2019 Lexus GS350 radiator

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GS350_300_OM_OM30G96U_(U)7-2. Steps to take in an emergency
If your vehicle overheats
●The needle of the engine coolant temperature gauge (
P. 92, 98) enters the
red zone or a loss of engine power is experienced. (For example, the vehicle
speed does not increase.)
●“Engine Coolant Temp High Stop in a Safe Place See Owner’s Manual” is
shown on the multi-information display.
●Steam is coming from under the hood.
Stop the vehicle in a safe place and tu rn off the air conditioning system, and
then stop the engine.
If you see steam:
Carefully lift the hood after the steam subsides.
If you do not see steam:
Carefully lift the hood.
After the engine has cooled down sufficiently, inspect the hoses and cooling
core (radiator) for any leaks.
Radiator
Cooling fans
If a large amount of coolant leaks,
immediately contact your Lexus
dealer.
The following may indicate that your vehicle is overheating.
Correction procedures
1
2
3
1
2

5147-2. Steps to take in an emergency
GS350_300_OM_OM30G96U_(U)
Add coolant if necessary.
Water can be used in an emergency if coolant is unavailable.
Start the engine and turn the air conditio ning system on to check that the radi-
ator cooling fans operate and to check for coolant leaks from the radiator or
hoses.
The fans operate when the air conditioning system is turned on immediately after a
cold start. Confirm that the fans are operating by checking the fan sound and air flow.
If it is difficult to check these, turn the air conditioning system on and off repeatedly.
(The fans may not operate in freezing temperatures.)
If the fans are not operating:
Stop the engine immediately an d contact your Lexus dealer.
If the fans are operating:
Have the vehicle inspected at the nearest Lexus dealer.
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GS350GS F
GS300
6
7

5167-2. Steps to take in an emergency
GS350_300_OM_OM30G96U_(U)
WARNING
■When inspecting under the hood of your vehicle
Observe the following precautions.
Failure to do so may result in serious injury such as burns.
●If steam is seen coming from under the h ood, do not open the hood until the steam
has subsided. The engine compartment may be very hot.
●Keep hands and clothing (especially a tie, a scarf or a muffler) away from the fans and
belts. Failure to do so may cause the hands or clothing to be caught, resulting in seri-
ous injury.
●GS350: Do not loosen the coolant inlet cap
or the engine coolant reservoir cap while the
engine and radiator are hot.
High temperature steam or coolant could
spray out.
●GS F: Do not loosen the engine coolant res-
ervoir cap while the engine and radiator are
hot.
High temperature steam or coolant could
spray out.
●GS300: Do not loosen the coolant inlet cap,
the engine coolant rese rvoir cap or the inter-
cooler coolant reservoir cap while the engine
and radiator are hot.
High temperature steam or coolant could
spray out.

595Alphabetical index
GS350_300_OM_OM30G96U_(U)
Radar cruise control (dynamic radar cruise control with
full-speed range) ............................... 266
Radiator .................................................... 390
Radio
*
RBDS (Radio Broadcast Data Systems)
*
Rear air conditioning system ........... 327
Rear door sunshades .......................... 347
Rear personal lights............................. 336
Rear side marker lights ...................... 222 Light switch ........................................... 222
Replacing light bulbs ........................ 422
Welcome light illumination control ......................... 144
Rear seat heaters....................................331
Rear sunshade ....................................... 347 Operation .............................................. 347
Reverse operation feature............ 348 Rear turn signal lights ........................... 216
Replacing light bulbs ....................... 422
Turn signal lever ................................... 216
Rear view mirror Inside rear view mirror...................... 175
Outside rear view mirrors .............. 177
Rear view monitor system
*
Rear window defoggers .....................322
Refueling...................................................234 Capacity................................................. 525
Fuel types............................................... 525
Opening the fuel tank cap ............ 236
When the fuel filler door cannot be opened ..........................237
Remote Touch
*......................................310
Replacing Electronic key battery ....................... 412
Fuses .......................................................... 414
Light bulbs............................................. 420
Tires .......................................................... 475
Rev indicator ..................................... 94, 101
Rev peak ............................................94, 102
Reporting safety defects for U.S. owners .................................. 566
Resetting the message indicating maintenance is required ................ 368
R
*: Refer to the “NAVIGATION AND MULTIMEDIA SYSTEM OWNER’S MANUAL”.