Honda 2005 Odyssey Owner's Manual page 333

Main Menu Table of Contents
Engine Coolant
RADIATOR CAP
1. When the radiator and engine are
cool, relieve any pressure in the
cooling system by turning the
radiator cap counterclockwise,
without pressing down.
2. Remove the radiator cap by
pushing down and turning
counterclockwise.
332
RESERVE TANK
3. 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. Clean up any spill
immediately; it could damage
components in the engine
compartment.
4. Put the radiator cap back on, and
tighten it fully.
5. Pour coolant into the reserve tank.
Fill it to halfway between the MAX
and MIN marks. Put the cap back
on the reserve tank.
Do not add any rust inhibitors or
other additives to your vehicle's
cooling system. They may not be
compatible with the coolant or
engine components.