Checking the coolant level
Look at the see−through coolant reser-
voir when the hybrid system is cold.
The coolant level is satisfactory if it is
between the “FULL” and “LOW” lines
on the reservoir. If the level is low, add
ethylene−glycol type coolant for a prop-
er corrosion protection of aluminum
components.
We recommend to use 50% solution for
your Toyota, to provide protection down to
about −35°C (−31°F). When it is extremely
cold, to provide protection down to about
−50°C (−58°F), 60% solution is recom-
mended. Do not use more than 70% solu-
tion for better coolant performance.
CAUTION
To prevent burning yourself, do not
remove the radiator cap when the en-
gine is hot.
Coolant type selection
NOTICE
The coolant level in the reservoir will vary
with hybrid system temperature. However,
if the level is on or below the “LOW” line,
add coolant. Bring the level up to the
“FULL” line.
Use of improper coolants may damage
your cooling system. Your coolant must
contain ethylene−glycol type coolant for a
proper corrosion protection of your hybrid
system that contains aluminum compo-
nents. Use “TOYOTA Long Life Coolant”
or equivalent.
Do not use alcohol type antifreeze or
plain water alone.
Always use ethylene−glycol type coolant
for a proper corrosion protection of alumi-
num components. See information in the
next column.
In addition to preventing freezing and sub-
sequent damage to the hybrid system, this
type of coolant will also prevent corrosion.
Further supplemental inhibitors or additives
are neither needed nor recommended.
If the coolant level drops within a short
time after replenishing, there may be a
leak in the system. Visually check the
radiator, hoses, radiator cap and drain
cock and water pump.
Read the coolant container for information
on freeze protection. Follow the manufac-
turer’s directions for how much to mix
with plain water (preferably demineralized
water of distilled water). The total capacity
of the cooling system is given on page
236 in Section 9.
If you can find no leak, have your Toyota
dealer test the cap pressure and check
for leaks in the cooling system.
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