2008 Lexus GS350 radiator cap

406
4-3. Do-it-yourself maintenance
GS_G_U
May 13, 2008 5:14 pm
Engine compartment
GS460
Engine oil level dipstick
( P. 4 0 9 )
Engine oil filler cap 
( P. 410)
Brake fluid reservoir 
( P. 4 1 6 )
Fuse box ( P. 4 4 2 )
Washer fluid tank 
( P. 420)Engine coolant reservoir 
( P. 4 1 4 )
Electric cooling fans
Condenser ( P. 415)
Radiator ( P. 415)
Fuse box ( P. 4 4 2 )
12 volt battery ( P. 417)

407
4-3. Do-it-yourself maintenance
4
Maintenance and care
GS_G_U
May 13, 2008 5:14 pm
GS350
Engine oil level dipstick
( P. 4 0 9 )
Engine oil filler cap 
( P. 410)
Brake fluid reservoir (P. 4 1 6 )
Fuse box ( P. 4 4 2 )
Washer fluid tank 
( P. 420)Engine coolant reservoir 
( P. 4 1 4 )
Electric cooling fans
Condenser ( P. 415)
Radiator ( P. 415)
Fuse box ( P. 4 4 2 )
12 volt battery ( P. 417)

414
4-3. Do-it-yourself maintenance
GS_G_U
May 13, 2008 5:14 pm
CoolantThe coolant level is satisfactory if it is between the “FULL” and “LOW”
lines on the reservoir when the engine 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.

415
4-3. Do-it-yourself maintenance
4
Maintenance and care
GS_G_U
May 13, 2008 5:14 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 engine 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 pr event it from damaging to parts or paint.
CAUTION
■When the engine is hot
Do not touch the radiator or condenser, as they may be hot and you may be burned.

534
5-2. Steps to take in an emergency
GS_G_U
May 13, 2008 5:14 pm
■Overheating
In the following situations, your vehicle may be overheating.
●The engine coolant temperature gauge enters the red zone or a loss of power is
experienced.
●Steam is coming from under the hood.
CAUTION
■To prevent an accident or injury when in specting under the hood of your vehicle
●Keep hands and clothing away from the fan and engine drive belt while the
engine is running.
●Do not loosen the radiator cap while the engine and radiator are hot. 
Serious injury, such as burns, may resu lt from hot coolant and steam released
under pressure.
Add coolant if necessary.
Water can be used in an emer-
gency measure if coolant is
unavailable. ( P. 5 4 6 )
Have the vehicle checked at your nearest Lexus dealer as soon as pos-
sible.
STEP6

589
Alphabetical index
GS_G_U
May 13, 2008 5:14 pm
Parking brake ........................................... 131
Parking lightsReplacing light bulbs ....................... 470
Switch ........................................................ 142
Wattage ................................................. 552
Personal lights ....................................... 339
Power outlet ........................................... 353
Power windows.........................................64
Pre-collision system ..............................190
Radar cruise control ............................. 153
Radiator...................................................... 415
Radio ..........................................................229
Radio data system.................................. 231
Rear sunshade........................................357
Rear turn signal lights Replacing light bulbs ....................... 470
Wattage ................................................. 552
Rear view monitor system .................. 179
Rear window defogger .......................225
Replacing Electronic key battery ..................... 440
Fuses .........................................................442
Light bulbs ............................................ 470
Reporting safety defects for 
U.S. owners ......................................... 578
Seat belts Adjusting the seat belt ....................... 53
Automatic locking retractor............ 55
Child restraint system 
installation ............................................ 102
Cleaning and maintaining 
the seat belts..................................... 392
Emergency locking retractor ......... 55
How to wear your seat belt............. 53 How your child should wear

the seat belt ..........................................56
Pre-collision seat belts .......................55
Pregnant women, 
proper seat belt use .........................55
Reminder light .................................... 490
Seat belt extenders ..............................56
Seat belt pretensioners ...................... 54
Seat heaters/ventilators.....................355
Seating capacity ..................................... 198
Seats Adjustment ............................................... 45
Adjustment precautions .................... 46
Child seats/child restraint 
system installation............................ 102
Cleaning .................................................. 391
Driver’s seat position memory ....... 47
Head restraint ...........................................51
Properly sitting in the seat ................ 78
Seat heaters ..........................................354
Service reminder indicators ............. 136
Shift lever Automatic transmission ................... 125
If the shift lever cannot be 
shifted from “P” ................................524
Shift lock system .................................... 524
Shopping bag hooks............................360
Side airbags............................................... 80
Side marker lights Switch.........................................................142
Side mirror Adjusting and folding.......................... 62
Mirror position memory .................... 47P
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