Volvo S90 Twin Engine Owner's Manual page 591

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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