2018 VOLVO XC90 T8 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 theengine compartment. Exercise caution whenaccessing the engine compartment and onlytouch 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 ofan incorrect procedure.
• Do not touch anything that is not clearly described in this Owner's Manual.
• Be careful when checking/filling fluids inthe 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 behindthe radiator) may start or continue runningautomatically up to about 6 minutes after theengine 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 offire.
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.

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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 availablewill 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 beused to warm the passenger compartment.
When refilling coolant, follow the instructions on the package. Never fill the cooling system withonly water. The risk of freezing is increased withtoo 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 (about2 quarts) of coolant has been added to the sys-tem, there could be something wrong with thecooling system and starting the vehicle coulddamage the engine. Call a tow truck and do notattempt to start the engine.
WARNING
The coolant may be very hot. Never unscrew the cap when the coolant is hot. If coolantmust be filled, unscrew the expansion tankcap slowly to relieve overpressure.
Coolant expansion tank.

MAINTENANCE AND SERVICE
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* Option/accessory.613
Lift 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 ofthe water, use a Volvo-recommendedpremixed 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 inthe cooling system.
• Never run the engine unless the coolingsystem is properly filled. An improperlyfilled cooling system could lead to hightemperatures and cracks in the cylinderheads.
• High levels of chlorine, chlorides andother salts may cause corrosion in thecooling 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 formore 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 condensationon the inside of the lens. This is normal. Allexterior lighting is designed to resist this.Condensation is normally vented out of thelamp housing once the light has been lit forsome 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-ionhybrid 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 thehybrid battery.
WARNING
Hybrid battery replacement may only be per- formed by a workshop – an authorized Volvoworkshop 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 authorizedVolvo 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 inincreased use of the combustion engine,leading to higher fuel consumption andreduced electric motor range.
Related information
•Battery symbols (p. 620)
• Start battery (p. 615)
• Charging the hybrid battery (p. 407)

MAINTENANCE AND SERVICE
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623
Fuse pliers are provided on the inside of the fuse box cover to assist in removing and insertingfuses. There are also spaces for several extra fuses in the fusebox.
PositionsThere is a decal with a diagram of the locationsof 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
.
FunctionAA
– –
– –
– –
Control module for actuator for engaging/changing gears, auto-matic transmission 5
High-voltage coolant heater control module
5
FunctionAA
Control module for A/C; heat exchanger cut-off valve; cut-offvalve for coolant through the cli-mate system5
Hybrid battery control module; high-voltage converter for com-bined high-voltage generator/starter motor with 500 V–12 Vvoltage converter5
– –
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 Vvoltage converter10
Charge module 5
Cut-off valve for hybrid battery coolant; coolant pump 1 forhybrid battery
10
Coolant pump for electric drive system
10
FunctionAA
Hybrid component cooling fan 25
– –
– –
– –
– –
– –
– –
– –
– –
– –
12 V outlet in tunnel console, front15
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 rearseats C 15
17
An authorized Volvo workshop is recommended.

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MAINTENANCE AND SERVICE
* Option/accessory.
628
FunctionAA
Door module in right-side rear door 20
Fuses in the trunk/cargo compart- ment 10
Control module for Internet-con- nected vehicle; Control module forVolvo On Call 5
Door module in left-side rear door 20
Audio control module (amplifier) (certain models only)
40
Climate system blower module (rear)
* 40
Multi-band antenna module 5
Front seat massage function
*5
– –
Rear window wiper 15
Fuel pump control module 15
Relay windings for distribution box in engine compartment; Relaywindings for transmission oil pump 5
– –
FunctionAA
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 betweenrear seats C
; Extra movement sen-
sor C 5
C
FunctionAA
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 specificationsEngine specifications (output, etc.) for each engine variant are shown in the table below. Thespecifications for Special Edition vehicles mayvary. Twin Engine vehicles are powered by both agasoline engine and an electric motor (ERAD –Electric Rear Axle Drive).NOTE
Not all engines are available on all markets.
EngineEngine codeAOutput
(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 4
A 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 itsservice life. However, it may need to be changedif 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 brakingforce from e.g. pressure on the brake pedal via amaster 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)