Mercedes-Benz 2003 S 430 Operator's Manual page 269

The coolant expansion tank is located on
the passenger side of the engine compart-
ment.
1 Coolant expansion tank
Using a rag, turn the cap slowly approx-
imately one half turn to the left to re-
lease any excess pressure.
Continue turning the cap to the left and
remove it.
The coolant level is correct if the level
for cold coolant: reaches the black top
part of the reservoir
for warm coolant: is approximately
0.6 in. (1.5 cm) higher
Add coolant as required.
Replace and tighten cap.
More information on coolant can be found
in the "Technical data" section
( page 357).
Operation
Engine compartment
269