120 Engine, exhaust system and fuel › Coolant
Checking the level
Troubleshooting
The fill level must be
within the marked range.
Engine oil pressure too low
flashes, lights up at the same time
If the fill level is below
›
the mark
, top up
Check the engine oil level.
›
the coolant.
The oil level is OK, the warning light continues to
flash:
Stop the engine and seek the help of a specialist
garage.
›
Engine oil level too low
NOTICE
Danger of damage to the engine compartment!
illuminates together with
Message regarding required engine oil top up
Do not top up the coolant above the marked area.
The coolant could be forced out of the cooling sys-
tem when heated.
▶
Check the engine oil level, top up with oil if re-
quired.
›
NOTICE
Engine oil level too high
illuminates together with
Message regarding the need to reduce the
engine oil level
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.
▶
▶
Check the engine oil level.
Refilling
CAUTION
Risk of scalding!
›
The oil level is too high:
Drive on, exercising appropriate caution.
Seek the help of a specialist garage.
›
›
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.
▶
Engine oil level sensor impaired
illuminates together with
Place a rag on the lid of the tank and carefully un-
screw the lid.
Refill with coolant of the correct specification.
Message regarding the engine oil sensor
›
Drive on, exercising appropriate caution.
Seek the help of a specialist garage.
›
›
›
›
Screw on the cap until it clicks into place.
Specification
Use the G12evo (TL 774 L) additive for refilling.
Coolant
NOTICE
Coolant temperature display
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.
Cold area
A
Avoid high engine
speeds.
›
Operating range
B
High temperature
range
C
Troubleshooting
Coolant level is too low
illuminates together with
Message concerning the required coolant
check
Checking the fill level and topping up
Check the coolant level.
›
Test conditions
✓ The vehicle is on a horizontal surface.
✓ The engine is turned off and cooled.
The coolant level is OK:
Check the fuse for radiator fan, replace if re-
›
quired » page 126, Replacing a fuse.
The fuse is OK, the indicator light comes on again:
Stop driving! Seek the help of a specialist garage.
›
English 
