Volvo V90 Owner's Manual page 619

Coolant expansion tank, left-hand drive car.
Screw off the cap in the plastic cover.
Screw off the cap and top up with coolant
if necessary. The coolant level must not
exceed the yellow MAX mark inside the
expansion tank.
Reinstall the parts in reverse order.
Coolant expansion tank, right-hand drive car.
MAINTENANCE AND SERVICE
Grip the hatch's handle and lift/jiggle the
hatch from the plastic cover.
Screw off the cap and top up with coolant
if necessary. The coolant level must not
exceed the yellow MAX mark inside the
expansion tank.
Reinstall the parts in reverse order.
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