Honda CLARITY Fuel Cell 2020 Owner's Manual page 462

uuMaintenance Under the HooduInverter Coolant
■
Radiator
MAX
MIN
460
1. Make sure the motor and radiator are
cool.
2. Turn the expansion tank cap 1/8 turn
counterclockwise and relieve any pressure
in the cooling system.
3. Push down and turn the expansion tank cap
counterclockwise to remove it.
Expansion
Tank Cap
4. Pour coolant into the expansion tank until it
reaches the MAX mark.
5. Put the expansion tank cap back on, and
tighten it fully.
Reserve
Tank
1Inverter Coolant
Do not add rust inhibitors or other additives to your
vehicle's cooling system. They may not be compatible
with the coolant or with the motor components.
1Radiator
NOTICE
Pour the fluid slowly and carefully so you do not spill
any. Clean up any spills immediately; they can
damage components in the motor compartment.