2019 MERCEDES-BENZ GLA engine overheat

Holding the vehicle stationary on
uphill gradients
GWARNING
If the clutch overheats, the electronic man-
agement system is automatically deactiva-
ted. This interrupts the power transmission.
The vehicle may, for example, roll back-
wards on gradients. There is a risk of an
accident.
Never hold the vehicle stationary on uphill
gradients by depressing the accelerator.
The clutch may overheat if you hold the vehi-cle stationary on uphill gradients by depress-ing the accelerator pedal. If the clutch over-heats, a warning tone sounds.
All vehicles (except Mercedes-AMG vehi-
cles):theStop Vehicle Shift to 'P'Stop Vehicle Shift to 'P'
Leave Engine RunningLeave Engine Runningdisplay messageappears in the multifunction display. You willonly be able to continue your journey once theclutch has cooled down and the display mes-sage in the multifunction display has disap-peared.
Mercedes-AMG vehicles:theTrans. OilTrans. Oil
Overheated Drive on with CareOverheated Drive on with Caredisplaymessage appears in the multifunction display.
Do not hold the vehicle stationary on uphillgradients by depressing the accelerator pedal.Instead, only ever hold the vehicle stationaryon uphill gradients by:
Rdepressing the brake pedal
Ractivating the HOLD function
Rengaging the electric parking brake
Kickdown
Use kickdown for maximum acceleration.
XDepress the accelerator pedal beyond thepressure point.The automatic transmission shifts to a lowergear depending on the engine speed.
XEase off the accelerator pedal once thedesired speed is reached.The automatic transmission shifts back up.
Mercedes-AMG vehicles:it is only possibleto use kickdown in the automatic drive pro-gram and the temporary manual drive programM. When manual drive programMis perma-nently activated, kickdown is not possible.
For further information on kickdown in manualdrive programM(Ypage 142).
Rocking the vehicle free
Shifting back and forth between transmissionpositions[and^can help to free up thevehicle if it gets stuck in mud or snow. Thevehicle's engine management system limitsthe speed to a maximum of 5 mph (9 km/h)when shifting back and forth. To shift repeat-edly between transmission positions[and^, move the DIRECT SELECT lever up anddown past the point of resistance.
Drive programs
All vehicles (except Mercedes-AMG
vehicles)
Drive program C (Comfort)
Drive programCis characterized by the follow-ing:
Rthe vehicle delivers comfortable, economicalhandling characteristics.
Rthe vehicle pulls away more gently inforward and reverse gears, unless the accel-erator pedal is depressed fully.
Rthe vehicle has improved driving stability,for example on slippery road surfaces.
Roptimal fuel consumption resulting from theautomatic transmission shifting up sooner.The vehicle is driven in the low engine speedrange and the wheels are less likely to spin.
Drive program S (Sport)
Drive programSis characterized by the follow-ing:
Rsporty engine settings.
Rthe automatic transmission shifts up later.The fuel consumption possibly being higheras a result of the later automatic transmis-sion shift points.
Drive program I (Individual)
In drive programIthe following properties ofthe drive program can be selected:
Rthe drive (engine and transmission manage-ment)
Rthe steering
138Automatic transmission
Driving and parking

take advantage of engine braking. For thisyou must first activate manual gearshifting.This helps you to avoid overheating thebrakes and wearing them out excessively.
When you take advantage of engine braking,it is possible that a drive wheel will notrotate for some time, e.g. on a slippery roadsurface. This could cause damage to thedrive train. This type of damage is not cov-ered by the Mercedes-Benz warranty.
Briefly depressing the accelerator pedal ondownhill gradients while the manual drive pro-gramMis temporarily activated: the automatictransmission may switch to the last activeautomatic drive programEorS. The automatictransmission may shift to a higher gear. Thiscan reduce the engine's braking effect.
Heavy and light loads
GWARNING
If you rest your foot on the brake pedal
while driving, the braking system can over-
heat. 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.Drive on for a short while. This allows the air-flow to cool 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 vehi-cle washed, brake firmly while paying attentionto the traffic conditions. This will warm up the
brake 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, applythe brakes occasionally while paying atten-tion to the 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 engineis running
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 immedi-ately. Consult a qualified specialist work-shop to arrange this.
!A function or performance test should onlybe carried out on a 2-axle dynamometer. Ifyou wish to operate the vehicle on such adynamometer, please consult a qualifiedspecialist workshop in advance. You couldotherwise damage the drive train or thebrake system.
!As the ESP®system operates automati-cally, the engine and the ignition must beswitched off (the SmartKey must be in posi-tion

RActivate DSR. If this is not sufficient, brakegently. When doing so, make sure that thevehicle is facing in the direction of the lineof fall.
RCheck that the brakes are working normallyafter a long downhill stretch.
Off-road ABS is activated when the off-roadprogram is selected.
At speeds below 18 mph (30 km/h), the frontwheels lock cyclically during braking. The dig-ging-in effect achieved in the process reducesthe stopping distance on off-road terrain. Thesteerability of the vehicle is considerablyreduced if the wheels lock.
Driving systems
Cruise control
General notes
Cruise control maintains a constant roadspeed for you. It brakes automatically in orderto avoid exceeding the set speed. On long andsteep downhill gradients, especially if the vehi-cle is laden, you must select a low gear ingood time. You need to shift manually usingthe steering wheel paddle shifters beforehand.By doing so, you will make use of the brakingeffect of the engine. This relieves the load onthe brake system and prevents the brakesfrom overheating and wearing too quickly.
When the engine is running, you can use thecruise control lever to limit the speed to anyspeed between 20 mph (30 km/h) and thetechnically permitted maximum speed of thevehicle.
Use cruise control if road and traffic condi-tions make it appropriate to maintain a steadyspeed for a prolonged period.
The speed indicated in the speedometer maydiffer slightly from the speed stored.
Important safety notes
If you fail to adapt your driving style, cruisecontrol can neither reduce the risk of an acci-dent nor override the laws of physics. Cruisecontrol cannot take into account the road,traffic and weather conditions. Cruise controlis only an aid. You are responsible for the dis-tance to the vehicle in front, for vehicle speed,
for braking in good time and for staying in yourlane.
Do not use cruise control:
Rin road and traffic conditions which do notallow you to maintain a constant speed, e.g.in heavy 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
Rin poor visibility, e.g. due to fog, heavy rainor snow
If there is a change of drivers, advise the newdriver of the speed stored.
Cruise control lever
CActivates or increases speed
DActivates or reduces speed

sound and the distance warning lamp will lightup in the instrument cluster. Brake immedi-ately in order to increase the distance to thevehicle in front or take evasive action providedit is safe to do so.
Active Distance Assist DISTRONIC operates inthe speed range between 0 mph (0 km/h) and120 mph (200 km/h).
Change into a lower gear in good time on longand steep downhill gradients. This is especiallyimportant if the vehicle is laden. 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.
Do not use Active Distance Assist DISTRONICon roads with steep gradients.
For Active Distance Assist DISTRONIC toassist you when driving, the radar sensor sys-tem must be operational.
As Active Distance Assist DISTRONIC trans-mits radar waves, it can resemble the radardetectors of the responsible authorities. Youcan refer to the relevant chapter in the Opera-tor's Manual if questions are asked about this.
iUSA only: This device has been approvedby the FCC as a "Vehicular Radar System".The radar sensor is intended for use in anautomotive radar system only. Removal,tampering, or altering of the device will voidany warranties, and is not permitted by theFCC. Do not tamper with, alter, or use in anynon-approved way.
Any unauthorized modification to this devicecould void the user's authority to operatethe equipment.
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 thedevice will void any warranties, and is notpermitted. Do not tamper with, alter, or usein any non-approved way.
Any unauthorized modification to this devicecould void the user's authority to operatethe equipment.
Important safety notes
GWARNING
Active Distance Assist DISTRONIC does not
react to:
Rpeople or animals
Rstationary objects in the road, e.g. stop-
ped 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
situation 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
possible deceleration. If this deceleration is
not sufficient, Active Distance Assist
DISTRONIC alerts you with a visual and
acoustic warning. There is a risk of an acci-
dent.
Adjust your speed in these cases and main-
tain sufficient distance.
Apply the brakes yourself and/or take eva-
sive action.
Driving systems159
Driving and parking
Z

The outside temperature display is in the mul-tifunction display (Ypage 191).
There is a short delay before a change in out-side temperature appears in the multifunctiondisplay.
Coolant temperature gauge
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.
!A display message is shown if the coolanttemperature is too high.
If the coolant temperature is over 248 ‡(120 †), do not continue driving. Theengine will otherwise be damaged.
The coolant temperature gage is in the instru-ment cluster on the right-hand side(Ypage 32).
TheHmarking in the coolant temperaturegauge corresponds to a coolant temperatureof approximately 248 ‡ (120 †).
Under normal operating conditions and at thecorrect coolant level, the coolant temperaturegauge may rise to theHmarking.
Operating the on-board computer
Overview
CMultifunction display
DRight control panel

Display messagesPossible causes/consequences andPPSolutions
=
See Operator's Man‐See Operator's Man‐ualual
The battery is not being charged.
A warning tone also sounds.
Possible causes are:
Ra defective alternator
Ra torn poly-V-belt
Ra malfunction in the electronics
!Do not drive any further. Otherwise the engine may overheat.
XPull over and stop the vehicle safely and switch off the engine,paying attention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 145).
XConsult a qualified specialist workshop.
=
Stop Vehicle SeeStop Vehicle SeeOperator's ManualOperator's Manual
The battery is no longer being charged and the condition of chargeis too low.
A warning tone also sounds.
XPull over and stop the vehicle safely and switch off the engine,paying attention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 145).
XObserve the instructions in the display message=See Oper‐See Oper‐ator's Manualator's Manual.
XConsult a qualified specialist workshop.

Display messagesPossible causes/consequences andPPSolutions
Stop Vehicle ShiftStop Vehicle Shiftto P Leave Engineto P Leave EngineRunningRunning
The automatic transmission has overheated.
XDrive on carefully.The automatic transmission is available again when the displaymessage goes out.
If the multifunction display still shows the display message:
XPull over and stop the vehicle safely as soon as possible, payingattention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 145).
XWait until the automatic transmission has cooled down and thedisplay message has disappeared.
Auxiliary BatteryAuxiliary BatteryMalfunctionMalfunctionThe auxiliary battery for the automatic transmission is no longerbeing charged.
XVisit a qualified specialist workshop.
XUntil then, always shift the transmission to position]beforeyou switch off the engine.
XBefore leaving the vehicle, apply the electric parking brake.
Trans. Oil Overhea‐Trans. Oil Overhea‐ted Drive on withted Drive on withCareCare
Mercedes-AMG vehicles: the transmission oil has overheated.
Manual drive programcand the temporarily active manual driveprogram are no longer available. The engine power output isreduced.
XAllow the vehicle to cool down.
4matic Currently4matic CurrentlyUnavailableUnavailable4MATIC has overheated. The vehicle is only driven by the frontwheels.
XDrive on.The airflow cools 4MATIC more quickly.
When the display message goes out, 4MATIC is available againand the vehicle is driven by all four wheels.
4matic Inoperative4matic Inoperative4MATIC is malfunctioning. The vehicle is only driven by the frontwheels.
XVisit a qualified specialist workshop.
eThe tailgate is open
GWARNING
When the engine is running, exhaust gases can enter the vehicleinterior if the tailgate is open.
There is a risk of poisoning.
XClose the tailgate.
Displaymessages227
On-b oard computer and displays
Z

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
GWARNING
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 a
risk of injury.
Never touch components of the ignition sys-
tem or fuel injection system when the igni-
tion is switched on.
To ensure the flow of fresh air through the airvents into the vehicle interior, please observethe following notes (Ypage 123):
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.
Engine compartment273
Maintenance and care
Z