2012 Lexus CT200h coolant temperature

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2-2. Instrument cluster
CT200h_OM_OM76067E_(EE)
Customization
Settings (e.g. on/off operation of the ECO lamp) can be changed.
(Customizable features P. 667)
NOTICE
To prevent damage to the engine and its components
Vehicles with tachometer: Do not let the indicator needle of the tachome-
ter enter the red zone, which indicates the maximum engine speed.
The engine may be overheating if the high coolant temperature warning
light comes on or flashes. In this case, immediately stop the vehicle in a
safe place, and check the engine after it has cooled completely. (P. 6 3 9 )

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2-5. Driving information
2
When driving
CT200h_OM_OM76067E_(EE)
Winter driving tips
Carry out the necessary preparations and inspections before driving
the vehicle in winter. Always drive the vehicle in a manner appropriate
to the prevailing weather conditions.
Pre-winter preparations
Use fluids that are appropriate to the prevailing outside
temperatures.
• Engine oil
• Engine/power control unit coolant
• Washer fluid
Have a service technician inspect the condition of the 12-
volt battery.
Have the vehicle fitted with four snow tires or purchase a
set of tire chains for the front tires.
Ensure that all tires are the same size and brand, and that chains
match the size of the tires.

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4-2. Maintenance
4
Maintenance and care
CT200h_OM_OM76067E_(EE)
Does your vehicle need repairs?
Be on the alert for changes in performance and sounds, and visual tip-offs
that indicate service is needed. Some important clues are:
Engine missing, stumbling or pinging
Appreciable loss of power
Strange engine noises
A fluid leak under the vehicle (However, water dripping from the air
conditioning system after use is normal.)
Change in exhaust sound (This may indicate a dangerous carbon monox-
ide leak. Drive with the windows open and have the exhaust system
checked immediately.)
Flat-looking tires, excessive tire squeal when cornering, uneven tire
wear
Vehicle pulls to one side when driven straight on a level road
Strange noises related to suspension movement
Loss of brake effectiveness, spongy feeling brake pedal, pedal almost
touches the floor, vehicle pulls to one side when braking
Engine coolant temperature continually higher than normal
If you notice any of these clues, take your vehicle to any authorized Lexus
dealer or repairer, or another duly qualified and equipped professional as
soon as possible. Your vehicle may need adjustment or repair.
CAUTION
If your vehicle is not properly maintained
Improper maintenance could result in serious damage to the vehicle and
possible serious injury or death.
Handling of the 12-volt battery
12-volt battery posts, terminals and related accessories contain lead and lead
compounds which are known to cause brain damage. Wash your hands after
handling. (P. 508)

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4-3. Do-it-yourself maintenance
CT200h_OM_OM76067E_(EE)
Coolant selection
Only use “Toyota Super Long Life Coolant” or a similar high quality eth-
ylene 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 mixture 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/power control unit coolant reser-
voir caps, drain cock and water pump.
If you cannot find a leak, have any authorized Lexus dealer or repairer, or
another duly qualified and equipped professional test the cap and check for
leaks in the cooling system.
CAUTION
When the hybrid system is hot
Do not remove the engine/power control unit coolant reservoir caps.
The cooling system may be under pressure and may spray hot coolant if the
cap is removed, causing serious injuries, such as burns.

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5-1. Essential information
CT200h_OM_OM76067E_(EE)
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 and equipped professional as soon
as possible.
Visible symptoms
Fluid leaks under the vehicle.
(Water dripping from the air conditioning after use is nor-
mal.)
Flat-looking tires or uneven tire wear
High coolant temperature warning light flashes or comes
on.
Audible symptoms
Changes in exhaust sound
Excessive tire squeal when cornering
Strange noises related to the suspension system
Pinging or other noises related to the hybrid system
Operational symptoms
Engine missing, stumbling or running roughly
Appreciable loss of power
Vehicle pulls heavily to one side when braking
Vehicle p lls hea il to one side hen dri ing on a le el

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5-2. Steps to take in an emergency
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Stop the vehicle immediately.
The following warning indicates the possibility of damage to the
vehicle that may lead to an accident. Immediately stop the vehicle
in a safe place and contact any authorized Lexus dealer or repairer,
or another duly qualified and equipped professional.
Warning lightWarning light/Details
Charging system warning light
Indicates a malfunction in the vehicle’s charging sys-
tem
Low engine oil pressure warning light
Indicates that the engine oil pressure is too low
High coolant temperature warning light
Changes from a flashing to a solid light when the
engine coolant temperature increases

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5-2. Steps to take in an emergency
When trouble arises
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If your vehicle overheats
Correction procedures
If the high coolant temperature warning light comes on or
flashes
Stop the vehicle in a safe place and turn off the air condi-
tioning system, and then stop the hybrid system.
If you see steam:
Carefully lift the hood after the steam subsides.
If you do not see steam:
Carefully lift the hood.
After the hybrid system has
cooled down sufficiently,
inspect the hoses and radiator
core (radiator) for any leaks.
Radiator
Cooling fan
If a large amount of coolant
leaks, immediately contact any
authorized Lexus dealer or
repairer, or another duly quali-
fied and equipped professional.
The following may indicate that your vehicle is overheating:
The high coolant temperature warning light (P. 572) comes
on or flashes, or a loss of hybrid system power is experienced.
(For example, the vehicle speed does not increase.)
“HYBRID SYSTEM OVERHEAT” (P. 586) is shown on
the multi-information display.
Steam comes out from under the hood.
STEP1
STEP2
STEP3

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5-2. Steps to take in an emergency
CT200h_OM_OM76067E_(EE)The coolant level is satisfactory
if it is between the “FULL” and
“LOW” lines on the reservoir.
Reservoir
“FULL”
“LOW”
Add coolant if necessary.
Water can be used in an emer-
gency if coolant is unavailable.
Start the hybrid system and turn the air conditioning system
on to check that the radiator cooling fan operates and to
check for coolant leaks from the radiator or hoses.
The fan operates when the air conditioning system is turned on
immediately after a cold start. Confirm that the fan is 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.)
STEP4
STEP5
STEP6