KIA Optima Hybrid (2018 year). Manual — part 27

Maintenance

60,000 miles (96,000 km) or 48 months

❑

Inspect vacuum hose

❑

Inspect air conditioning refrigerant

❑

Inspect brake hoses and lines

❑

Inspect drive shafts and boots

❑

Inspect exhaust pipe and muffler

❑

Inspect front brake disc/pads, calipers

❑

Inspect rear brake disc/pads

❑

Inspect steering gear box, linkage & boots/lower arm ball joint,
upper arm ball joint

❑

Inspect suspension mounting bolts

❑

Inspect brake fluid

❑

Inspect fuel cap, fuel lines, fuel hoses and connections

❑

Inspect fuel tank air filter (if equipped) *

❑

Inspect parking brake

❑

Inspect vapor hose and fuel filler cap

❑

Replace climate control air filter (for evaporator and blower unit)

❑

Replace air cleaner filter

❑

Replace engine oil and filter
(60,000 miles (96,000 km) or 96 months)

❑

Replace HSG belt *

(60,000 miles (96,000 km) or 48 months)

❑

Add fuel additive *

(60,000 miles (96,000 km) or 96 months)

❑

Rotate tire position (Every 7,500 miles (12,000 km))

67,500 miles (108,000 km) or 54 months

❑

Inspect air cleaner filter

❑

Inspect HSG belt *

(67,500 miles (108,000 km) or 108 months)

❑

Inspect vacuum hose

❑

Replace engine oil and filter
(67,500 miles (108,000 km) or 108 months)

❑

Add fuel additive *

(67,500 miles (108,000 km) or 108 months)

❑

Rotate tire position (Every 7,500 miles (12,000 km))

Fuel tank air filter are considered to be maintenance free but periodic inspec-
tion is recommended for this maintenance schedule depends on fuel quality.

Inspect HSG belt for evidence of cuts, cracks, excessive wear or oil saturation
and replace if necessary. If HSG belt noise occurred, readjust HSG belt ten-
sion before replace.

If TOP TIER Detergent Gasoline is not available, one bottle of additive is rec-
ommended. Additives are available from your authorized Kia dealer along with
information on how to use them. Do not mix other additives.

❈

Inspect : Inspect and if necessary, adjust, correct, clean or replace.

Normal Maintenance Schedule (CONT.)

8 13

Maintenance

75,000 miles (120,000 km) or 60 months

❑

Inspect air cleaner filter

❑

Inspect HSG belt *

(75,000 miles (120,000 km) or 120 months)

❑

Inspect vacuum hose

❑

Inspect air conditioning refrigerant

❑

Inspect brake hoses and lines

❑

Inspect drive shafts and boots

❑

Inspect exhaust pipe and muffler

❑

Inspect front brake disc/pads, calipers

❑

Inspect rear brake disc/pads

❑

Inspect steering gear box, linkage & boots/lower arm ball joint,
upper arm ball joint

❑

Inspect suspension mounting bolts

❑

Replace climate control air filter (for evaporator and blower unit)

❑

Replace engine oil and filter
(75,000 miles (120,000 km) or 120 months)

❑

Add fuel additive *

(75,000 miles (120,000 km) or 120 months)

❑

Rotate tire position (Every 7,500 miles (12,000 km))

82,500 miles (132,000 km) or 66 months

❑

Inspect air cleaner filter

❑

Inspect HSG belt *

(82,500 miles (132,000 km) or 132 months)

❑

Inspect vacuum hose

❑

Replace engine oil and filter *

(82,500 miles (132,000 km) or 132 months)

❑

Add fuel additive *

(82,500 miles (132,000 km) or 132 months)

❑

Rotate tire position (Every 7,500 miles (12,000 km))

Inspect HSG belt for evidence of cuts, cracks, excessive wear or oil saturation
and replace if necessary. If HSG belt noise occurred, readjust HSG belt ten-
sion before replace.

❈

Inspect : Inspect and if necessary, adjust, correct, clean or replace.

Normal Maintenance Schedule (CONT.)

Maintenance

Normal Maintenance Schedule (CONT.)

97,500 miles (156,000 km) or 78 months

❑

Inspect air cleaner filter

❑

Inspect HSG belt *

(97,500 miles (156,000 km) or 156 months)

❑

Inspect vacuum hose

❑

Replace engine oil and filter
(97,500 miles (156,000 km) or 156 months)

❑

Add fuel additive *

(97,500 miles (156,000 km) or 156 months)

❑

Rotate tire position (Every 7,500 miles (12,000 km))

90,000 miles (144,000 km) or 72 months

❑

Inspect HSG belt *

(90,000 miles (144,000 km) or 144 months)

❑

Inspect vacuum hose

❑

Inspect air conditioning refrigerant

❑

Inspect brake hoses and lines

❑

Inspect drive shafts and boots

❑

Inspect exhaust pipe and muffler

❑

Inspect front brake disc/pads, calipers

❑

Inspect rear brake disc/pads

❑

Inspect steering gear box, linkage & boots/lower arm ball joint,
upper arm ball joint

❑

Inspect suspension mounting bolts

❑

Inspect brake fluid

❑

Inspect fuel cap, fuel lines, fuel hoses and connections

❑

Inspect fuel tank air filter (if equipped) *

❑

Inspect parking brake

❑

Inspect vapor hose and fuel filler cap

❑

Replace climate control air filter (for evaporator and blower unit)

❑

Replace air cleaner filter

❑

Replace engine oil and filter
(90,000 miles (144,000 km) or 144 months)

❑

Add fuel additive *

(90,000 miles (144,000 km) or 144 months)

❑

Rotate tire position (Every 7,500 miles (12,000 km))

Fuel tank air filter are considered to be maintenance free but periodic inspec-
tion is recommended for this maintenance schedule depends on fuel quality.

Inspect HSG belt for evidence of cuts, cracks, excessive wear or oil saturation
and replace if necessary. If HSG belt noise occurred, readjust HSG belt ten-
sion before replace.

❈

Inspect : Inspect and if necessary, adjust, correct, clean or replace.

8 15

Maintenance

105,000 miles (168,000 km) or 84 months

❑

Inspect air cleaner filter

❑

Inspect HSG belt *

(105,000 miles (168,000 km) or 168 months)

❑

Inspect vacuum hose

❑

Inspect air conditioning refrigerant

❑

Inspect brake hoses and lines

❑

Inspect drive shafts and boots

❑

Inspect exhaust pipe and muffler

❑

Inspect front brake disc/pads, calipers

❑

Inspect rear brake disc/pads

❑

Inspect steering gear box, linkage & boots/lower arm ball joint,
upper arm ball joint

❑

Inspect suspension mounting bolts

❑

Replace climate control air filter (for evaporator and blower unit)

❑

Replace spark plugs (iridium coated)

❑

Replace engine oil and filter
(105,000 miles (168,000 km) or 168 months)

❑

Add fuel additive *

(105,000 miles (168,000 km) or 168 months

❑

Rotate tire position (Every 7,500 miles (12,000 km))

112,500 miles (180,000 km) or 90 months

❑

Inspect air cleaner filter

❑

Inspect HSG belt *

(112,500 miles (180,000 km) or 180 months)

❑

Inspect vacuum hose

❑

Replace engine oil and filter
(112,500 miles (180,000 km) or 180 months)

❑

Add fuel additive *

(112,500 miles (180,000 km) or 180 months

❑

Rotate tire position (Every 7,500 miles (12,000 km))

Inspect HSG belt for evidence of cuts, cracks, excessive wear or oil saturation
and replace if necessary. If HSG belt noise occurred, readjust HSG belt ten-
sion before replace.

❈

Inspect : Inspect and if necessary, adjust, correct, clean or replace.

Normal Maintenance Schedule (CONT.)

Maintenance

Normal Maintenance Schedule (CONT.)

120,000 miles (192,000 km) or 96 months

❑

Inspect vacuum hose

❑

Inspect air conditioning refrigerant

❑

Inspect brake hoses and lines

❑

Inspect drive shafts and boots

❑

Inspect exhaust pipe and muffler

❑

Inspect front brake disc/pads, calipers

❑

Inspect rear brake disc/pads

❑

Inspect steering gear box, linkage & boots/lower arm ball joint,
upper arm ball joint

❑

Inspect suspension mounting bolts

❑

Inspect brake fluid

❑

Inspect fuel cap, fuel lines, fuel hoses and connections

❑

Inspect fuel tank air filter (if equipped) *

❑

Inspect parking brake

❑

Inspect vapor hose and fuel filler cap

❑

Replace climate control air filter (for evaporator and blower unit)

❑

Replace air cleaner filter

❑

Replace engine oil and filter
(120,000 miles (192,000 km) or 192 months)

❑

Replace HSG belt *

(120,000 miles (192,000 km) or 96 months)

❑

Replace engine coolant (First, 120,000 miles (192,000 km) or
120 months after every 30,000 miles (48,000 km) or 24 months)

(Continued)

Fuel tank air filter are considered to be maintenance free but periodic inspec-
tion is recommended for this maintenance schedule depends on fuel quality.

Inspect HSG belt for evidence of cuts, cracks, excessive wear or oil saturation
and replace if necessary. If HSG belt noise occurred, readjust HSG belt ten-
sion before replace.

❈

Inspect : Inspect and if necessary, adjust, correct, clean or replace.

127,500 miles (204,000 km) or 102 months

❑

Inspect air cleaner filter

❑

Inspect vacuum hose

❑

Inspect HSG belt *

(127,500 miles (204,000 km) or 204 months)

❑

Replace engine oil and filter
(127,500 miles (204,000 km) or 204 months)

❑

Add fuel additive *

(127,500 miles (204,000 km) or 204 months)

❑

Rotate tire position (Every 7,500 miles (12,000 km))

(Continued)

❑

Replace inverter coolant (First, 120,000 miles (192,000 km) or
120 months after every 30,000 miles (48,000 km) or 24 months)

❑

Add fuel additive *

(120,000 miles (192,000 km) or 192 months)

❑

Rotate tire position (Every 7,500 miles (12,000 km))

8 17

Maintenance

Normal Maintenance Schedule (CONT.)

135,000 miles (216,000 km) or 108 months

❑

Inspect air cleaner filter

❑

Inspect HSG belt *

(135,000 miles (216,000 km) or 216 months)

❑

Inspect vacuum hose

❑

Inspect air conditioning refrigerant

❑

Inspect brake hoses and lines

❑

Inspect drive shafts and boots

❑

Inspect exhaust pipe and muffler

❑

Inspect front brake disc/pads, calipers

❑

Inspect rear brake disc/pads

❑

Inspect steering gear box, linkage & boots/lower arm ball joint,
upper arm ball joint

❑

Inspect suspension mounting bolts

❑

Replace climate control air filter (for evaporator and blower unit)

❑

Replace engine oil and filter
(135,000 miles (216,000 km) or 216 months)

❑

Add fuel additive *

(135,000 miles (216,000 km) or 216 months)

❑

Rotate tire position (Every 7,500 miles (12,000 km))

142,500 miles (228,000 km) or 114 months

❑

Inspect air cleaner filter

❑

Inspect HSG belt *

(142,500 miles (228,000 km) or 228 months)

❑

Inspect vacuum hose

❑

Replace engine oil and filter
(142,500 miles (228,000 km) or 228 months)

❑

Add fuel additive *

(142,500 miles (228,000 km) or 228 months)

❑

Rotate tire position (Every 7,500 miles (12,000 km))

Inspect HSG belt for evidence of cuts, cracks, excessive wear or oil saturation
and replace if necessary. If HSG belt noise occurred, readjust HSG belt ten-
sion before replace.

❈

Inspect : Inspect and if necessary, adjust, correct, clean or replace.

Maintenance

Normal Maintenance Schedule (CONT.)

150,000 miles (240,000 km) or 120 months

❑

Inspect HSG belt *

(150,000 miles (240,000 km) or 240 months)

❑

Inspect vacuum hose

❑

Inspect air conditioning refrigerant

❑

Inspect brake hoses and lines

❑

Inspect drive shafts and boots

❑

Inspect exhaust pipe and muffler

❑

Inspect front brake disc/pads, calipers

❑

Inspect rear brake disc/pads

❑

Inspect steering gear box, linkage & boots/lower arm ball joint,
upper arm ball joint

❑

Inspect suspension mounting bolts

❑

Inspect brake fluid

❑

Inspect fuel cap, fuel lines, fuel hoses and connections

❑

Inspect fuel tank air filter (if equipped) *

❑

Inspect parking brake

❑

Inspect vapor hose and fuel filler cap

❑

Replace climate control air filter (for evaporator and blower unit)

❑

Replace air cleaner filter

❑

Replace engine oil and filter
(150,000 miles (240,000 km) or 240 months)

(Continued)

❑

Replace engine coolant (First, 120,000 miles (192,000 km) or
120 months after every 30,000 miles (48,000 km) or 24 months)

❑

Replace inverter coolant (First, 120,000 miles (192,000 km) or
120 months after every 30,000 miles (48,000 km) or 24 months)

❑

Add fuel additive *

(150,000 miles (240,000 km) or 240 months)

❑

Rotate tire position (Every 7,500 miles (12,000 km))

No check, No service required

❑

Automatic transmission fluid (if equipped)

Fuel tank air filter are considered to be maintenance free but periodic inspec-
tion is recommended for this maintenance schedule depends on fuel quality.

Inspect HSG belt for evidence of cuts, cracks, excessive wear or oil saturation
and replace if necessary. If HSG belt noise occurred, readjust HSG belt ten-
sion before replace.

❈

Inspect : Inspect and if necessary, adjust, correct, clean or replace.

8 19

Maintenance

Maintenance Under Severe Usage Conditions

Severe Driving Conditions
A - Repeatedly driving short distance of less than 5 miles (8 km) in normal

temperature or less than 10 miles (16 km) in freezing temperature

B - Extensive engine idling or low speed driving for long distances
C - Driving on rough, dusty, muddy, unpaved, graveled or salt- spread roads
D - Driving in areas using salt or other corrosive materials or in very cold

weather

E - Driving in heavy dust condition.

F - Driving in heavy traffic area.
G - Driving on uphill, downhill, or mountain roads repeatedly.
H - Towing a trailer or using a camper on roof rack.
I - Driving for patrol car, taxi, other commercial use of vehicle towing.
J - Driving over 106 mph (170 km/h).
K - Frequently driving in stop-and-go conditions.

The following items must be serviced more frequently on cars normally used under severe driving conditions. Refer

to the chart below for the appropriate maintenance intervals.
R : Replace I : Inspect and, after inspection, clean, adjust, repair or replace if necessary

MAINTENANCE ITEM

MAINTENANCE

OPERATION

MAINTENANCE INTERVALS

DRIVING CONDITION

Engine oil and filter

Every 3,750 miles (6,000 km) or 6 months

A, B, C, D, E, F, G,
H, I, J, K

Air cleaner filter

More frequently

C, E

Spark plugs

More frequently

B, H

Automatic transmission fluid

Every 60,000 miles (96,000 km)

A, C, D, E, F, G, H, I, K

HSG (Hybrid Starter & Generator) belt

Every 30,000 miles (48,000 km) or 24 months

C, D, E, K

Every 3,750 miles (6,000 km) or 6 months

C, D, E, K

Front brake disc/pads, calipers

More frequently

C, D, G, H

Rear brake disc/pads

More frequently

C, D, G, F

Parking brake

More frequently

C, D, G, H

Steering gear box, linkage & boots/lower arm ball joint,
upper arm ball joint

More frequently

C, D, E, F, G, H, I

Drive shafts and boots

Every 7,500 miles (12,000 km) or 6 months

C, D, E, F, G, H, I, J

Climate control air filter (for evaporator and blower unit)

More frequently

C, E

Suspension mounting bolts

More frequently

C, D, E, F, G, H, I

Maintenance

EXPLANATION OF SCHEDULED MAINTENANCE ITEMS

Engine oil and filter

The engine oil and filter should be
changed at the intervals specified in
the maintenance schedule. If the
vehicle is being driven in severe con-
ditions, more frequent oil and filter
changes are required.

HSG (Hybrid starter & genera-
tor) belt

The HSG belt should be changed at
the intervals specified in the mainte-
nance schedule.

Fuel filter (for gasoline)

Kia gasoline vehicle is equipped a
lifetime fuel filter that integrated with
the fuel tank. Regular maintenance
or replacement is not needed but
depends on fuel quality. If there are
some important safety matters like
fuel flow restriction, surging, loss of
power, hard starting problem etc, fuel
filter inspection or replace is needed.
The fuel filter be Inspected or
replaced by an authorized Kia dealer.

Fuel lines, fuel hoses and con-
nections

Check the fuel lines, fuel hoses and
connections for leakage and dam-
age. Have an authorized Kia dealer
replace any damaged or leaking
parts immediately.

Vapor hose and fuel filler cap

The vapor hose and fuel filler cap
should be inspected at those inter-
vals specified in the maintenance
schedule. Make sure that a new
vapor hose or fuel filler cap is cor-
rectly replaced.

Vacuum crankcase ventilation
hoses

Inspect the surface of hoses for evi-
dence of heat and/or mechanical
damage. Hard and brittle rubber,
cracking, tears, cuts, abrasions, and
excessive swelling indicate deterio-
ration. Particular attention should be
paid to examine those hose surfaces
nearest to high heat sources, such
as the exhaust manifold.
Inspect the hose routing to assure
that the hoses do not come in con-
tact with any heat source, sharp
edges or moving component which
might cause heat damage or
mechanical wear. Inspect all hose
connections, such as clamps and
couplings, to make sure they are
secure, and that no leaks are pres-
ent. Hoses should be replaced
immediately if there is any evidence
of deterioration or damage.

8 21

Maintenance

Air cleaner filter

A Genuine Kia air cleaner filter is
recommended when the filter is
replaced.

Spark plugs

Make sure to install new spark plugs
of the correct heat range.

Cooling system

Check the cooling system compo-
nents, such as the radiator, coolant
reservoir, hoses and connections for
leakage and damage. Replace any
damaged parts.

Coolant (Engine / Inverter)

The coolant should be changed at
the intervals specified in the mainte-
nance schedule.

Automatic transaxle fluid

Automatic transaxle fluid should not
be checked under normal usage
conditions.
But in severe conditions, the fluid
should be changed at an authorized
Kia dealer in accordance to the
scheduled maintenance at the begin-
ning of this chapter.

✽

NOTICE

Automatic transaxle fluid color is
basically red.
As the vehicle is driven, the auto-
matic transaxle fluid will begin to
look darker.
It is normal condition and you should
not judge the need to replace the fluid
based upon the changed color.

Brake hoses and lines

Visually check for proper installation,
chafing, cracks, deterioration and
any leakage. Replace any deteriorat-
ed or damaged parts immediately.

CAUTION

Use only specified automatic
transaxle fluid. The use of a non-
specified fluid could result in a
transaxle malfunction and fail-
ure. (Refer to "Recommended
lubricants and capacities" in
chapter 9.)

Maintenance

✽

NOTICE -

NHTSA Safety
Corrosion Alert

NHTSA has warned all vehicle own-
ers of all brands that they must main-
tain their vehicles in a manner which
will prevent brake hose and brake line
failures due to corrosion when such
vehicles are exposed to winter road
salt and related chemicals. While seri-
ous corrosion conditions typically only
manifest themselves as safety issues
after 7 years of vehicle use, the corro-
sion process starts immediately and
thus underbody cleaning maintenance
must commence from your vehicle's
first exposure to road salts and chem-
icals. NHTSA urges vehicle owners to
take the following steps to prevent
corrosion:

(Continued)

(Continued)
1. Wash the undercarriage of your

vehicle regularly throughout the
winter and do a thorough washing
in the spring to remove road salt
and other de-icing chemicals.

2. Monitor the brake system for

signs of corrosion by having regu-
lar professional inspections and
watching for signs of problems,
including loss of brake fluid,
unusual leaks and soft or spongy
feel in the brake pedal.

3. Replace the entire brake pipe

assembly if you find severe corro-
sion that causes scaling or flaking
of brake components.

Brake fluid

Check the brake fluid level in the
brake fluid reservoir. The level should
be between “MIN” and “MAX” marks
on the side of the reservoir. Use only
hydraulic brake fluid conforming to
DOT 3 or DOT 4 specification.

Parking brake

Inspect the parking brake system
including the parking brake pedal
and cables.

Brake discs, pads, calipers
and rotors

Check the pads for excessive wear,
discs for run out and wear, and
calipers for fluid leakage.

8 23

Maintenance

Exhaust pipe and muffler

Visually inspect the exhaust pipes,
muffler and hangers for cracks, dete-
rioration, or damage. Start the
engine and listen carefully for any
exhaust gas leakage. Tighten con-
nections or replace parts as neces-
sary.

Suspension mounting bolts

Check the suspension connections
for looseness or damage. Retighten
to the specified torque.

Steering gear box, linkage &
boots/lower arm ball joint

With the vehicle stopped and engine
off, check for excessive free-play in
the steering wheel.
Check the linkage for bends or dam-
age. Check the dust boots and ball
joints for deterioration, cracks, or
damage. Replace any damaged
parts.

Drive shafts and boots

Check the drive shafts, boots and
clamps for cracks, deterioration, or
damage. Replace any damaged
parts and, if necessary, repack the
grease.

Air conditioning refrigerant

Check the air conditioning lines and
connections for leakage and dam-
age.

When checking engine oil, engine
coolant, brake fluid, and washer fluid,
always be sure to clean the area
around any filler plug, drain plug, or
dipstick before checking or draining
any lubricant or fluid. This is espe-
cially important in dusty or sandy
areas and when the vehicle is used
on unpaved roads. Cleaning the plug
and dipstick areas will prevent dirt
and grit from entering the engine and
other mechanisms that could be
damaged.

CHECKING FLUID LEVELS

Maintenance

ENGINE OIL

Checking the engine oil level

1. Be sure the vehicle is on level

ground.

2. Start the engine and allow it to

reach normal operating tempera-
ture.

3. Turn the engine off and wait for a

few minutes (about 5 minutes) for
the oil to return to the oil pan.

4. Pull the dipstick out, wipe it clean,

and reinsert it fully.

5. Pull the dipstick out again and

check the level. The level should
be between F and L.

If it is near or at L, add enough oil to
bring the level to F. Do not overfill.

Use a funnel to help prevent oil
from being spilled on engine com-
ponents.

Use only the specified engine oil.
(Refer to “Recommended lubricants
and capacities” in chapter 9.)

CAUTION -

Replacing
engine oil

Do not overfill the engine oil. It
may damage the engine.

WARNING

- Radiator hose

Be very careful not to touch the
radiator hose when checking or
adding the engine oil as it may
be hot enough to burn you.

OJFH075163

■

Gasoline Engine (Nu 2.0L - GDI)

OJFH075164

■

Gasoline Engine (Nu 2.0L - GDI)

8 25

Maintenance

Changing the engine oil and
filter

Have engine oil and filter changed by
an authorized Kia dealer according
to the Maintenance Schedule at the
beginning of this chapter.

CALIFORNIA PROPO-

SITION 65 WARNING

Engine oil contains chemicals
known to the State of California
to cause cancer, birth defects
and reproductive harm. Used
engine oil may cause irritation or
cancer of the skin if left in con-
tact with the skin for prolonged
periods of time. Always protect
your skin by washing your
hands thoroughly with soap and
warm water as soon as possible
after handling used oil.

Maintenance

ENGINE MAINTENANCE MODE(FOR PLUG-IN HYBRID)

Starting Engine Maintenance
Mode

To prevent damage of the engine
lubrication system when the engine
has not been started for a long time.
- When the engine is started Ignition

is ON after 5 weeks of being turned
off, the engine maintenance mode
will operate.

When the engine maintenance

mode is operated, HEV mode will
be kept on after the engine is ON
and the above message will be dis-
played on the cluster.

If you press the HEV switch to shift
EV mode during engine mainte-
nance mode, the above message will
appear due to priority of the engine
maintenance mode.

Stopping Engine Maintenance
Mode

The engine will automatically stop
after sufficient heating. (If the engine
is turned OFF without sufficient heat-
ing, the engine maintenance mode
will be operated once more.

OJFHP076230N

OJFHP076229N

8 27

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 it

cools 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 the
radiator cap while the engine is
operating or hot. Doing so
might lead to cooling system
and engine damage.

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KIA Optima Hybrid (2018 year). Manual — part 27

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