HONDA 2001 Passport - Owner's Manual - Manual (Page 222)

You usually do not need to remove
the radiator cap to check the engine
coolant level.
Adding Engine Coolant
To add engine coolant, remove the
cap on the radiator reserve tank
and fill the tank up to the
maximum level mark. Add a
50/50 mixture of water and a good
quality ethylene glycol antifreeze.
If you need to add engine coolant
frequently, see your Honda dealer
for a cooling system check.
If the proper quality antifreeze
is used, there is no need to add
extra inhibitors or additives. They
may be harmful to the proper
operation of the system.
Cooling System Service
The cooling system should be
serviced at the intervals specified
in the Maintenance Schedule as
follows:
Wash the radiator cap and filler
neck with clean water.
Check the engine coolant level
in the radiator and have it tested
for freeze protection. Add
ethylene glycol antifreeze, if
needed, to maintain freeze
protection at -33°F (-36°C).
Have the cooling system and
radiator cap tested for a
pressure capacity of 15 psi (105
kPa). If a replacement cap is
needed, use a cap specified for
your model.
Tighten all radiator and heater
hose clamps and inspect all
hoses. Replace the hoses if they
are swollen, "checked," or
otherwise worn. Carefully
tighten the hose clamps at the
radiator. Overtightening could
bend or collapse the radiator
fittings.
Clean the front of the radiator
core and air conditioning
condenser.
It is the owner's responsibility to:
Maintain the cooling system
freeze protection at -33°F
Care and Maintenance
Removing the radiator cap
while the engine is hot can
cause the coolant to spray
out, seriously scalding you.
Always let the engine and
radiator cool down before
removing the radiator cap.
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