make sure of the following before performing

tasks in the engine compartment:

When opening or closing the engine hood, it

may suddenly drop into the end position.

There is a risk of injury for anyone in the

engine hood's range of movement.

The ASSYST PLUS service interval display

can only calculate the service due date when

the battery is connected.

#

Note down the service due date displayed on

the instrument display before disconnecting

the battery (/ page 420).

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Only open or close the engine hood

when there are no persons in the

engine hood's range of movement.

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Switch the ignition off.

422 Maintenance and care

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Never touch the danger zone surround‐

ing moving component parts, e.g. the

rotation area of the fan.

Allow the engine to cool down and only

touch component parts described in

the following.

#

Remove jewelry and watches.

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WARNING Risk of injury from using the

windshield wipers while the engine hood

is open

#

Keep items of clothing and hair away

from moving parts.

When the engine hood is open and the wind‐

shield wipers are set in motion, you can be

trapped by the wiper linkage.

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WARNING Risk of injury from touching

component parts under voltage

The ignition system and the fuel injection

system work under high voltage. If you touch

component parts which are under voltage,

you could receive an electric shock.

#

Always switch off the windshield wipers

and ignition before opening the engine

hood.

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Never touch component parts of the

ignition system or the fuel injection sys‐

tem when the ignition is switched on.

Plug-in hybrid: observe the notes in the Supple‐

ment. Otherwise, you may fail to recognize dan‐

gers.

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To open: pull lever 1 to release the hood.

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WARNING Risk of burns from hot com‐

ponent parts in the engine compartment

Certain components in the engine compart‐

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

radiator and parts of the exhaust system.

Maintenance and care 423

Engine oil

The waiting time before checking the oil level

when the engine is at normal operating tempera‐

ture is five minutes.

Checking the engine oil level using the oil

dipstick

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WARNING Risk of burns from hot com‐

ponent parts in the engine compartment

Certain components in the engine compart‐

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

radiator and parts of the exhaust system.

#

Allow the engine to cool down and only

touch component parts described in

the following.

Plug-in hybrid: be sure to observe the notes in

the Supplement. Otherwise, you may not recog‐

nize dangers.

#

Push handle 1 of the hood catch upwards

and lift the hood by approximately 15 in

(40 cm).

To close: lower the hood and let it fall from a

height of approximately 8 in (20 cm).

If the hood can still be lifted slightly, open

the hood again and close it with a little more

force until it engages correctly.

Requirements:

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The engine must have an oil dipstick. If not,

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the engine oil level can be checked only with

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Park the vehicle on a level surface.

Pull oil dipstick 1 out and wipe off.

the on-board computer (/ page 424).

Depending on the engine, the oil dipstick may be

installed in the engine compartment in different

locations.

424 Maintenance and care

#

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Slowly slide oil dipstick 1 into the guide

park the vehicle on a level surface

leave the engine running at idle speed

Drain off any excess engine oil that has been

added. To do so, consult a qualified specialist

workshop.

For Engine Oil Level Switch Ignition On:

tube to the stop, and take it out again after

approximately three seconds.

On-board computer:

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Oil level is correct: oil level is between 2

and 3.

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5

Service

Engine Oil Level

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Switch on the ignition to check the engine oil

level.

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Oil level too low: oil level is at 3 or

below.

You will see one of the following messages on

the multifunction display:

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Engine Oil Level System Inoperative: sensor

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Oil level too high: oil level is above 2.

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Measuring Engine Oil Level...: measurement

faulty or not inserted.

of the oil level is not yet possible.

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If the oil level is too low, add 1.1 US qt

(1 liter) of engine oil.

If the oil level is too high, drain off excess

engine oil. Consult a qualified specialist

workshop.

#

Consult a qualified specialist workshop.

Engine Oil Level System Currently Unavail.:

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Repeat the request after a maximum of

30 minutes driving.

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Engine Oil Level OK and the bar display for

Close the hood.

indicating the oil level on the multifunction

display is green and is between "min" and

"max": the oil level is correct.

Adding engine oil

Checking the engine oil level using the on-

board computer

Requirements

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.

In order to receive a result as quickly as possi‐

ble:

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WARNING Risk of burns from hot com‐

ponent parts in the engine compartment

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Engine Oil Level Add 1.0 l and the bar display

for indicating the oil level on the multifunc‐

tion display is orange and is below "min":

Certain components in the engine compart‐

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

radiator and parts of the exhaust system.

#

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

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Allow the engine to cool down and only

touch component parts described in

the following.

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Reduce Engine Oil Level and the bar display

for indicating the oil level on the multifunc‐

tion display is orange and is above "max":

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warm up the engine

Maintenance and care 425

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Follow the instructions in the service

interval display regarding the oil

change.

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WARNING Risk of fire and injury from

engine oil

If engine oil comes into contact with hot

component parts in the engine compart‐

ment, it may ignite.

NOTE Damage caused by adding too

much engine oil

*

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Make sure that no engine oil is spilled

next to the filler opening.

Allow the engine to cool off and thor‐

oughly clean the engine oil from compo‐

nent parts before starting the vehicle.

Too much engine oil can damage the engine

or the catalytic converter.

#

Have excess engine oil removed at a

qualified specialist workshop.

NOTE Engine damage caused by an

incorrect oil filter, incorrect oil or addi‐

tives

*

#

Turn cap 1 counter-clockwise and remove

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Do not use engine oils or oil filters

which do not correspond to the specifi‐

cations explicitly prescribed for the

service intervals.

Do not alter the engine oil or oil filter in

order to achieve longer change intervals

than prescribed.

it.

#

Add engine oil.

Replace cap 1 and turn it clockwise as far

as it will go.

#

Check the oil level again (/ page 423).

Do not use additives.

426 Maintenance and care

Checking coolant level

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WARNING Risk of scalding from hot

coolant

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WARNING Risk of burns from hot com‐

ponent parts in the engine compartment

The engine cooling system is pressurized,

particularly when the engine is warm. If you

open the cap, you could be scalded by hot

coolant spraying out.

Certain components in the engine compart‐

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

radiator and parts of the exhaust system.

#

Let the engine cool down before open‐

ing the cap.

When opening the cap, wear protective

gloves and safety glasses.

#

Allow the engine to cool down and only

touch component parts described in

the following.

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Open the cap slowly to release pres‐

sure.

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WARNING Danger of burns when open‐

ing the hood

If you open the hood when the engine has

overheated or during a fire in the engine

compartment, you could come into contact

with hot gases or other escaping operating

fluids.

#

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.

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Before opening the hood, allow the

engine to cool down.

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Slowly turn cap 1 counter-clockwise to

relieve overpressure.

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In the event of a fire in the engine com‐

partment, keep the hood closed and

call the fire service.

Maintenance and care 427

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Continue turning cap 1 counter-clockwise

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Allow the engine to cool down and only

touch component parts described in

the following.

Make sure that no windshield washer

concentrate spills out next to the filler

opening.

and remove it.

The coolant level is correct in the following

cases:

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WARNING Danger of burns when open‐

ing the hood

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if the engine is cold, up to marker bar 2

if the engine is warm, up to 0.6 in (1.5 cm)

over marker bar 2

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If you open the hood when the engine has

overheated or during a fire in the engine

compartment, you could come into contact

with hot gases or other escaping operating

fluids.

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If necessary, add coolant that has been

approved for Mercedes-Benz.

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Further information on coolant

(/ page 499).

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Before opening the hood, allow the

engine to cool down.

In the event of a fire in the engine com‐

partment, keep the hood closed and

call the fire service.

Adding washer fluid to the windshield

washer system

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WARNING Risk of burns from hot com‐

ponent parts in the engine compartment

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WARNING ‑ Risk of fire and injury from

windshield washer concentrate

Certain components in the engine compart‐

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

radiator and parts of the exhaust system.

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Remove cap 1 by the tab.

Add washer fluid.

Windshield washer concentrate is highly

flammable. It could ignite if it comes into

contact with hot engine component parts or

the exhaust system.

428 Maintenance and care

Keeping the air-water duct free

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the SmartKey is at a minimum distance of

10 ft (3 m) away from the vehicle, otherwise

the tailgate could open unintentionally.

in car washes with a conveyor system: neu‐

tral i is engaged.

NOTE Damage due to unsuitable car

*

wash

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Keep the area between the hood and the

windshield free of deposits, e.g. ice, snow

and leaves.

#

Before driving into a car wash make

sure that the car wash is suitable for

the vehicle dimensions.

% In car washes with a conveyor system: if you

would like to leave the vehicle while it is

being washed, make sure the SmartKey is

located in the vehicle. The park position j

is otherwise automatically engaged.

% If, after the car wash, you remove the wax

from the windshield and wiper rubbers, this

will prevent smearing and reduce wiper

noise.

#

Ensure there is sufficient ground clear‐

ance between the underbody and the

guide rails of the car wash.

Ensure that the clearance width of the

car wash, in particular the width of the

guide rails, is sufficient.

Cleaning and care

Notes on washing the vehicle in a car wash

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WARNING Risk of accident due to

reduced braking effect after washing the

vehicle

The braking effect is reduced after washing

the vehicle.

To avoid damage to your vehicle when using a

car wash, ensure the following beforehand:

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After the vehicle has been washed,

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Active Distance Assist DISTRONIC and the

HOLD function are deactivated.

brake carefully while paying attention to

the traffic conditions until the braking

effect has been fully restored.

Information on using a power washer

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the 360° Camera or the rear view camera is

switched off.

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WARNING Risk of accident when using

high-pressure cleaning equipment with

round-spray nozzles

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the side windows and sliding sunroof are

completely closed.

The water jet from a round-spray nozzle (dirt

grinder) may cause damage to tires and sus‐

pension components that is not visible.

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the blower for the ventilation/heating is

switched off.

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the windshield wiper switch is in position g.

Maintenance and care -> Engine compartment for Your Mercedes GLC Class SUV First Generation (2015-2021)

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