engine overheat MERCEDES-BENZ GLC 2019 Owners Manual

GWARNING
If you switch off the ignition while driving,
safety-relevant functions are only available
with limitations, or not at all. This could affect,
for example, the power steering and the brake
boosting effect. You will require considerably
more effort to steer and brake. There is a risk
of an accident.
Do not switch off the ignition while driving.
GWARNING
If the parking brake has not been fully
released when driving, the parking brake can:
Roverheat and cause a fire
Rlose its hold function.
There is a risk of fire and an accident. Release
the parking brake fully before driving off.
!Do not warm up the engine while stationary.Pull away immediately. Avoid high enginespeeds and full throttle until the engine hasreached its operating temperature.
In vehicles with automatic transmission,engage positions P and R only when the vehi-cle is stationary.
Where possible, avoid spinning the drivewheels when pulling away on slippery roads.You could otherwise damage the drive train.
!Mercedes-AMG vehicles:at low engine oiltemperatures below 68 ‡ (+20 †), the max-imum engine speed is restricted in order toprotect the engine. To protect the engine andmaintain smooth engine operation, avoid driv-ing at full throttle when the engine is cold.
Key positions
SmartKey
ZTo remove the SmartKey
GPower supply for some consumers, such asthe windshield wipers
HIgnition (power supply for all consumers)and drive position
ITo start the engine
iThe SmartKey can be turned in the ignitionlock even if it is not the correct SmartKey forthe vehicle. The ignition is not switched on.The engine cannot be started.
Start/Stop button
General notes
When you insert the Start/Stop button into theignition lock, the system needs approximatelytwo seconds recognition time. You can then usethe Start/Stop button.
Pressing the Start/Stop button several times insuccession corresponds to the different Smart-Key positions in the ignition lock. This is only thecase if you are not depressing the brake pedal.
If you depress the brake pedal and press theStart/Stop button, the engine starts immedi-ately.
A check which periodically establishes a radioconnection between the vehicle and the Smart-Key determines whether a valid SmartKey is inthe vehicle. This occurs, for example, whenstarting the engine.
Driving131
Driving and parking
Z

This helps you to avoid overheating thebrakes and wearing them out excessively.
When you take advantage of engine braking, adrive wheel may not turn for some time, e.g.on a slippery road surface. This could causedamage to the drive train. This type of damageis not covered by the Mercedes-Benz war-ranty.
Heavy and light loads
GWARNING
If you rest your foot on the brake pedal while
driving, the braking system can overheat. This
increases the stopping distance and can even
cause the braking system to fail. There is a
risk of an accident.
Never use the brake pedal as a footrest. Never
depress the brake pedal and the accelerator
pedal at the same time.
!Depressing the brake pedal constantlyresults in excessive and premature wear tothe brake pads.
If the brakes have been subjected to a heavyload, do not stop the vehicle immediately. Driveon for a short while. This allows the airflow tocool the brakes more quickly.
Wet roads
If you have driven for a long time in heavy rainwithout braking, there may be a delayed reac-tion from the brakes when braking for the firsttime. This may also occur after the vehicle hasbeen washed or driven through deep water.
You have to depress the brake pedal morefirmly. Maintain a greater distance from thevehicle in front.
After driving on a wet road or having the vehiclewashed, brake firmly while paying attention tothe traffic conditions. This will warm up thebrake discs, thereby drying them more quicklyand protecting them against corrosion.
Limited braking performance on salt-
treated roads
If you drive on salted roads, a layer of salt resi-due may form on the brake discs and brakepads. This can result in a significantly longerbraking distance.
RIn order to prevent any salt build-up, apply thebrakes occasionally while paying attention tothe traffic conditions.
RCarefully depress the brake pedal and thebeginning and end of a journey.
RMaintain a greater distance to the vehicleahead.
Servicing the brakes
!The brake fluid level may be too low, if:
Rif the red brake warning lamp lights up inthe instrument cluster and
Ryou hear a warning tone while the engine isrunning
Observe additional warning messages in themultifunction display.
The brake fluid level may be too low due tobrake pad wear or leaking brake lines.
Have the brake system checked immediately.Consult a qualified specialist workshop toarrange this.
!Vehicles with 4MATIC:function or per-formance tests may only be carried out on a 2-axle dynamometer. If you wish to operate thevehicle on such a dynamometer, please con-sult a qualified specialist workshop inadvance. You could otherwise damage thedrive train or the brake system.
!Vehicles with 4MATIC:the ESP®systemoperates automatically. If the electric parkingbrake is tested on a brake dynamometer, theengine and ignition must be switched off: turnthe SmartKey in the ignition lock to position

braking maneuvers. Do not use cruise control orActive Distance Assist DISTRONIC.
If the vehicle threatens to skid or cannot bestopped when moving at low speed:
XShift the transmission to position\\.
The outside temperature indicator is notdesigned to serve as an ice-warning device andis therefore unsuitable for that purpose.Changes in the outside temperature are dis-played after a short delay.
Indicated temperatures just above the freezingpoint do not guarantee that the road surface isfree of ice. The road may still be icy, especially inwooded areas or on bridges. The vehicle couldskid if you fail to adapt your driving style. Alwaysadapt your driving style and drive at a speed tosuit the prevailing weather conditions.
You should pay special attention to road condi-tions when temperatures are around freezingpoint.
For more information on driving with snowchains, see (Ypage 332).
For more information on driving with summertires, see (Ypage 332).
Observe the notes in the "Winter operation" sec-tion (Ypage 332).
Driving systems
Mercedes-Benz Intelligent Drive
Mercedes-Benz Intelligent Drive stands for inno-vative driver assistance and safety systemswhich enhance comfort and support the driver incritical situations. With these intelligent coordi-nated systems Mercedes-Benz has set a mile-stone on the path towards autonomous driving.
Mercedes-Benz Intelligent Drive embraces allelements of active and passive safety in one wellthought out system – for the safety of the vehi-cle occupants and that of other road users.
Further information on driving safety systems(Ypage 65).
Cruise control
General notes
Cruise control maintains a constant road speedfor you. It brakes automatically in order to avoidexceeding the set speed. Change into a lower
gear in good time on long and steep downhillgradients. This is especially important if thevehicle is laden or towing a trailer. By doing so,you will make use of the braking effect of theengine. This relieves the load on the brake sys-tem and prevents the brakes from overheatingand wearing too quickly.
Use cruise control only if road and traffic con-ditions make it appropriate to maintain a steadyspeed for a prolonged period. You can store anyroad speed above 20 mph (30 km/h).
Important safety notes
Cruise control can neither reduce the risk of anaccident if you fail to adapt your driving style noroverride the laws of physics. Cruise control can-not take into account the road, traffic andweather conditions. Cruise control is only anaid. You are responsible for maintaining a safedistance to the vehicle in front, for vehiclespeed, for braking in good time and for staying inlane.
Do not use cruise control:
Rin road and traffic conditions which do notallow you to maintain a constant speed, e.g. inheavy traffic or on winding roads
Ron slippery road surfaces. Braking or accel-erating could cause the drive wheels to losetraction and the vehicle could then skid
Rwhen there is poor visibility, e.g. due to fog,heavy rain or snow
If there is a change of drivers, advise the newdriver of the speed stored.
iThe speed indicated in the speedometermay differ slightly from the speed stored.
Cruise control lever
CActivates or increases speed
DActivates or reduces speed
160Driving systems
Driving and pa rking

Active Distance Assist DISTRONIC
General notes
Active Distance Assist DISTRONIC regulates thespeed and automatically helps you maintain thedistance from the vehicle detected in front.Vehicles are detected with the aid of the radarsensor system. Active Distance AssistDISTRONIC brakes automatically so that the setspeed is not exceeded.
Change into a lower gear in good time on longand steep downhill gradients. This is especiallyimportant if the vehicle is laden. By doing so, youwill make use of the braking effect of the engine.This relieves the load on the brake system andprevents the brakes from overheating and wear-ing too quickly.
If Active Distance Assist DISTRONIC detectsthat there is a risk of a collision with the vehiclein front, you will be warned visually and audibly.Active Distance Assist DISTRONIC cannot pre-vent a collision without your intervention. Anintermittent warning tone will then sound andthe distance warning lamp will light up in theinstrument cluster. Brake immediately in orderto increase the distance to the vehicle in front ortake evasive action provided it is safe to do so.
Active Distance Assist DISTRONIC operates inthe speed range between 0 mph(0 km/h) and120 mph (200 km/h).
Do not use Active Distance Assist DISTRONICwhile driving on roads with steep gradients.
As Active Distance Assist DISTRONIC transmitsradar waves, it can resemble the radar detectorsof the responsible authorities. You can refer tothe relevant chapter in the Operator's Manual ifquestions are asked about this.
iUSA only: This device has been approved bythe FCC as a "Vehicular Radar System". Theradar sensor is intended for use in an auto-motive radar system only. Removal, tamper-ing, or altering of the device will void any war-ranties, and is not permitted by the FCC. Donot tamper with, alter, or use in any non-approved way.
Any unauthorized modification to this devicecould void the user's authority to operate theequipment.
iCanada only: This device complies withRSS-210 of Industry Canada. Operation issubject to the following two conditions:
1. This device may not cause interference,and
2. This device must accept any interferencereceived, including interference that maycause undesired operation of the device.
Removal, tampering, or altering of the devicewill void any warranties, and is not permitted.Do not tamper with, alter, or use in any non-approved way.
Any unauthorized modification to this devicecould void the user's authority to operate theequipment.
Important safety notes
GWARNING
Active Distance Assist DISTRONIC does not
react to:
Rpeople or animals
Rstationary objects in the road, e.g. stopped
or parked vehicles
Roncoming vehicles and crossing traffic
As a result, Active Distance Assist DISTRONIC
may neither give warnings nor intervene in
such situations. There is a risk of an accident.
Always pay careful attention to the traffic sit-
uation and be ready to brake.
GWARNING
Active Distance Assist DISTRONIC cannot
always clearly identify other road users and
complex traffic situations.
In such cases, Active Distance Assist
DISTRONIC can:
Rgive an unnecessary warning and then
brake the vehicle
Rneither give a warning nor intervene
Raccelerate or brake unexpectedly
There is a risk of an accident.
Continue to drive carefully and be ready to
brake, especially if Active Distance Assist
DISTRONIC warns you.
GWARNING
Active Distance Assist DISTRONIC brakes
your vehicle with up to 50% of the maximum
162Driving systems
Driving and parking

which the maximum permissible speed for vehi-cle/trailer combinations is above 60 mph(100 km/h).
When towing a trailer, your vehicle's handlingcharacteristics will be different in comparison towhen driving without a trailer and it will con-sume more fuel.
Shift to a lower gear on long and steep downhillgradients.
This also applies to:
Ractivated DISTRONIC PLUS
Ractivated cruise control
This will use the braking effect of the engine, sothat less braking will be required to maintain thespeed. This relieves the load on the brake sys-tem and prevents the brakes from overheatingand wearing too quickly. If you need additionalbraking, depress the brake pedal repeatedlyrather than continuously.
Driving tips
If the trailer swings from side to side:
XDo not accelerate.
XDo not counter-steer.
XBrake if necessary.
RMaintain a greater distance from the vehiclein front than when driving without a trailer.
RAvoid braking abruptly. If possible, brake gen-tly at first to allow the trailer to run on. Then,increase the braking force rapidly.
RThe values given for gradient-climbing capa-bilities from a standstill refer to sea level.When driving in mountainous areas, note thatthe power output of the engine and, conse-quently, the vehicle's gradient-climbing capa-bility, decreases with increasing altitude.
Installing the ball coupling
GWARNING
If the ball coupling is not correctly installed
and secured, it could come loose while driving
and endanger other road users. There is a risk
of an accident and injury.
Install and secure the ball coupling as descri-
bed in the ball coupling manufacturer's instal-
lation instructions. Make sure that the ball
coupling is correctly installed and secured
before every journey.
GWARNING
If the ball coupling is not installed and secured
correctly the trailer may come loose. There is
a risk of an accident.
Install and secure the ball coupling as descri-
bed in the ball coupling installation instruc-
tions. Make sure that the ball coupling is
installed and secured correctly before every
journey.
XPull protective capCin the direction of thearrow, out of the ball coupling recess.
XStow protective capCso that it cannot bethrown around.
XObserve the manufacturer's installationinstructions.
Observe the loading guidelines (Ypage 278)and the safety notes regarding stowagespaces (Ypage 278).
Coupling up a trailer
!Do not connect the trailer's brake system (iffeatured) to the hydraulic brake system of thetowing vehicle, as the latter is equipped withan anti-lock brake system. Doing so will resultin a loss of function of the brake systems ofboth the vehicle and the trailer.
XApply the vehicle's electric parking brakemanually.
XStart the engine.
XShift the transmission to position].
XVehicles with AIR BODY CONTROL:selecttheComfortdrive program.
204Towing a trailer
Driving and parking

Tachometer
!Do not drive in the overrevving range, as thiscould damage the engine.
The red band in the tachometer indicates theengine's overrevving range.
The fuel supply is interrupted to protect theengine when the red band is reached.
Outside temperature display
You should pay special attention to road condi-tions when temperatures are around freezingpoint.
Bear in mind that the outside temperature dis-play indicates the temperature measured anddoes not record the road temperature.
The outside temperature display is in the multi-function display (Ypage 210).
Changes in the outside temperature are dis-played after a short delay.
Coolant temperature gage
GWARNING
Opening the hood when the engine is over-
heated or when there is a fire in the engine
compartment could 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 a fire in the
engine compartment, keep the hood closed
and contact the fire department.
!If the coolant temperature is too high, a dis-play message is shown.
If the coolant temperature display is in thearea marked in red, do not continue driving.Otherwise, the engine will be damaged.
The coolant temperature gauge is in the lowersection of the tachometer (Ypage 36).
Under normal operating conditions and at thecorrect coolant level, the display may rise to thered mark.
Operating the on-board computer
CMultifunction display
DRight control panel

Display messagesPossible causes/consequences andPPSolutions
Tire Pressure Moni‐Tire Pressure Moni‐tor Inoperative Notor Inoperative NoWheel SensorsWheel Sensors
The wheels mounted do not have a suitable tire pressure sensor. Thetire pressure monitor is deactivated.
XMount wheels with suitable tire pressure sensors.The tire pressure monitor is activated automatically after driving fora few minutes.
TireTirePress.Press.MonitorMonitorInoperativeInoperativeThe tire pressure monitor is faulty.
XVisit a qualified specialist workshop.
Tires OverheatedTires OverheatedThe tire temperature monitoring function is not available in all vehi-cles.
At least one tire has overheated. Affected tires are shown in red. Attemperatures close to the limit value, the tires are shown in yellow.
XDrive more slowly.
Tires OverheatedTires OverheatedDecrease SpeedDecrease SpeedThe tire temperature monitoring function is not available in all vehi-cles.
At least one tire has overheated.
GWARNING
Overheated tires can burst, particularly at high speeds.
XDrive more slowly so that the tires cool down.
Vehicle
Display messagesPossible causes/consequences andPPSolutions
ShiftShifttoto'P''P'oror'N''N'to Start Engineto Start EngineYou have attempted to start the engine with the transmission in posi-tion^or[.
XShift the transmission to position]or\\.
Apply Brake toApply Brake toShift from 'P'Shift from 'P'You have attempted to shift the transmission to position[,^or\\without depressing the brake pedal.
XDepress the brake pedal.
ToToDeselectDeselectPPororN,N,Depress Brake andDepress Brake andStart EngineStart Engine
With the engine switched off, you have attempted to shift the trans-mission out of position]or\\into another transmission position.
XDepress the brake pedal.
XStart the engine.
To Engage Trans‐To Engage Trans‐miss. Position Rmiss. Position RFirst Depress theFirst Depress theBrakeBrake
You have attempted to shift from position[to position^.
XDepress the brake pedal.
XShift the transmission to position^.
252Displaymessages
On-b oard computer and displays

Display messagesPossible causes/consequences andPPSolutions
Stop Vehicle LeaveStop Vehicle LeaveEngineEngineRunningRunningWaitWaitTransmission Cool‐Transmission Cool‐inging
The transmission has overheated. Pulling away can be temporarilyimpaired or not possible.
XPull over and stop the vehicle safely as soon as possible, payingattention to road and traffic conditions. Do not continue drivingunder any circumstances.
XLeave the engine running.
XWait until the display message disappears before pulling away.
eThe tailgate is open
GWARNING
When the engine is running, exhaust gases can enter the vehicle inte-rior if the tailgate is open.
There is a risk of poisoning.
XClose the tailgate.
fThe hood is open. A warning tone also sounds.
GWARNING
The open hood may block your view when the vehicle is in motion.
There is a risk of an accident.
XPull over and stop the vehicle safely as soon as possible, payingattention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 152).
XClose the hood.
QAt least one door is open. A warning tone also sounds.
XClose all the doors.
o
Rear Left BackrestRear Left BackrestNot LatchedNot LatchedorRearRearRight Backrest NotRight Backrest NotLatchedLatched
Vehicle with through-loading feature in the rear bench seat:
The backrest in the rear is not engaged on the left-hand and/or right-hand side.
XPush the backrest back until it engages.
o
Rear Center Back‐Rear Center Back‐rest Not Engagedrest Not Engaged
Vehicle with through-loading facility in the rear compartment:
The center rear seat backrest is not engaged.
XPush the backrest back until it engages.
254Displaymessages
On-b oard computer and displays

Engine compartment
Hood
Important safety notes
GWARNING
If the hood is unlatched, it may open up when
the vehicle is in motion and block your view.
There is a risk of an accident.
Never unlatch the hood while driving. Before
every trip, ensure that the hood is locked.
GWARNING
When opening and closing the hood, it may
suddenly fall into the closed position. There is
a risk 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.
GWARNING
Opening the hood when the engine is over-
heated or when there is a fire in the engine
compartment could 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 a fire in the
engine compartment, keep the hood closed
and contact the fire department.
GWARNING
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 a risk of injury.
If you need to do any work inside the engine
compartment:
Rswitch off the ignition
Rnever reach into the area where there is a
risk of danger from moving components,
such as the fan rotation area
Rremove jewelry and watches
Rkeep items of clothing and hair, for exam-
ple, away from moving parts
To ensure the flow of fresh air through the airvents into the vehicle interior, please observethe following notes (Ypage 128):
Opening the hood
GWARNING
Certain components in the engine compart-
ment, such as the engine, radiator and parts
of the exhaust system, can become very hot.
Working in the engine compartment poses a
risk of injury.
Where possible, let the engine cool down and
touch only the components described in the
following.
GWARNING
When the hood is open and the windshield
wipers are set in motion, you can be injured by
the wiper linkage. There is a risk of injury.
Always switch off the windshield wipers and
the ignition before opening the hood.
!Make sure that the windshield wipers arenot folded away from the windshield. Youcould otherwise damage the windshield wip-ers or the hood.
XMake sure that the windshield wipers areturned off.
XPull release leverCon the hood.The hood is released.
Engine compartment299
Maintenance and care
Z

XReach into the gap, pull hood catch handleDup and lift the hood.
If you lift the hood by approximately 15 in(40 cm), the hood is opened and held openautomatically by the gas-filled strut.
Closing the hood
XLower the hood and let it fall from a height ofapproximately 8 in (20 cm).
XCheck that the hood has engaged properly.If the hood can be raised slightly, it is notproperly engaged. Open it again and close itwith a little more force.
Radiator
Do not cover up the radiator, such as with athermal mat or insect protection cover. Other-wise, the values of the European on-board diag-nostics may be affected. Some of these read-ings are required by law and must be accurate atall times.
Engine oil
Important safety notes
GWARNING
Certain components in the engine compart-
ment, such as the engine, radiator and parts
of the exhaust system, can become very hot.
Working in the engine compartment poses a
risk of injury.
Where possible, let the engine cool down and
touch only the components described in the
following.
GWARNING
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 a risk of injury.
If you need to do any work inside the engine
compartment:
Rswitch off the ignition
Rnever reach into the area where there is a
risk of danger from moving components,
such as the fan rotation area
Rremove jewelry and watches
Rkeep items of clothing and hair, for exam-
ple, away from moving parts
GWARNING
If engine oil comes into contact with hot com-
ponents in the engine compartment, it may
ignite. There is a risk of fire and injury.
Make sure that engine oil is not spilled next to
the filler neck. Let the engine cool down and
thoroughly clean the engine oil off the com-
ponents before starting the engine.
GWARNING
Opening the hood when the engine is over-
heated or when there is a fire in the engine
compartment could 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 a fire in the
engine compartment, keep the hood closed
and contact the fire department.
General notes
Depending on your driving style, the vehicleconsumes up to 0.9 US qt (0.8 l) of oil per600 miles(1,000 km). The oil consumption maybe higher than this when the vehicle is new or ifyou frequently drive at high engine speeds.
Depending on the engine, the oil dipstick may bein a different location.
300Engine compartment
Maintenance and care