2018 VOLVO XC90 TWIN ENGINE coolant

MAINTENANCE AND SERVICE
609
Engine compartment overview
This overview shows some service-related com-
ponents. Some of the components included in the vehi-
cle's electric drive system are located in the
engine compartment. Exercise caution when
accessing the engine compartment and only
touch what is required for normal maintenance.
WARNING Orange wiring may only be handled by quali-
fied personnel.
WARNING
Several components in the vehicle work with
high voltage that can be hazardous in case of
an incorrect procedure.
• Do not touch anything that is not clearly
described in this Owner's Manual.
• Be careful when checking/filling fluids in
the engine compartment. The layout of the engine compartment may vary depend-
ing on model and engine variant.
Coolant expansion tank
Brake fluid reservoir (located on the driver's
side)
Washer fluid filler pipe
11 Fusebox
Air filter
Engine oil filler pipe
WARNING Bear in mind that the cooling fan (located at
the front of the engine compartment behind
the radiator) may start or continue running
automatically up to about 6 minutes after the
engine is turned off.
Always entrust engine washing to a workshop
– an authorized Volvo workshop is recom-
mended. If the engine is hot, there is a risk of
fire.
WARNING
The ignition system works with extremely high
and dangerous voltages. The vehicle electrical
system should always be in ignition mode 0
when work in being performed in the engine
compartment.
Do not touch any spark plugs or ignition coils
when the vehicle electrical system is in igni-
tion mode II or when the engine is warm.
Related information
•
Opening and closing the hood (p. 607)
• Filling washer fluid (p. 650)
• Refilling coolant (p. 612)
• Fuses in the engine compartment (p. 622)
• Checking and filling engine oil (p. 611)
• Ignition modes (p. 427) 11
Fill the washer fluid at regular intervals, e.g. when refueling.

||MAINTENANCE AND SERVICE
612
NOTE
If the conditions for measuring oil level are
not properly fulfilled (time after engine shut-
down, vehicle inclination, ambient tempera-
ture, etc.) the message
No value available
will be shown in the center display. This does
not mean that anything is wrong in the vehi-
cle systems.
Related information
• Engine oil (p. 610)
• Engine oil specifications (p. 662)
• Ignition modes (p. 427)
• Vehicle status (p. 602) Refilling coolant
Coolant helps keep the combustion engine at
the right operating temperature. The heat trans-
ferred from the engine to the coolant can be
used to warm the passenger compartment.
When refilling coolant, follow the instructions on
the package. Never fill the cooling system with
only water. The risk of freezing is increased with
too low or too high amounts of coolant.
If there is coolant under the vehicle, smoke from
the cooling system, or if more than 2 liters (about
2 quarts) of coolant has been added to the sys-
tem, there could be something wrong with the
cooling system and starting the vehicle could
damage the engine. Call a tow truck and do not
attempt to start the engine.
WARNING The coolant may be very hot. Never unscrew
the cap when the coolant is hot. If coolant
must be filled, unscrew the expansion tank
cap slowly to relieve overpressure. Coolant expansion tank.

MAINTENANCE AND SERVICE
}}
* Option/accessory. 613Lift the rubber strip by pressing it inward into
the engine compartment.
Remove the plastic cover by folding out the
catch and lifting the cover upward.
Unscrew the expansion tank cap and fill
coolant as needed. The level should be
between the MIN and MAX marks on the
expansion tank.
CAUTION •
Mix the coolant with water of acceptable
quality. If you are unsure of the quality of
the water, use a Volvo-recommended
premixed coolant.
• Make sure the coolant mixture is 50%
water and 50% coolant.
• Only use coolants with corrosion protec-
tion recommended by Volvo.
• To help ensure sufficient corrosion pro-
tection in the system, only use new cool-
ant when replacing larger components in
the cooling system.
• Never run the engine unless the cooling
system is properly filled. An improperly
filled cooling system could lead to high
temperatures and cracks in the cylinder
heads.
• High levels of chlorine, chlorides and
other salts may cause corrosion in the
cooling system.
Related information
•Engine compartment overview (p. 609)
• Coolant specifications (p. 663) Replacing bulbs
Halogen headlights are not available on all mod-
els and markets. Contact a Volvo retailer for
more information.
LED 13
bulbs must be replaced by a workshop.
An authorized Volvo workshop is recommended.
NOTE For information on lights not mentioned in
this article, contact a Volvo dealer or a certi-
fied Volvo service technician.
NOTE
Exterior lighting such as headlights and tail-
lights may develop temporary condensation
on the inside of the lens. This is normal. All
exterior lighting is designed to resist this.
Condensation is normally vented out of the
lamp housing once the light has been lit for
some period of time.
NOTE
Bulbs for active curve lighting* contain traces
of mercury and should therefore always be
submitted to a certified Volvo service techni-
cian. 13
LED (Ligth Emitting Diode)

MAINTENANCE AND SERVICE
619
Hybrid battery
The vehicle's electric motor is powered by a
rechargeable, maintenance-free, lithium-ion
hybrid battery.
NOTE The vehicle cannot be started if the hybrid
battery is discharged.
NOTE
If both the starter battery and the hybrid bat-
tery are discharged, both batteries must be
charged. In such cases, it is not possible to
charge only the hybrid battery first.
The starter battery must have a certain level
of charge for it to be possible to charge the
hybrid battery.
WARNING
Hybrid battery replacement may only be per-
formed by a workshop – an authorized Volvo
workshop is recommended.
CoolantThe hybrid battery's cooling system has its own
expansion tank.
CAUTION Filling the hybrid battery coolant should only
be performed by a workshop – an authorized
Volvo workshop is recommended.
SpecificationsType: Lithium-ion
Power reserve: 10.4 kWh.
NOTE
The capacity of the hybrid battery decreases
with age and use, which could result in
increased use of the combustion engine,
leading to higher fuel consumption and
reduced electric motor range.
Related information
•
Battery symbols (p. 620)
• Start battery (p. 615)
• Charging the hybrid battery (p. 407)

MAINTENANCE AND SERVICE
}}
623
Fuse pliers are provided on the inside of the fuse
box cover to assist in removing and inserting
fuses.
There are also spaces for several extra fuses in
the fusebox.
PositionsThere is a decal with a diagram of the locations
of the fuses on the inside of the cover.
• Fuses 1–13, 18–30, 35–37 and 46–70 are
"Micro" fuses.
• Fuses 14–17, 31–34, 38–45 and 71–78 are
"MCase" fuses and should only be replaced
by a workshop 17
. Function
AA –
––
––
–Control module for actuator for
engaging/changing gears, auto-
matic transmission
5High-voltage coolant heater
control module
5 Function
AA Control module for A/C; heat
exchanger cut-off valve; cut-off
valve for coolant through the cli-
mate system
5 Hybrid battery control module;
high-voltage converter for com-
bined high-voltage generator/
starter motor with 500 V–12 V
voltage converter
5 –
– Converter for controlling feed to
rear axle electric motor
10 Hybrid battery control module;
high-voltage converter for com-
bined high-voltage generator/
starter motor with 500 V–12 V
voltage converter
10 Charge module
5 Cut-off valve for hybrid battery
coolant; coolant pump 1 for
hybrid battery
10 Coolant pump for electric drive
system
10 Function
AA Hybrid component cooling fan 25
–
– –
– –
– –
– –
– –
– –
– –
– –
– 12 V outlet in tunnel console,
front
15 12 V outlet in tunnel console
between second-row seats
B
12 V outlet in tunnel console,
between rear seats C
; USB ports
in tunnel console between rear
seats C 15
17
An authorized Volvo workshop is recommended.

||MAINTENANCE AND SERVICE
* Option/accessory.
628 Function
AA Door module in right-side rear door 20
Fuses in the trunk/cargo compart-
ment
10Control module for Internet-con-
nected vehicle; Control module for
Volvo On Call
5Door module in left-side rear door 20
Audio control module (amplifier)
(certain models only)
40Climate system blower module
(rear)*
40Multi-band antenna module 5
Front seat massage function*
5–
–Rear window wiper
15Fuel pump control module
15Relay windings for distribution box
in engine compartment; Relay
windings for transmission oil pump
5–
– Function
AA Driver's seat heating
15 Front passenger's seat heating 15
Coolant pump
10 –
– Door module in left-side front door 20
Active chassis control module*
20 –
– Sensus control module
10 –
– –
– Door module in right-side front
door
20 Display for rear seat convenience
functions
C
; On-board diagnostics
(OBD II) in tunnel console between
rear seats C
; Extra movement sen-
sor C 5
C Function
AA TV* (certain markets only)
5 Primary fuse for fuses 53 and 58 15
A
Ampere
B Not Excellence
C Excellence
Related information
• Fuses and fuseboxes (p. 620)
• Replacing fuses (p. 621)

SPECIFICATIONS
661
Engine specifications
Engine specifications (output, etc.) for each
engine variant are shown in the table below. The
specifications for Special Edition vehicles may
vary. Twin Engine vehicles are powered by both a
gasoline engine and an electric motor (ERAD –
Electric Rear Axle Drive).
NOTE Not all engines are available on all markets.
Engine
Engine codeA
Output
(kW/rps) Output
(hp/rpm) Torque
(Nm/rps) Torque
(ft. lbs./rpm) Number of cylinders
T8 Twin Engine

B4204T28 233/100 313/6000 400/37–90 295/2200–5400 4A
The engine code, component and manufacturer serial numbers can be found \
on the engine.
Electric motorMax. output: 65 kW (87 hp).
Torque: 240 Nm.
Related information
• Type designations (p. 654)
• Engine oil specifications (p. 662)
• Coolant specifications (p. 663)

SPECIFICATIONS
663
Coolant specifications
Recommended grade: Volvo-recommended
coolant diluted with 50% water. See package.
Consult a Volvo retailer if you have any ques-
tions.
Do not mix different types of antifreeze as this
could pose a health risk.
Related information
• Refilling coolant (p. 612) Transmission fluid specifications
Under normal driving conditions, the transmis-
sion fluid will not need to be changed during its
service life. However, it may need to be changed
if the vehicle is driven frequently in adverse driv-
ing conditions.
Automatic transmission Prescribed transmission fluid:
AW1 Brake fluid specifications
The medium in the hydraulic brake system is
called brake fluid and is used to transfer braking
force from e.g. pressure on the brake pedal via a
master brake cylinder to one or more slave cylin-
ders, which in turn act on a mechanical brake.
Recommended grade: Volvo Original Dot 4
class 6 or equivalent.
NOTE
Changing or filling brake fluid should be
entrusted to an authorized Volvo workshop.
Related information
•
Engine compartment overview (p. 609)