2018 KIA OPTIMA HYBRID coolant temperature

What to do in an emergency
87
6. If you cannot find the cause of theoverheating, wait until the engine
temperature has returned to nor-
mal. Then, if coolant has been lost,
carefully add coolant to the reser-
voir to bring the fluid level in the
reservoir up to the halfway mark.
7. Proceed with caution, keeping alert for further signs of overheat-
ing. If over heating happens again,
call the nearest authorized Kia
dealer for assistance.
✽ ✽NOTICE
Serious loss of coolant indicates
there is a leak in the cooling system
and should be checked as soon as
possible by an authorized Kia dealer.
CAUTION
When the engine overheats from
low engine coolant, suddenlyadding engine coolant maycause cracks in the engine. Toprevent damage, add enginecoolant slowly in small quantities
WARNING
Do not remove the
radiator cap when the
engine is hot. This
can allow coolant to
blow out of the open-
ing and cause seri-
ous burns.

827
Maintenance
COOLANT
The high-pressure cooling system
has a reservoir filled with year round
antifreeze coolant. The reservoir is
filled at the factory.
Check the antifreeze protection and
coolant level at least once a year: at
the beginning of the winter season,
and before traveling to a colder cli-
mate.Checking the coolant level Turn the engine off and wait until itcools down. Use extreme care
when removing the radiator cap.
Wrap a thick towel around it, and
turn it counterclockwise slowly to
the first stop. Step back while the
pressure is released from the cool-
ing system.
When you are sure all the pressure
has been released, press down on
the cap, using a thick towel, and
continue turning counterclockwise
to remove it.
Even if the engine is not operating, do not remove the radiator cap or
the drain plug while the engine and
radiator are hot. Hot coolant and
steam may still blow out under
pressure, causing serious injury.
The engine coolant and/or inverter
coolant level is influenced by the
hybrid system temperature. Before
checking or refilling the engine
coolant and/or inverter coolant,
turn the hybrid vehicle off.
WARNING
Removing radiator
cap
Never attempt to remove the
radiator cap while the engine is
operating or hot. Doing so
might lead to cooling system
and engine damage and could
result in serious personal injury
from escaping hot coolant or
steam.
CAUTION - Radiator cap
Never attempt to remove theradiator cap while the engine isoperating or hot. Doing somight lead to cooling systemand engine damage.

Maintenance
28
8
Engine coolant
Check the condition and connections
of all cooling system hoses and
heater hoses. Replace any swollen
or deteriorated hoses.
The coolant level should be filled
between F and L marks on the side
of the coolant reservoir when the
engine is cool.
If the coolant level is low, add enough
specified coolant to provide protec-
tion against freezing and corrosion.
Bring the level to F, but do not over-
fill. If frequent additions are required,
see an authorized Kia dealer for a
cooling system inspection.
Inverter coolant
The coolant level should be filled
between MAX and MIN marks on the
side of the coolant reservoir when
the engine is cool.
If the coolant level is low, add enough
specified coolant to provide protec-
tion against freezing and corrosion.
Bring the level to MAX, but do not
overfill. If frequent additions are
required, see an authorized Kia deal-
er for a cooling system inspection.
OJF075006OJFH075186L
WARNING- Cooling fan
Use caution when
working near the
blade of the cooling
fan. The electric
motor (cooling fan) is
controlled by engine coolant
temperature, refrigerant pres-
sure and vehicle speed. it may
sometimes operate even when
the engine is not running.

829
Maintenance
Recommended coolant
When adding coolant, use onlydeionized water or soft water for
your vehicle and never mix hard
water in the coolant filled at the fac-
tory. An improper coolant mixture
can result in serious malfunction or
engine damage.
The engine in your vehicle has alu- minum engine parts and must be
protected by an ethylene-glycol
with phosphate based coolant to
prevent corrosion and freezing.
DO NOT USE alcohol or methanol coolant or mix them with the spec-
ified coolant.
Do not use a solution that contains more than 60% antifreeze or less
than 35% antifreeze. This would
reduce the effectiveness of the
solution. For mixture percentage, refer to the
following table.
Ambient
Temperature Mixture Percentage
(volume)
Antifreeze Water
5°F (-15°C)35 65
-13°F (-25°C)4060
-31°F (-35°C)5050
-49°F (-45°C)6040OJF075007
OJFH075165

Maintenance
54
8
Temperature -A, B & C
The temperature grades are A (the
highest), B and C representing the
tire’s resistance to the generation of
heat and its ability to dissipate heat
when tested under controlled condi-
tions on a specified indoor laboratory
test wheel.
Sustained high temperature can
cause the material of the tire to
degenerate and reduce tire life, and
excessive temperature can lead to
sudden tire failure. The grade C cor-
responds to a level of performance
which all passenger car tires must
meet under the Federal Motor
Vehicle Safety Standard No. 109.
Grades B and A represent higher
levels of performance on the labora-
tory test wheel than the minimum
required by law. Tire terminology and definitions
Air Pressure:
The amount of air
inside the tire pressing outward on
the tire. Air pressure is expressed in
kilopascal (kPa) or pounds per
square inch (psi).
Accessory Weight: This means the
combined weight of optional acces-
sories. Some examples of optional
accessories are, automatic
transaxle, power seats, and air con-
ditioning.
Aspect Ratio: The relationship of a
tire's height to its width.
Belt: A rubber coated layer of cords
that is located between the plies and
the tread. Cords may be made from
steel or other reinforcing materials.
Bead: The tire bead contains steel
wires wrapped by steel cords that
hold the tire onto the rim.
Bias Ply Tire: A pneumatic tire in
which the plies are laid at alternate
angles less than 90 degrees to the
centerline of the tread. Cold Tire Pressure:
The amount of
air pressure in a tire, measured in
kilopascals (kPa) or pounds per
square inch (psi) before a tire has
built up heat from driving.
Curb Weight: This means the weight
of a motor vehicle with standard and
optional equipment including the
maximum capacity of fuel, oil and
coolant, but without passengers and
cargo.
DOT Markings: A code molded into
the sidewall of a tire signifying that
the tire is in compliance with the U.S.
Department of Transportation motor
vehicle safety standards. The DOT
code includes the Tire Identification
Number (TIN), an alphanumeric des-
ignator which can also identify the
tire manufacturer, production plant,
brand and date of production.

8103
Maintenance
Canister
Fuel vapors generated inside the fuel
tank are absorbed and stored in the
onboard canister. When the engine is
running, the fuel vapors absorbed in
the canister are drawn into the surge
tank through the purge control sole-
noid valve.
Purge Control Solenoid Valve(PCSV)
The purge control solenoid valve is
controlled by the Engine Control
Module (ECM); when the engine
coolant temperature is low during
idling, the PCSV closes so that evap-
orated fuel is not taken into the
engine. After the engine warms up
during ordinary driving, the PCSV
opens to introduce evaporated fuel to
the engine.
3. Exhaust emission control system
The Exhaust Emission Control
System is a highly effective system
which controls exhaust emissions
while maintaining good vehicle per-
formance.
Vehicle modifications
This vehicle should not be modified.
Modification of your vehicle could
affect its performance, safety or
durability and may even violate gov-
ernmental safety and emissions reg-
ulations.
In addition, damage or performance
problems resulting from any modifi-
cation may not be covered under
warranty.
If you use unauthorized electronic
devices, it may cause the vehicle to
operate abnormally, wire damage,
battery discharge and fire. For your
safety, do not use unauthorized
electronic devices.
Engine exhaust gas precautions
(carbon monoxide)
Carbon monoxide can be present with other exhaust fumes.
Therefore, if you smell exhaust
fumes of any kind inside your vehi-
cle, have it inspected and repaired
immediately. If you ever suspect
exhaust fumes are coming into
your vehicle, drive it only with all
the windows fully open. Have your
vehicle checked and repaired
immediately.
WARNING - Exhaust
Engine exhaust gases contain
carbon monoxide (CO). Though
colorless and odorless, it is
dangerous and could be lethal if
inhaled. Follow the instructions
on this page to avoid CO poi-
soning.

I5
Index
Display illumination, see instrument panelillumination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-52
Displays, see instrument cluster . . . . . . . . . . . . . . . . . . 4-51
Door locks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-\
13 from outside the vehicle . . . . . . . . . . . . . . . . . . . . . . 4-13
from inside the vehicle . . . . . . . . . . . . . . . . . . . . . . . 4-14
Central door lock switch . . . . . . . . . . . . . . . . . . . . . 4-15
Child-protector rear door lock . . . . . . . . . . . . . . . . . 4-16
Drinks holders, see cup holders . . . . . . . . . . . . . . . . . 4-135
Drive mode integrated control system . . . . . . . . . . . . . 6-73 Hybrid vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-73
ECO (Active ECO) mode. . . . . . . . . . . . . . . . . . . . . 6-73
SPORT mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-74
Driver position memory system . . . . . . . . . . . . . . . . . . 3-11
Driver's and passenger's front air bag . . . . . . . . . . . . . . 3-58
Driver's seat belt warning . . . . . . . . . . . . . . . . . . . . . . . 3-22
Driving at night . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-92
Driving in flooded areas . . . . . . . . . . . . . . . . . . . . . . . . 6-94
Driving in the rain. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-93
Driving off-road . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-94
ECO mode ( Active ECO system) . . . . . . . . . . . . . . . . 6-75
ECO mode (Drive mode integrated control system) . . 6-73
Economical operation . . . . . . . . . . . . . . . . . . . . . . . . . . 6-89
Electric parking brake (EPB) . . . . . . . . . . . . . . . . . . . . 6-21
Electric power steering . . . . . . . . . . . . . . . . . . . . . . . . . 4-42 Electrical equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-14
Electrochromic mirror (ECM) . . . . . . . . . . . . . . . . . . . 4-47
Electronic stability control (ESC) . . . . . . . . . . . . . . . . 6-34
Emergency fuel filler lid release(Hybrid) . . . . . . . . . . . 4-32
Emergency fuel filler lid release(Plug-in Hybrid) . . . . 4-35
Emergency starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5
Jump starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5
Emergency trunk safety release . . . . . . . . . . . . . . . . . . 4-18
Emergency while driving . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Emission control system . . . . . . . . . . . . . . . . . . . . . . . 8-102 Crankcase emission control system . . . . . . . . . . . . 8-102
Evaporative emission control (including ORVR:Onboard Refueling Vapor Recovery) system. . . . 8-102
Exhaust emission control system . . . . . . . . . . . . . . 8-103
Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . \
. . . 9-2
Engine compartment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Engine compartment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
Engine coolant temperature gauge . . . . . . . . . . . . . . . . 4-53
Engine maintenance mode(plug-in hybrid) . . . . . . . . . 8-26 Starting Engine Maintenance Mode. . . . . . . . . . . . . 8-26
Stopping Engine Maintenance Mode . . . . . . . . . . . . 8-26
Engine number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-9
Engine oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-\
24 Checking the engine oil level . . . . . . . . . . . . . . . . . . 8-24
Changing the engine oil and filter . . . . . . . . . . . . . . 8-25
Engine overheats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7
E

I7
Index
Fuel requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . \
. . . 8-60Inner panel fuse replacement . . . . . . . . . . . . . . . . . 8-61
Engine compartment fuse replacement . . . . . . . . . . 8-63
Fuse/relay panel description. . . . . . . . . . . . . . . . . . . 8-66
Gauges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . \
. 4-53 Speedometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-53
Engine coolant temperature gauge . . . . . . . . . . . . . . 4-53
Hybrid System Gauge . . . . . . . . . . . . . . . . . . . . . . . 4-54
Hybrid Battery SOC(State of Charge) Gauge . . . . . 4-54
Plug-in hybrid mode indicator . . . . . . . . . . . . . . . . . 4-55
Fuel Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-55
Odometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-56
Outside Temperature Gauge . . . . . . . . . . . . . . . . . . . 4-57
Glove box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13\
3
Glove box lamp. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-112
Glove box lamp bulb replacement . . . . . . . . . . . . . . . . 8-93
Gross vehicle weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-5
Hazard warning flasher . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Hazardous driving conditions . . . . . . . . . . . . . . . . . . . . 6-91
Headlamp (HID type) bulb replacement (For Hybrid) . 8-82
Headlamp (High beam) bulb replacement (For Hybrid) . 8-84Headlamp (Low beam) bulb replacement (For Hybrid) .
8-83
Headlight (Headlamp) escort function . . . . . . . . . . . . 4-113
Headlight leveling device . . . . . . . . . . . . . . . . . . . . . . 4-106
Headlight position. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-101
Headrest (rear) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
Headrest(front) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
Heated steering wheel. . . . . . . . . . . . . . . . . . . . . . . . . . 4-44
HEV powertrain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
High - beam operation . . . . . . . . . . . . . . . . . . . . . . . . 4-102
High Beam Assist . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-103
High mounted stop lamp bulb replacement . . . . . . . . . 8-90
Highway driving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-94
Hill-start assist control (HAC) . . . . . . . . . . . . . . . . . . . 6-39
Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . \
. . . 4-27
Horn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . \
. . . 4-45
Hybrid Battery SOC(State of Charge) Gauge . . . . . . . 4-54
Hybrid System Gauge. . . . . . . . . . . . . . . . . . . . . . . . . . 4-54
Hybrid vehicle (Drive mode integrated control system) . 6-73
If an accident occurs . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-29
Important safety precautions . . . . . . . . . . . . . . . . . . . . . 3-2
Indicator Lights. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-90
Inside rearview mirror . . . . . . . . . . . . . . . . . . . . . . . . . 4-46
Instrument cluster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-51 Instrument Cluster Control. . . . . . . . . . . . . . . . . . . . 4-52
LCD Display Control . . . . . . . . . . . . . . . . . . . . . . . . 4-52
H
G
I