Vauxhall MOVANO Owner's Manual page 146

Freeze protection and corrosion
protection
Before the start of the cold weather season,
have the coolant checked for correct
concentration by a workshop. The amount
of anti-freeze must provide protection up
to approx. –30 °C. If the anti-freeze
concentration is too low, this reduces
protection from freezing and corrosion.
Top up anti-freeze if necessary.
If coolant loss is topped up with water,
have anti-freeze concentration checked
and more anti-freeze added as necessary.
Coolant level
Hardly any losses occur since the cooling
system is sealed and it is thus rarely
necessary to top up the coolant.
The coolant level in the expansion tank
should be slightly above the MIN mark
when the system is cold. It rises at engine
operating temperature and drops again
when the engine cools down. If the level
falls below the MIN mark, the coolant
should be replenished to a little over the
mark.
Service plan, maintenance
9
Warning
Allow engine to cool down before
removing coolant filler cap. Remove filler
cap carefully so that pressure can escape
slowly, otherwise there is a risk of
scalding.
Top up anti-freeze. If no anti-freeze is
available, top up with clean tap water.
If tap water is unavailable, distilled water
can be used.
After topping up with tap or distilled water,
have the anti-freeze concentration
checked, and anti-freeze added if
necessary. Have the cause of the coolant
loss remedied by a workshop.
When closing, tighten coolant filler cap as
far as it will go.
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