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120 Engine, exhaust system and fuel ›
Checking the level
NOTICE
Danger of damage to the engine compartment!
Do not top up the coolant above the marked area.
▶
The coolant could be forced out of the cooling sys-
tem when heated.
NOTICE
There must be a small quantity of coolant in the tank.
Do not add coolant when the tank is empty.
▶
Stop driving! Seek the help of a specialist garage.
▶
Refilling
CAUTION
Risk of scalding!
The cooling system is pressurised.
Do not open the cap of the coolant expansion tank
▶
while the engine is warm. Let the engine cool
down.
›
Place a rag on the lid of the tank and carefully un-
screw the lid.
›
Refill with coolant of the correct specification.
›
Screw on the cap until it clicks into place.
Specification
Use the G12evo (TL 774 L) additive for refilling.
NOTICE
Risk of damage to the cooling system and the en-
gine!
Adding coolant that does not conform to the correct
specification can reduce the corrosion protection of
the cooling system.
Troubleshooting
Coolant level is too low
illuminates together with
Message concerning the required coolant
check
›
Check the coolant level.
The coolant level is OK:
›
Check the fuse for radiator fan, replace if re-
quired
» page 125, Replacing a
The fuse is OK, the indicator light comes on again:
›
Stop driving! Seek the help of a specialist garage.
Engine electronics
The fill level must be
within the marked range.
›
If the fill level is below
the mark
, top up
the coolant.
fuse.
Coolant temperature too high
illuminates together with
Report regarding the engine overheating
›
Stop driving.
›
Stop the engine and allow it to cool.
›
Drive on after the indicator light goes out.
Engine fault
illuminates together with
›
Stop driving!
›
Stop the engine and seek the help of a specialist
garage.
There is no coolant of the correct specification
available
›
Top up with distilled or demineralised water.
›
Have the correct coolant mixing ratio corrected by
a specialist garage as soon as possible.
Another substance was used for topping up, other
than distilled or demineralised water:
›
Have the coolant changed by a specialist garage.
It is not possible to top up with a sufficient amount
of coolant
›
Stop driving.
›
Stop the engine and seek the help of a specialist
garage.
There is a loss of coolant
›
Top up the coolant and seek the help of a specialist
garage.
Engine electronics
Troubleshooting
Petrol engine control faulty
illuminates
Driving in emergency mode is possible - a
noticeable reduction in engine performance may oc-
cur.
›
Drive on carefully, get the help of a specialist com-
pany.
Particle filter
Troubleshooting
Clogged particle filter
illuminates together with
›
Clean the filter.
When the indicator light is on, it must be as-
sumed that fuel consumption will be higher, engine
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