Honda Civic 2016 Manual page 526

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Adding the Coolant
Reserve Tank Cap
1. Make sure the engine and radiator are
cool.
2. Turn the reserve tank cap 1/8 turn
anticlockwise and relieve any pressure in
the coolant system.
3. Push down and turn the reserve tank cap
anticlockwise to remove it.
4. Pour coolant into the reserve tank until it
reaches the MAX mark.
5. Put the reserve tank cap back on, and
tighten it fully.
uuMaintenance Under the BonnetuEngine Coolant
1Adding the Coolant
NOTICE
Pour the fluid slowly and carefully so you do not spill
any. Clean up any spills immediately; they can
damage components in the engine compartment.
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