2017 Lexus GS F cooling

3985-2. Using the air conditio ning system and defogger
GS350_200t_GS F_OM_OM30F83E_(EE)
Adjust the left-hand side temperature setting
Select the air flow to the feet and operate the windshield defogger
Adjust the fan speed setting
Select the air flow mode* (the front seats)
Function on/off indicators on the option control screen
Display the option control screen ( P. 399)
Adjust the right-hand side temperature setting
Fan speed mode selector for automatic mode
Adjust the temperature for the driver’s and front passenger’s seats sepa-
rately (DUAL mode) ( P. 397)
Set cooling and dehumidification function on/off
Select to set automatic mode on/off
Select the air flow mode *
(the left-hand side)
Select the air flow mode * (the right-hand side)
Display the rear air conditioning operation screen ( P. 400)
Adjust the temperature for the driver’s, front passenger’s and rear seats (  P. 408) separately (3-ZONE mode) ( P. 397)
To adjust or select settings, move the Remote Touch knob to select the
screen button, and then press the Remote Touch knob or the “ENTER” but-
ton of Remote Touch to enter the selected function.
Control screen
Without rear air conditioning systemWith rear air conditioning system
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4005-2. Using the air conditio ning system and defogger
GS350_200t_GS F_OM_OM30F83E_(EE)
■Side display (vehicles with 12.3-inch display)
Adjust the left-hand side temperature setting
Select the air flow mode (the front seats)
Adjust the fan speed setting
Adjust the right-hand side temperature setting
Adjust the temperature for the driver’s and front passenger’s seats sepa-
rately (DUAL mode) ( P. 397)
Set cooling and dehumidification function on/off
Select to set automatic mode on/off
Select the air flow mode (the left-hand side)
Select the air flow mode (the right-hand side)
Adjust the temperature for the driver’s, front passenger’s and rear seats (  P. 408) separately (3-ZONE mode) ( P. 397)
■Rear air conditioning control screen (with rear air conditioning system)
Adjust the rear seat temperature
setting
Disabling the switches on the rear
armrest
Turn the fan off (rear seat)
Select to set automatic mode on/
off (rear seat)
Without rear air conditioning systemWith rear air conditioning system
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5-2. Using the air conditioning system and defogger
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Interior features
GS350_200t_GS F_OM_OM30F83E_(EE)
■Outside/recirculated air mode
●When driving on dusty roads su ch as tunnels or in heavy traffic, set the outside/recircu-
lated air mode button to the recirculated air mode. This is effective in preventing out-
side air from entering the vehicle interior. During cooling operation, setting the
recirculated air mode will also cool the vehicle interior effectively.
●Outside/recirculated air mode may automatically switch depending on the tempera-
ture setting or the inside temperature.
■Automatic mode for air intake control
In automatic mode, the system detects exhaust gas and other pollutants and automati-
cally switches between outside air and recirculated air modes.
When the dehumidification function is off, and the fan is operating, turning automatic
mode on will activate the dehumidification function.
■Operation of the air conditioning system in Eco drive mode
In the Eco drive mode, the air conditioning system is controlled as follows to prioritize
fuel efficiency:
●Engine speed and compressor operation controlled to restrict heating/cooling capac- ity
●Fan speed restricted when automatic mode is selected
To improve air conditioning performanc e, perform the following operations:
●Adjust the fan speed
●Turn off Eco drive mode (P. 358)
■When the S-FLOW mode operates
If air flows to the driver’s seat only, the temperature setting for the front passenger’s seat
is not displayed.
■When the outside temperature is low
The dehumidification function may not operate even when “A/C” on the option control
screen is selected.
■Ventilation and air conditioning odors
●To let fresh air in, set the air conditioning system to the outside air mode.
●During use, various odors from inside and outside the vehicle may enter into and accu-
mulate in the air conditioning system. This may then cause odor to be emitted from the
vents.
●To reduce potential odors from occurring:

4506-3. Do-it-yourself maintenance
GS350_200t_GS F_OM_OM30F83E_(EE)
WARNING
The engine compartment contains many mech anisms and fluids that may move suddenly,
become hot, or become electrically energize d. To avoid death or serious injury, observe
the following precautions.
■When working on the engine compartment
●Keep hands, clothing and tools away from the moving fan and engine drive belt.
●Be careful not to touch the engine, radiator, exhaust manifold, etc. right after driving
as they may be hot. Oil and other fluids may also be hot.
●Do not leave anything that may burn easily, such as paper and rags, in the engine
compartment.
●Do not smoke, cause sparks or expose an open flame to fuel or the b attery. Fuel or
the battery fumes are flammable.
●Be extremely cautious when working on the battery. It contains poisonous and corro-
sive sulfuric acid.
●Take care because brake fluid can harm your hands or eyes and damage painted sur-
faces. If fluid gets on your hands or in your eyes, flush t he affected area with clean
water immediately. If you still experience discomfort, consult a doctor.
■When working near the electric cooling fans or radiator grille
Be sure the engine switch is off.
With the engine switch in IGNITION ON mode, the electric cooling fans may auto-
matically start to run if the air conditioning is on and/or the coolant temperature is high.(  P. 466)
■Safety glasses
Wear safety glasses to prevent flying or falling material, fluid spray, etc. from getting in
your eyes.
NOTICE
■If you remove the air cleaner filter
Driving with the air cleaner filter removed may cause excessive engine wear due to dirt
in the air.
■If the fluid level is low or high
It is normal for the brake fluid level to go down slightly as the brake pads wear or when
the fluid level in the accumulator is high.
If the reservoir needs frequent refillin g, it may indicate a serious problem.

4546-3. Do-it-yourself maintenance
GS350_200t_GS F_OM_OM30F83E_(EE)
Engine compartment
GS350
Fuse boxes (P. 493)
Battery ( P. 466)
Engine oil level dipstick( P. 459)
Engine coolant reservoir ( P. 464) Engine oil filler cap (
P. 461)
Washer fluid tank ( P. 470)
Electric cooling fans
Condenser ( P. 466)
Radiator ( P. 466)1
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6-3. Do-it-yourself maintenance
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Maintenance and care
GS350_200t_GS F_OM_OM30F83E_(EE)
GS200t
Fuse boxes ( P. 493)
Battery ( P. 466)
Intercooler coolant reservoir ( P. 465)
Engine oil level dipstick( P. 459)
Engine oil filler cap ( P. 461) Engine coolant reservoir
( P. 464)
Washer fluid tank ( P. 470)
Condenser ( P. 466)
Electric cooling fans
Radiator ( P. 466)1
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4566-3. Do-it-yourself maintenance
GS350_200t_GS F_OM_OM30F83E_(EE)
GS F
For right-hand drive vehicles:
The battery and the fuse box in front of the battery are located on the opposite
side of the engine compartment.
Fuse boxes ( P. 493)
Battery ( P. 466)
Engine oil level dipstick( P. 459)
Engine coolant reservoir ( P. 464) Engine oil filler cap (
P. 461)
Washer fluid tank ( P. 470)
Electric cooling fans
Condenser ( P. 466)
Radiator ( P. 466)1
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6-3. Do-it-yourself maintenance
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Maintenance and care
GS350_200t_GS F_OM_OM30F83E_(EE)
■Intercooler coolant reservoir (GS200t only)
Reservoir cap
“F” line
“L” line
If the level is on or below the “L” line,
add coolant up to the “F” line. (  P. 602)
■Coolant selection
Only use “Toyota Super Long Life Coolant” or a similar high quality ethylene glycol
based non-silicate, non-amine, non-nitrite, and non-borate coolant with long-life hybrid
organic acid technology.
“Toyota Super Long Life Coolant” is a mixt ure of 50% coolant and 50% deionized water.
(Minimum temperature: -35 C [-31 F])
For more details about coolant, contact an y authorized Lexus retailer or Lexus autho-
rized repairer, or any reliable repairer.
■If the coolant level drops within a short time of replenishing
Visually check the radiator, hoses, engine coolant reservoir caps, drain cock and water
pump.
If you cannot find a leak, have any authorized Lexus retailer or Lexus authorized repairer,
or any reliable repairer, test the cap an d check for leaks in the cooling system.
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WARNING
■When the engine is hot
Do not remove the engine coolant reservoi r cap, the intercooler coolant reservoir cap
or the coolant inlet cap. ( P. 606)
The cooling system may be under pressure and may spray hot coolant if the cap is
removed, causing serious injuries, such as burns.
NOTICE
■When adding coolant
Coolant is neither plain water nor straight antifreeze. The correct mixture of water and
antifreeze must be used to provide proper lubrication, corrosion protection and cool-
ing. 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 parts or paint.