2015 Lexus GS350 radiator

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GS350_OM_OM30E15U_(U)
6-3. Do-it-yourself maintenance
Check the radiator and condenser and clear away any foreign objects.
If either of the above parts is extremely dirty or you are not sure of their
condition, have your vehicle inspected by your Lexus dealer.
Radiator and condenser
CAUTION
■When the engine is hot
Do not touch the radiator or condenser as they may be hot and cause serious inju-
ries, such as burns.

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GS350_OM_OM30E15U_(U)
7
When trouble arises
7-2. Steps to take in an emergency
If your vehicle overheats
Stop the vehicle in a safe place and turn 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
radiator 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.
●The needle of the engine coolant temperature gauge ( P. 81) enters
the red zone or a loss of engine power is expe rienced. (For example,
the vehicle speed does not increase.)
●Steam is coming from under the hood.
Correction procedures
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5307-2. Steps to take in an emergency
GS350_OM_OM30E15U_(U)The coolant level is satisfactory if
it is between the “FULL” and “LOW”
lines on the reservoir.
Reservoir
“FULL”
“LOW”
Coolant inlet cap
Add coolant if necessary.
Water can be used in an emergency if
coolant is unavailable.
Start the engine and turn the air conditioning system on to check that
the radiator cooling fa ns 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, tu rn 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 and contact your Lexus dealer.
If the fans are operating:
Have the vehicle inspected at the nearest Lexus dealer.
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5317-2. Steps to take in an emergency
GS350_OM_OM30E15U_(U)
7
When trouble arises
CAUTION
■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 hood, 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 serious injury.
NOTICE
■When adding engine coolant
Add coolant slowly after the engine has cooled down sufficiently. Adding cool
coolant to a hot engine too quickly can cause damage to the engine.
■To prevent damage to the cooling system
Observe the following precautions:
●Avoid contaminating the coolant with foreign matter (such as sand or dust etc.).
●Do not use any coolant additives.
●Do not loosen the cool ant inlet cap or the
coolant reservoir cap while the engine and
radiator are hot.
High temperature steam or coolant could
spray out.

605Alphabetical index
GS350_OM_OM30E15U_(U)
Paddle shift switches ............................ 186
Parking assist sensors (intuitive parking assist)
*
Parking brake...........................................192 If the parking brake cannot be released ....................... 520
Operation ............................................... 192
Parking brake engaged warning buzzer .............................. 489
Parking brake engaged warning message .......................... 489
Parking lights ............................................196 Light switch ............................................ 196
Replacing light bulbs ....................... 455
Welcome light illumination control ......................... 107
PCS (Pre-Collision System) ............ 259 Function ..................................................259
PCS OFF switch ................................. 261
Warning light ....................................... 472
Warning message .......................482, 491, 496
Personal lights........................................ 330
Power easy access system .................136
Power outlets ......................................... 345
Power steering (Electric Power
Steering system) ................................ 250 Warning light .........................................471
Warning message ............................ 485
Power trunk opener and closer ....... 127 Power windows........................................ 151
Door lock linked window operation ...........................153
Jam protection function.................... 152
Operation................................................. 151
Window lock switch ........................... 151
Pre-Collision System (PCS)............ 259 Function .................................................. 259
PCS OFF switch .................................. 261
Warning light ........................................472
Warning message....................... 482, 491, 496
Radar cruise control (dynamic radar cruise control).......................... 219
Radiator.................................................... 404
Radio
*
RBDS (Radio Broadcast Data Systems)
*
Rear air conditioning system............. 321
Rear personal lights ............................ 330
Rear side marker lights ........................ 196 Light switch.............................................196
Replacing light bulbs .......................455
Welcome light illumination control ..........................107
Rear door sunshades.......................... 355
Rear seat heaters ................................. 349
Rear sunshade....................................... 354 Operation.............................................. 354
Reverse operation feature ............355
P
R
*: Refer to the “NAVIGATION AND MULTIMEDIA SYSTEM OWNER’S MANUAL”.