Mercedes-Benz E-Class Sedan Operator's Manual page 311

open the cap, you could be scalded by hot
coolant spraying out.
Let the motor cool down before opening
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the cap.
When opening the cap, wear gloves and
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protective eyewear.
Slowly turn the cap half a turn to allow
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pressure to escape.
Park the vehicle on a flat surface.
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Check the coolant temperature display in the
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instrument cluster.
The coolant temperature must be below
158 °F (70 °C).
Slowly turn cap 1 counter-clockwise to
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relieve overpressure.
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 tes‐
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ted and approved by Mercedes-Benz.
Further information on coolant (
R
Refilling the windshield washer system
& WARNING Risk of burns from hot com‐
ponent parts in the engine compartment
Certain component parts in the engine com‐
partment can be very hot, e.g. the engine,
the cooler and parts of the exhaust system.
Let the engine cool down and only
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touch the component parts described
as follows.
2
& WARNING Danger of burns when open‐
ing the engine hood
If you open the engine hood when the engine
has overheated or during a fire in the engine
compartment, you could come into contact
with hot gases or other escaping operating
page 376)
→
fluids.
Before opening the engine hood, allow
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the engine to cool down.
In the event of a fire in the engine com‐
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partment, keep the engine hood closed
and call the fire service.
Maintenance and care 309