2008 Lexus GS450h coolant reservoir

420
4-3. Do-it-yourself maintenance
GS_HV_U
December 27, 2007 1:38 pm
Engine compartment
■12 volt battery
P. 4 3 0
Engine oil level dipstick 
( P. 422)
Engine oil filler cap 
( P. 423)
Brake fluid reservoir 
( P. 4 2 9 )
Fuse box ( P. 4 5 6 )Washer fluid tank 
( P. 4 3 4 )
Gasoline engine/power 
control unit coolant 
reservoir ( P. 4 2 7 )
Electric cooling fans
Condenser ( P. 4 2 8 )
Radiator ( P. 4 2 8 )

427
4-3. Do-it-yourself maintenance
4
Maintenance and care
GS_HV_U
December 27, 2007 1:38 pm
CoolantThe coolant level is satisfactory if it is between the “FULL” and “LOW”
lines on the reservoir when the hybrid system is cold.
Reservoir cap
“FULL”
“LOW”
If the level is on or below the
“LOW” line, add coolant up to the
“FULL” line.
■If the coolant level drops within a short time after replenishing
Visually check the radiator, hoses, reservoir cap, radiator cap, drain cock and water
pump. 
If you cannot find a leak, have your Lexus dealer pressure test the cap and check for
leaks in the cooling system.
■Coolant selection
Only use “Toyota Super Long Life Coolant” or similar high quality ethylene glycol
based non-silicate, non-amine, non-nitrite, and non-borate coolant with long-life
hybrid organic acid technology.
U.S.A.: “Toyota Super Long Life Coolant” is a mixture of 50% coolant and 50%
deionized water. (Enabled: -31 F [-35C])
Canada: “Toyota Super Long Life Coolant” is a mixture of 55% coolant and 45% deionized water. (Enabled: -44F [-42 C])
For more details about coolant, contact your Lexus dealer.

428
4-3. Do-it-yourself maintenance
GS_HV_U
December 27, 2007 1:38 pm
Radiator and condenserCheck the radiator and condenser and clear any foreign objects. 
If either of the above parts are extremely dirty or you are not sure of their
condition, have your vehicle checked by your Lexus dealer.
CAUTION
■When the hybrid system is hot
Do not remove the radiator and reservoir cap. 
The cooling system may be under pressure and may spray hot coolant if the cap is
removed, causing burns or other injuries.
NOTICE
■When adding the coolant
Coolant is neither plain water not straight antifreeze. The correct mixture of water
and antifreeze must be used to provide proper lubrication, corrosion protection
and cooling. Be sure to read the antifreeze or coolant label.
■If you spill coolant
Be sure to wash it off with water to prevent it from damaging to parts or paint.
CAUTION
■When the hybrid system is hot
Do not touch the radiator or condenser, as they may be hot and you may be burned.