coolant temperature LEXUS RC200T 2017 User Guide

5287-3. Do-it-yourself maintenance
RC200t_RC F_EE(OM24728E)
■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 hybridorganic 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 any authorized Lexus dealer or repairer, or
another duly qualified and equipped professional.
■If the coolant level drops within a short time of replenishing
Visually check the radiator, hoses, engine and intercooler coolant reservoir caps, drain
cock and water pump. If you cannot find a leak, have any authorized Lexus dealer or repairer, or another dulyqualified and equipped professional, test the cap and check for leaks in the cooling sys-
tem.
WARNING
■When the engine is hot (RC200t)
Do not remove the engine coolant reservoir cap, intercooler coolant reservoir cap and radiator cap. ( P. 662)
The cooling system may be under pressure and may spray hot coolant if the cap is removed, causing serious injuries, such as burns.
■When the engine is hot (RC F)
Do not remove the engine coolant reservoir cap. ( P. 662) The cooling system may be under pressure and may spray hot coolant if the cap isremoved, causing serious injuries, such as burns.

5898-2. Steps to take in an emergency
8
When trouble arises
RC200t_RC F_EE(OM24728E)
●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 continually points higher than normal.
●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 fe eling, pedal almost touches the floor
If you think something is wrong
If you notice any of the following symptoms, your vehicle probably needs
adjustment or repair. Contact any authorized Lexus dealer or repairer, or
another duly qualified an d equipped professional as soon as possible.
Visible symptoms
Audible symptoms
Operational symptoms

6028-2. Steps to take in an emergency
RC200t_RC F_EE(OM24728E)
RC200t only
Indicates an engine malfunction A buzzer also sounds.
 Have the vehicle inspected by any authorized Lexus dealer or repairer, or another duly qualified andequipped professional.
Indicates a malfunction in:• The SRS airbag system; or
• The seat belt pretensioner system A buzzer also sounds. Have the vehicle inspected by any authorized Lexus
dealer or repairer, or another duly qualified and equipped professional.
Indicates a malfunction in:•The ABS; or
• The brake assist system A buzzer also sounds. Have the vehicle inspected by any authorized Lexus
dealer or repairer, or another duly qualified and equipped professional.
Indicates that the engine coolant temperature is too highA buzzer also sounds. P. 659
(If equipped)
Indicates that the radar sensor is dirty or covered with ice
A buzzer also sounds.  Clean the sensor.
Warning messageDetails/Actions

6598-2. Steps to take in an emergency
8
When trouble arises
RC200t_RC F_EE(OM24728E)
●The engine coolant temperature gauge (P. 118, 124) is in the red zone or a
loss of engine power is experienced. (F or example, the vehicle speed does not
increase.)
●“Engine Coolant High Temperature” is shown on the multi-information dis-
play.
●Steam comes out from under the hood.
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 any authorized Lexus dealer or repairer, or another duly qualified and equipped professional.
If your vehicle overheats
The following may indicate that your vehicle is overheating.
Correction procedures
1
2
3
1
2
RC200tRC F

6618-2. Steps to take in an emergency
8
When trouble arises
RC200t_RC F_EE(OM24728E)
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 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 fan may not operate in freezing temperatures.)
If the fans are not operating:
Stop the engine immediately and contact any authorized Lexus dealer or
repairer, or another duly qualified and equipped professional.
If the fans are operating:
Have the vehicle inspected at the nearest authorized Lexus dealer or repairer,
or another duly qualified and equipped professional.
5
Engine (RC200t)Engine (RC F)
Intercooler (RC200t)
6
7

6628-2. Steps to take in an emergency
RC200t_RC F_EE(OM24728E)
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.
●RC200t: While the engine and radiators arehot, do not loosen or remove the coolant res-ervoir cap, radiator cap, or intercooler cool-
ant reservoir cap. High temperature steam or coolant couldspray out.
●RC F: While the engine and radiator are hot,do not loosen or remove the coolant reser-voir cap.
High temperature steam or coolant could spray out.

709Alphabetical index
RC200t_RC F_EE(OM24728E)
Emergency, in case of
If a warning buzzer sounds ........... 591
If a warning light turns on................ 591
If a warning message is
displayed ............................................ 597
If the electronic key does not
operate properly ........................... 650
If the engine will not start .............. 648
If the vehicle battery is
discharged.........................................654
If you have a flat tire ............... 619, 633
If you think something
is wrong.............................................. 589
If your vehicle becomes stuck.....664
If your vehicle has to be
stopped in an emergency........... 581
If your vehicle needs to
be towed.............................................582
If your vehicle overheats ............... 659
Engine........................................................ 670
ACCESSORY mode ..................... 248
Compartment...................................... 522
Engine switch....................................... 247
Hood ......................................................... 518
How to start the engine .................. 247
Identification number .......................670
If the engine will not start .............. 648
Ignition switch (engine switch) ... 247
Overheating ........................................ 659
Engine coolant....................................... 527
Capacity................................................. 676
Checking ................................................527
Preparing and checking
before winter.................................... 384
Engine coolant temperature
gauge ....................................................... 124
Engine immobilizer system ................. 92
Engine oil ................................................. 524
Capacity................................................... 671
Checking ............................................... 524
Preparing and checking
before winter.................................... 384
Engine oil maintenance data ........... 526
Engine oil temperature gauge ..........124
Engine switch ..........................................247
EPS (Electric Power Steering) ....... 349
Warning light....................................... 592
Expert mode ........................................... 352