Volkswagen Golf GTI 2016, Owner'S Manual

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Only refill coolant if there is coolant in the expansion tank. If there
is no coolant visible in the expansion tank, the engine could be
damaged. If you cannot see any coolant in the expansion tank, do
not drive the vehicle. Seek professional assistance.
If you can see coolant in the expansion tank, refill coolant until the
level remains stable.
The engine coolant level must be inside the marks on the side of
the expansion tank → Fig. 193 . Do not fill above the top edge of
the filling range! →
Screw the lid tightly.
Even in an emergency, do not use any other kind of coolant
additive if engine coolant that meets Volkswagen specifications
( → Engine coolant specifications ) is not available! Instead, add
distilled water only → . As soon as possible, have the correct
coolant ratio restored using engine coolant that meets
Volkswagen specifications → Engine coolant specifications .
Hot steam and hot engine coolant can cause serious burns.
Never open the hood if you see steam or coolant escaping
from the engine compartment. Always wait until you no longer
see or hear steam or coolant escaping from the engine.
Always let the engine cool down completely before carefully
WARNING