2019 VOLVO S90 TWIN ENGINE cooling

STARTING AND DRIVING
465
Overheating of engine andtransmission
In demanding driving conditions, such as drivingin mountainous areas or hot weather, there is arisk of the engine or transmission overheating,especially when carrying heavy loads.
Engine power may be temporarily limited.
Remove any auxiliary lights mounted in frontof the grille when driving in hot weather.
If the temperature in the engine's coolingsystem becomes too high, a warning symbolwill appear in the instrument panel along withthe message Engine temperature Hightemperature Stop safely. Pull over to asafe location and let the engine idle for a fewminutes to cool down.
If the message Engine temperature Hightemperature Turn off engine or Enginecoolant Level low, turn off engine is dis-played, stop the vehicle and turn off theengine.
If the transmission begins to overheat, analternative gear shifting program will beselected. An integrated protective functionwill also be activated, the warning symbol willilluminate and the message Transmissionwarm Reduce speed to lowertemperature or Transmission hot Stopsafely, wait for cooling will be displayed inthe instrument panel. Follow the recommen-dations given by reducing speed or stopping
the vehicle safely and letting the engine idlefor a few minutes to let the transmissioncool.
If the vehicle begins to overheat, the air con-ditioning may be temporarily switched off.
After a prolonged period of driving indemanding conditions, do not turn off theengine immediately after stopping.

NOTE
It is normal for the engine's cooling fan tooperate for a short time after the engine isswitched off.

Symbols in the instrument panel
Symbol Meaning
High engine temperature. Followthe recommendations provided.
Low coolant level. Follow the rec-ommendations provided.
Transmission hot/overheated/cool-ing. Follow the recommendationsprovided.
Related information
Refilling coolant (p. 599)
Preparing for a long trip (p. 457)

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LOADING, STORAGE AND PASSENGER COMPARTMENT
* Option/accessory.578
The illustration is generic – the design may vary.
To lock the glove compartment:
Insert the key into the lock on the glove com-partment.
Turn the key 90 degrees clockwise.
Remove the key from the lock.
–To unlock, perform the above steps inreverse.

Using the glove box as a cooled area
The glove compartment can be used to cool e.g.drinks or food. Cooling is possible when the cli-mate system is active (i.e. when the ignition is inmode II or when the engine is running).
The illustration is generic – the design may vary.
Activate cooling
Deactivate cooling
–Activate or deactivate cooling by moving thecontrol as far as possible toward the passen-ger compartment/glove compartment.
Related information
Passenger compartment interior (p. 574)
Private Locking (p. 264)
Sun visors
In the ceiling in front of the driver and front pas-senger, there are sun visors that can be loweredand angled to the side as necessary.
The illustration is generic – the design may vary.
The mirror lighting* comes on automatically whenthe cover is lifted up.
The mirror frame has a holder for e.g. cards ortickets.

Related information
Passenger compartment interior (p. 574)

MAINTENANCE AND SERVICE
596
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 withhigh voltage that can be hazardous in case ofan incorrect procedure.
Do not touch anything that is not clearlydescribed 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'sside)
Washer fluid filler pipe12
Fusebox
Air filter
Engine oil filler pipe
WARNING
Bear in mind that the cooling fan (located atthe 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 highand dangerous voltages. The vehicle electricalsystem should always be in ignition mode 0when work in being performed in the enginecompartment.
Do not touch any spark plugs or ignition coilswhen the vehicle electrical system is in igni-tion mode II or when the engine is warm.

Related information
Opening and closing the hood (p. 594)
Filling washer fluid (p. 635)
Refilling coolant (p. 599)
Fuses in the engine compartment (p. 608)
Checking and filling engine oil (p. 598)
Ignition modes (p. 429)
12Fill the washer fluid at regular intervals, e.g. when refueling.

MAINTENANCE AND SERVICE
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599

NOTE
If the conditions for measuring oil level arenot 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 doesnot mean that anything is wrong in the vehi-cle systems.

Related information
Engine oil (p. 597)
Engine oil specifications (p. 646)
Ignition modes (p. 429)
Vehicle status (p. 588)
Refilling coolant
Coolant helps keep the combustion engine atthe 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 onthe 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 fromthe 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 unscrewthe cap when the coolant is hot. If coolantmust be filled, unscrew the expansion tankcap slowly to relieve overpressure.
Coolant expansion tank, left-hand drive vehicle.

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MAINTENANCE AND SERVICE
* Option/accessory.600
Unscrew the cover in the plastic covering.
Unscrew the expansion tank cap and fillcoolant as needed. The level should notexceed the yellow MAX mark inside theexpansion tank.
Put the components back in place in the reverseorder.

CAUTION
Do not ingest the contents. May causedamage to organs (kidneys).
Use premixed coolant according to Vol-vo's recommendations. If concentratedcoolant is used, make sure that the cool-ant mixture is 50% coolant and 50%water of acceptable quality.
Do not mix different types of coolant.
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. 596)
Coolant specifications (p. 647)
Replacing bulbs
Halogen headlights are not available on all mod-els and markets. Contact a Volvo retailer formore information.
LED14 bulbs must be replaced by a workshop.An authorized Volvo workshop is recommended.

NOTE
For information on lights not mentioned inthis 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 tracesof mercury and should therefore always besubmitted to a certified Volvo service techni-cian.

MAINTENANCE AND SERVICE
605
Hybrid battery
The vehicle's electric motor is powered by arechargeable, maintenance-free, lithium-ionhybrid battery.

NOTE
The vehicle cannot be started if the hybridbattery is discharged.

NOTE
If both the starter battery and the hybrid bat-tery are discharged, both batteries must becharged. In such cases, it is not possible tocharge only the hybrid battery first.
The starter battery must have a certain levelof 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.

Coolant
The hybrid battery's cooling system has its ownexpansion tank.
CAUTION
Filling the hybrid battery coolant should onlybe performed by a workshop – an authorizedVolvo workshop is recommended.

Specifications for hybrid battery
Type: Lithium-ion
Power reserve: 10.4 kWh.

NOTE
The capacity of the hybrid battery decreaseswith 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. 606)
Start battery (p. 601)
Charging the hybrid battery (p. 409)

MAINTENANCE AND SERVICE
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* Option/accessory.609
Fuse pliers are provided on the inside of the fusebox cover to assist in removing and insertingfuses.
There are also spaces for several extra fuses inthe fusebox.

Positions
There 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 workshop16.
FunctionAmpere
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Control module for actuatorfor engaging/changing gears,automatic transmission
5
High-voltage coolant heatercontrol module5
FunctionAmpere
Control module for A/C; heatexchanger cut-off valve; cut-off valve for coolant throughthe climate system
5
Hybrid battery control module;high-voltage converter forcombined high-voltage gener-ator/starter motor with 500V–12 V voltage converter
5
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Converter for controlling feedto rear axle electric motor10
Hybrid battery control module;high-voltage converter forcombined high-voltage gener-ator/starter motor with 500V–12 V voltage converter
10
Charge module5
Cut-off valve for hybrid batterycoolant; coolant pump 1 forhybrid battery
10
Coolant pump for electric drivesystem10
FunctionAmpere
Hybrid component cooling fan 25
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Front USB port in tunnel con-sole, front*5
12 V outlet in tunnel console,front15
12 V outlet in tunnel console
between second-row seatsA
12 V outlet in tunnel console,
between rear seatsB; USBports in tunnel console
between rear seatsB
15
16An authorized Volvo workshop is recommended.

SPECIFICATIONS
647
Coolant specifications
Recommended grade: Volvo-approved pre-mixed coolant. If concentrated coolant is used,mix with 50% water. Consult a Volvo retailer ifyou have any questions.
To avoid deterioration of the cooling system,engine trouble, etc., only approved Volvo coolantshould be used.

WARNING
Do not ingest. May cause damage to organs(kidneys). The product contains ethylene gly-col, inhibitor, emetic, water, etc.

Related information
Refilling coolant (p. 599)
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

Related information
Type designations (p. 638)
Brake fluid specifications
The medium in the hydraulic brake system iscalled 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 or similarfluid that meets a combination of Dot 4, 5.1 andISO 4925 class 6.

NOTE
Changing or filling brake fluid should beentrusted to an authorized Volvo workshop.

Related information
Engine compartment overview (p. 596)