2023 TOYOTA HILUX radiator

4827-3. Do-it-yourself maintenance
HILUX_OM_OM0K789E_(EE)
Do-it-yourself ser vice precautions
If you perform maintenance by yourself, be sure to follow the
correct procedure as given in these sections.
ItemsParts and tools
Battery condition
( P. 494)
•Warm water• Baking soda•Grease
• Conventional wrench (for terminal clamp bolts)
• Distilled water
Engine coolant/
intercooler
coolant
(if equipped) level
( P. 492)
• “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 hybrid organic acid technology
“Toyota Super Long Life Coolant” is pre-mixed with
50% coolant and 50% deionized water.
• Funnel (used only for adding coolant)
Engine oil level
( P. 489)
• “Toyota Genuine Motor Oil” or equivalent
• Rag or paper towel
• Funnel (used only for adding engine oil)
Fuses (P. 5 2 0 )• Fuse with same amperage rating as original
Light bulbs
( P. 525)
• Bulb with same number and wattage rating as origi-
nal
• Phillips-head screwdriver
• Flathead screwdriver•Wrench
Radiator,
condenser and
intercooler
(if equipped)
( P. 493)

Tire inflation
pressure
( P. 510)
• Tire pressure gauge• Compressed air source
Washer fluid
( P. 498)
• Water or washer fluid containing antifreeze (for win-
ter use)
• Funnel (used only for adding water or washer fluid)

4837-3. Do-it-yourself maintenance
HILUX_OM_OM0K789E_(EE)
7
Maintenance and care
WARNING
The engine compartment contains many mechanisms and fluids that may
move suddenly, become hot, or become el ectrically energized. To avoid death
or serious injury, observe the following precautions.
■ When working on the engine compartment
● Keep hands, clothing and tools away from the moving fan and engine
drive belt.
● Be careful not to touch the engine, radiator, exhaust manifold, etc. right
after driving as they may be hot. Oil and other fluids may also be hot.
● Do not leave anything that may burn easily, such as paper and rags, in the
engine compartment.
● Do not smoke, cause sparks or expose an open flame to fuel or the bat-
tery. Fuel and battery fumes are flammable.
● Be extremely cautious when working on the battery. It contains poisonous
and corrosive sulfuric acid.
● Take care because brake fluid can harm your hands or eyes and damage
painted surfaces. If fluid gets on your hands or in your eyes, flush the
affected area with clean water immediately.
If you still experience discomfort, consult a doctor.
■ Safety glasses
Wear safety glasses to prevent flying or falling material, fluid spray, etc.
from getting in your eyes.
NOTICE
■ If you remove the air cleaner filter
Driving with the air cleaner filter removed may cause excessive engine wear
due to dirt in the air.
■ If the fluid level is low or high
It is normal for the brake fluid level to go down slightly as the brake pads
wear or when the fluid level in the accumulator is high.
If the reservoir needs frequent refilling, it may indicate a serious problem.

4867-3. Do-it-yourself maintenance
HILUX_OM_OM0K789E_(EE)
Engine compar tment
Gasoline engine
Engine coolant reservoir
( P. 492)
Engine oil level dipstick
( P. 489)
Engine oil filler cap ( P. 490)
Fuse box ( P. 520)
Battery ( P. 494)
Washer fluid tank ( P. 498)
Condenser ( P. 493)
Radiator ( P. 493)
1
2
3
4
5
6
7
8

4877-3. Do-it-yourself maintenance
HILUX_OM_OM0K789E_(EE)
7
Maintenance and care
Diesel engine (vehicles without water-cooled intercooler)
Engine coolant reservoir
( P. 492)
Engine oil filler cap ( P. 490)
Engine oil level dipstick
( P. 489)
Fuel filter ( P. 499, 614)
Fuse box ( P. 520)
Battery ( P. 494)
Washer fluid tank ( P. 498)
Intercooler ( P. 493)
Condenser (if equipped)
( P. 493)
Radiator ( P. 493)
1
2
3
4
5
6
7
8
9
10

4887-3. Do-it-yourself maintenance
HILUX_OM_OM0K789E_(EE)
Diesel engine (vehicles with water-cooled intercooler)
Engine coolant reservoir
( P. 492)
Engine oil filler cap ( P. 490)
Engine oil level dipstick
( P. 489)
AdBlue™ tank cap ( P. 500)
Fuel filter ( P. 499, 614)
Fuse box ( P. 520)
Battery ( P. 494)
Washer fluid tank ( P. 498)
Intercooler coolant reservoir
( P. 492)
Intercooler cooling radiator
( P. 493)
Condenser (if equipped)
( P. 493)
Radiator ( P. 493)
1
2
3
4
5
6
7
8
9
10
11
12

4937-3. Do-it-yourself maintenance
HILUX_OM_OM0K789E_(EE)
7
Maintenance and care
■If the coolant level drops within a short time of replenishing
Visually check the radiator, hoses, engine coolant reservoir cap, intercooler
coolant reservoir cap (if equipped), drain cock and water pump. If you cannot
find a leak, have any authorized Toyota retailer or Toyota authorized repairer,
or any reliable repairer test the cap and check for leaks in the cooling system.
Check the radiator, condenser and intercooler coolant radiator/inter-
cooler and clear away any foreign objects. If any of the above parts is
extremely dirty or you are not sure of their condition, have your vehi-
cle inspected by any authorized Toyota retailer or Toyota authorized
repairer, or any reliable repairer.
WARNING
■ When the engine is hot
Do not remove the radiator cap (if equipped), the engine coolant reservoir
cap or intercooler coolant reservoir cap (if equipped).
The cooling system may be under pressure and may spray hot coolant if the
cap is removed, causing serious injuries, such as burns.
NOTICE
■ When adding coolant
Coolant is neither plain water nor straight antifreeze. The correct mixture of
water and antifreeze must be used to provide proper lubrication, corrosion
protection and cooling. Be sure to read the antifreeze or coolant label.
■ If you spill coolant
Be sure to wash it off with water to prevent it from damaging parts or paint.
■ Notice on coolant quality
Do not use improper coolant. If improper coolant is used, the engine cooling
system may be damaged.
Radiator, condenser and intercooler coolant radiator/intercooler
(if equipped)
WARNING
■ When the engine is hot
Do not touch the radiator, condenser or intercooler coolant radiator/inter-
cooler as they may be hot and cause serious injuries, such as burns.

6108-2. Steps to take in an emergency
HILUX_OM_OM0K789E_(EE)
If your vehicle overheats
Stop the vehicle in a safe place and turn off the air conditioning sys-
tem, 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 fan
If a large amount of coolant
leaks, immediately contact any
authorized Toyota retailer or
Toyota authorized repairer, or
any reliable repairer.
The following may indicate that your vehicle is overheating.
● The needle of the engine coolant temperature gauge (P. 128)
enters the red zone or a loss of engine power is experienced.
(For example, the vehicle speed does not increase.)
● Vehicles with multi-information display: “Engine Coolant Temp
High Stop in a Safe Place See Owner’s Manual” is shown on the
multi-information display.
● Steam comes out from under the hood.
Correction procedures
1
2
3
1
2

6118-2. Steps to take in an emergency
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8
When trouble arises
The coolant level is satisfactory if it is between the “F” and “L” lines
on the reservoir.
4
Reservoir
“F” line
“L” line
Radiator cap (if equipped)
1
2
3
4
Engine coolant (gasoline
engine)
Engine coolant (diesel engine)
Intercooler coolant (if equipped)