coolant temperature Lexus GS300 2019 Owner's Manual

GS350_300_OM_OM30G96U_(U)
932. Instrument cluster
2
Instrument cluster
Engine coolant temperature gauge
Displays the engine coolant temperature
Tachometer
Displays the engine speed in revolutions per minute
Outside temperature
Displays the outside temperature within the range of -40F (-40 C) to 122 F
(50 C). Low outside temperature indicator comes on when the ambient temperature
is 37 F (3C) or lower.
Clock
Time displayed is linked to the anal og clock on the instrument panel. (P. 345)
Speedometer
Displays the vehicle speed
Fuel gauge
Displays the quantity of fuel remaining in the tank
Multi-information display
Presents the driver with a variety of driving-related data ( P. 106)
Displays warning me ssages in case of a malfunction ( P. 444)
Odometer, trip meter and maintenance required information display
Odometer:
Displays the total distance the vehicle has been driven
Trip meter:
Displays the distance the vehi cle has been driven since the meter was last reset. Trip
meters “A” and “B” can be used to record and display different distances inde-
pendently.
Maintenance required information: • Displays the maintenance requ ired information when the engine switch is in IGNI-
TION ON mode.
• It can be reset from of th e multi-information display. (P. 106)
Shift position and shift range
Displays the selected shift posi tion or selected shift range (P. 208)
1
2
3
4
5
6
7
8
9

GS350_300_OM_OM30G96U_(U)
972. Instrument cluster
2
Instrument cluster
NOTICE
■To prevent damage to the engine and its components
●Do not let the indicator needle of the tachometer enter the red zone, which indicates
the maximum engine speed.
●The engine may be overheating if the engine coolant temperature gauge is in the red
zone (H). In this case, immediately stop the vehicle in a safe place, and check the
engine after it has cooled completely. ( P. 512)

100
GS350_300_OM_OM30G96U_(U)2. Instrument cluster
Multi-information display
Presents the driver with a variety of vehicle data (
P. 114)
Displays warning me ssages in case of a malfunction ( P. 444)
Fuel gauge
Engine coolant temperature gauge
Displays the engine coolant temperature. If the engine coolant temperature gauge
indicator ( ) enters the red zone, a buzzer will sound and the indicator will turn red
and start flashing. Also, a warning message will be displayed.
Engine oil temperature gauge
Displays the engine oil temperature. If the engine oil temperature gauge indicator
( ) enters the red zone, the indicator will turn red and start flashing.
Outside temperature
Displays the outside temperature within the range of -40°F (-40°C) to 122°F
(50°C). Low outside temperature indicator comes on when the ambient temperature
is 37°F (3°C) or lower.
Tachometer
Displays the engine speed in revolutions per minute
Digital speedometer
Analog speedometer
Shift position and gear position
Displays the selected shift posi tion or selected shift range (P. 208)
Odometer and trip meter display
Odometer:
Displays the total distance the vehicle has been driven
Trip meter:
Displays the distance the vehi cle has been driven since the meter was last reset. Trip
meters “A” and “B” can be used to record and display different distances inde-
pendently.
Eco driving meter
Displays the vehicle acceleration. The more rapidly the vehicle is accelerated, the
lower the number of blue segments displayed, indicating that your driving is less eco-
friendly. This meter is designed as a guideline to show the eco-friendliness of your
driving.
1
2
3
4
5
6
7
8
9
10
11

GS350_300_OM_OM30G96U_(U)
1032. Instrument cluster
2
Instrument cluster
The brightness of the instrument panel lights can be adjusted.
Darker
Brighter
■The meters and display illuminate when
The engine switch is in IGNITION ON mode.
■Welcome illumination of the analog speedometer
●When the driver’s door is opened, the analog speedometer will illuminate.
Then, when the driver’s door is closed, the analog speedometer will illuminate and go
off (pulsate) 3 times.
●In the following situations, the analog sp eedometer will not pulsate even though the
driver’s door is opened and closed:
• Within 60 seconds after the an alog meter pulsation completes
• Within 60 seconds of turning the engine switch off
■Variable red zone
■Eco driving meter
●The number of blue segments displayed on the eco driving meter decreases/increases
depending on the vehicle acceleration. Use this meter as a guideline when you wish to
drive in an eco-friendly manner that reduces fuel consumption.
However, on a downward grade where the ve hicle can accelerate without the acceler-
ator pedal being depressed, the eco driv ing meter may not display the eco-driving
state correctly.
●When the shift lever is moved to P, N or R, the segments will turn gray and the eco driv-
ing meter will not operate.
Instrument panel light control
1
2
To help protect the engine, the engine speed is
controlled by changing the starting position of
the tachometer’s red zone depending on the
engine coolant temperature within a range from
3700 rpm to 7300 rpm.
Before driving under extremely high load condi-
tions, make sure to su fficiently warm up the
engine.

GS350_300_OM_OM30G96U_(U)
1052. Instrument cluster
2
Instrument cluster
NOTICE
■To prevent damage to the engine and its components
●Do not let the indicator of the tachometer enter the red zone, as it represents the
engine speed range which exceeds the maximum safe engine speed.
●In the following situations, th e engine may be overheating. In this case, immediately
stop the vehicle in a safe place, and check the engine after it has cooled completely.
(  P. 512)
• The engine coolant temperature gauge indicator ( ) is in the red zone and flash- ing.
• The engine oil temperature gauge indicator ( ) is in the red zone and flashing.

212
GS350_300_OM_OM30G96U_(U)4-2. Driving procedures
When in the M position, the gear will no
t change unless the shift lever or paddle
shift switches are operated.
However, even when in the M position, the gears will be automatically changed in
the following situation:
●When vehicle speed drops (downshift only).
●When the automatic transmission fluid or engine coolant temperature is low.
●GS350/GS300: When automatic transm ission fluid temperature is high.
●GS350/GS300: When the needle of the tachometer is in the red zone (the
range which exceeds the allowable revs of the engine).
In the following situations, the gear will no t shift even if the shift lever or paddle
shift switches are operated.
●“Slippery Road. Cannot Shift to Lower Ge ar.” is displayed on the multi-infor-
mation display.
●The vehicle speed is low (upshift only).

304
GS350_300_OM_OM30G96U_(U)4-6. Driving tips
Winter driving tips
●Use fluids that are appropriate to
the prevailing outside temperatures.
•Engine oil
• Engine coolant
• Washer fluid
●Have a service technician inspect the condition of the battery.
●Have the vehicle fitted with four snow tires or purchase a set of tire chains for
the rear tires.
*
Ensure that all tires are the specified size and brand, and that chains match the size of
the tires.
*: Tire chains cannot be mounted on vehicles with front and rear tires of differing sizes
and vehicles with LDH and 19-inch tires.
●Use fluids that are appropriate to the prevailing outside temperatures.
•Engine oil
• Engine coolant
• Washer fluid
●Have a service technician inspect the condition of the battery.
●Have the vehicle fitted with four snow tires.
Ensure that all tires are th e specified size and brand.
Carry out the necessary preparations an d inspections before driving the vehi-
cle in winter. Always drive the vehicle in a manner appropriate to the prevail-
ing weather conditions.
Preparation for winter (GS350/GS300)
Preparation for winter (GS F)

374
GS350_300_OM_OM30G96U_(U)6-3. Do-it-yourself maintenance
WARNING
The engine compartment contains many mechan
isms 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 battery. Fuel and
battery fumes are flammable.
●Be extremely cautious when working on the battery. It contains poisonous and corro-
sive sulfuric acid.
■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. 390)
■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 f ilter removed may cause excessive engine wear due to dirt
in the air.

GS350_300_OM_OM30G96U_(U)
3896-3. Do-it-yourself maintenance
6
Maintenance and care
■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.
U.S.A.:
“Toyota Super Long Life Coolant” is a mixt ure of 50% coolant and 50% deionized water.
(Minimum temperature: -31 F [-35 C])
Canada:
“Toyota Super Long Life Cool ant” is a mixture of 55% coolant and 45% deionized water.
(Minimum temperature: -44 F [-42C])
For more details about coolant, contact your Lexus dealer.
■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 your Lexus de aler test the cap and check for leaks in the
cooling system.
WARNING
■When the engine is hot
Do not remove the engine coolant reservoir cap, the intercooler coolant reservoir cap
or the coolant inlet cap. ( P. 516)
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.

435
GS350_300_OM_OM30G96U_(U)
7
When trouble arises
7-2. Steps to take in an emergency
If you think something is wrong
●Fluid leaks under the vehicle.
(Water dripping from the air conditioning after use is normal.)
●Flat-looking tires or uneven tire wear
●Engine coolant temperature gauge needle continually points higher than nor-
mal.
●Changes in exhaust sound
●Excessive tire squeal when cornering
●Strange noises related to the suspension system
●Pinging or other noises related to the engine
●Engine missing, stumbling or running roughly
●Appreciable loss of power
●Vehicle pulls heavily to one side when braking
●Vehicle pulls heavily to one side when driving on a level road
●Loss of brake effectiveness, spongy feeling, pedal almost touches the floor
If you notice any of the following symptoms, your vehicle probably needs
adjustment or repair. Contact your Lexus dealer as soon as possible.
Visible symptoms
Audible symptoms
Operational symptoms