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278 Maintenance and care
Make sure that no antifreeze spills out
#
next to the filler opening.
Thoroughly clean the antifreeze from
#
component parts before starting the
vehicle.
& WARNING Risk of scalding from hot
coolant
If you open the cap when the drive system is
at normal operating temperature, you could
be scalded.
Let the drive system cool down before
#
opening the cap.
When opening the cap, wear protective
#
gloves and safety glasses.
Open the cap slowly to release pres‐
#
sure.
Only check the coolant level and/or fill the cool‐
ant if the vehicle is stationary, on a level surface
and the drive system has cooled down. The cool‐
ant temperature must be below 50°C.
& WARNING Risk of burns from hot com‐
ponent parts in the engine compartment
Certain components in the engine compart‐
ment can be very hot, e.g. drive system and
radiator.
Allow the drive system to cool down and
#
only touch the component parts descri‐
bed below.
If you have to carry out any work in the engine
compartment, touch only the following compo‐
nents:
bonnet
R
washer fluid reservoir cap
R
coolant expansion reservoir cap
R
Coolant contains glycol and is therefore poi‐
#
sonous. Observe the information under
"Operating fluids and capacities"
(
page 314).
/
* NOTE Paintwork damage due to coolant
If coolant gets on painted surfaces, the paint‐
work can be damaged.
Add coolant carefully.
#
Remove spilled coolant.
#
Regularly check the drive cooling system and the
heating system for leaks. If there is a loss of cool‐
ant, have the cause determined and rectified in a
qualified specialist workshop without delay.
Example: cap and coolant expansion reservoir
Checking the coolant level
The vehicle is equipped with two coolant expan‐
sion reservoirs.
Open the bonnet (
/
#
Slowly turn the cap
#
sion reservoir
2
half a turn anti-clockwise
and allow overpressure to escape.
Turn cap
1
further and remove it.
#
The coolant level is correct in the following cases:
if the drive system is cold, up to marker bar
R
3
if the drive system is warm, up to 1.5 cm over
R
marker bar
3
Topping up the coolant
Only use coolant approved for Mercedes-Benz to
avoid damaging the drive cooling system.
Refer to the information on coolant
#
(
page 314).
/
Refill the coolant up to the marker bar
#
the filler opening of the coolant expansion
reservoir 2.
Replace cap
1
and tighten in a clockwise
#
direction.
Start the drive system.
#
Set the temperature in the vehicle interior to
#
the maximum output on the control panel of
the climate control.
page 276).
1
of the coolant expan‐
3
in
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