Mercedes-Benz C-Class Coupe 2019 Operator's Manual page 347

Continue turning cap 1 counter-clockwise
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and remove it.
The coolant level is correct:
If the engine is cold, up to marker bar
R
If the engine is warm, up to 0.6 in (1.5 cm)
R
over marker bar 2
If necessary, add coolant that has been
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approved by Mercedes-Benz.
Further information on coolant
R
( page 416).
/
Adding washer fluid to the windshield
washer system
& 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. the engine, the
radiator and parts of the exhaust system.
Allow the engine to cool down and only
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touch component parts described in the
following.
& WARNING Danger of burns when open‐
ing the hood
If you open the hood when the engine has
overheated or during a fire in the engine
2
compartment, you could come into contact
with hot gases or other escaping operating
fluids.
Before opening the hood, allow the
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engine to cool down.
In the event of a fire in the engine com‐
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partment, keep the hood closed and
call the fire service.
& WARNING ‑ Risk of fire and injury from
windshield washer concentrate
Windshield washer concentrate is highly
flammable. It could ignite if it comes into
contact with hot engine component parts or
the exhaust system.
Make sure that no windshield washer
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concentrate spills out next to the filler
opening.
Maintenance and care 345
Remove cap 1 by the tab.
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Add washer fluid.
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Keeping the air-water duct free
Keep the area between the hood and the
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windshield free of deposits, e.g. ice, snow
and leaves.