Mercedes Benz 2009 M-Class User Manual

The transmission fluid level does not need 
to be checked. If you notice transmission 
fluid loss or gear shifting malfunctions, 
have an authorized Mercedes-Benz Light 
Truck Center check the automatic trans-
mission.

The engine coolant is a mixture of water 
and anticorrosion/antifreeze. To check 
the coolant level, the vehicle must be 
parked on level ground.

The coolant expansion tank is located on 
the driver’s side of the engine compart-
ment.

1 Cap
2 Coolant expansion tank
3 Indicator wall
4 Coolant level

왘

Using a rag, turn cap

1 slowly approx-

imately one half turn counterclockwise 
to release any excess pressure.

G

In order to avoid potentially serious burns:

앫

Use extreme caution when opening the 
hood if there are any signs of steam or 
coolant leaking from the cooling system, 
or if the coolant temperature gauge indi-
cates that the coolant is overheated.

앫

Do not remove pressure cap on coolant 
reservoir if coolant temperature is 
above 158°F (70°C). Allow engine to 
cool down before removing cap. The 
coolant reservoir contains hot fluid and 
is under pressure.

앫

Using a rag, slowly open the cap approx-
imately 

1

/

2 

turn to relieve excess pres-

sure. If opened immediately, scalding 
hot fluid and steam will be blown out un-
der pressure.

앫

Do not spill antifreeze on hot engine 
parts. Antifreeze contains ethylene gly-
col which may burn if it comes into con-
tact with hot engine parts.