Acura 2011 RL Owner's Manual page 468

Engine Coolant
1. Lift up the lid on the front
bulkhead cover from the front.
462
LID
2. When the radiator and engine are
cool, relieve any pressure in the
cooling system by turning the
radiator cap counterclockwise,
without pressing down.
3. Remove the radiator cap by
pushing down and turning
counterclockwise.
4.
RADIATOR CAP
5.
The coolant level should be up to
the base of the filler neck. Add
coolant if it is low.
Pour the coolant slowly and
carefully so you do not spill any.
Clean up any spill immediately; it
could damage components in the
engine compartment.
Put the radiator cap back on, and
tighten it fully.