
STARTING AND DRIVING
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357
Driving through standing water
The vehicle should be driven with extreme cau- tion if it is necessary to drive through standingwater.
The vehicle can be driven through water up to a depth approximately level with the floor at walk-ing speed to help prevent water from enteringthe differential and/or the transmission or dam-aging electrical components. • If possible, check the depth of the water before driving through it. Take particular carewhen driving through flowing water.
• Before driving through water, always select the
Off Road drive mode to ensure that the
gasoline engine is running and to maximize ground clearance.
• After driving through water, apply the brakesand check that they are functioning correctly.
• Clean the electrical connections for trailerwiring after driving in mud or water.
• When driving through water, maintain lowspeed and do not stop in the water.
CAUTION
• Damage may occur to the engine, trans- mission, electrical components, etc. if thevehicle is driven through water higherthan its floor level. Be aware that wavescreated by other vehicles could cause thelevel to temporarily be above the vehicle'sfloor level.
• Damage to any components due to waterabove the floor level, vapor lock or insuffi-cient oil is not covered under warranty.
• If the engine has been stopped while thevehicle is in water, do not attempt torestart it. Have the vehicle towed out ofthe water and inspected by a trained andqualified Volvo service technician.
WARNING
• Avoid driving through standing or rushing water. Doing so can be dangerous and itmay also be difficult to determine theactual depth of the water.
• If water cannot be avoided, after drivingthrough the water, press lightly on thebrake pedal to ensure that the brakes arefunctioning normally. Water or mud canmake the brake linings slippery, resultingin delayed braking effect.
Related information
•
Towing recommendations (p. 360)
Overheating the engine and transmission
In demanding driving conditions, such as when transporting heavy loads, driving in mountainousareas or in very hot weather there is a risk ofoverheating the engine or transmission.
• The engine's output may be slightly limited if there is a risk of overheating.
• Remove e.g., auxiliary lights mounted in frontof the grille in hot weather.
• If the temperature of the engine coolantbecomes too high, the warning symbol will illuminate and the message
Engine
temperature/Stop safely will be displayed.
Stop the vehicle as soon as possible in a safe place and let the engine idle for severalminutes.
• If the message
Engine temperature/High
temperature Turn off engine or Engine
coolant/Stop safely is displayed, stop
safely and turn off the engine.
• If the transmission begins to overheat, an alternative gear shifting program will beselected. An integrated protective functionwill also by activated, the warning symbol will illuminate and the message
Transmission
warmHigh temperature Reduce speed
or Transmission warmStop safely, wait
for cooling will be displayed in the instru-
ment panel.

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STARTING AND DRIVING
358•
The air conditioning may be switched off temporarily.
• After a prolonged period of driving, do notturn off the engine immediately after stop-ping.
• The engine cooling fan commonly continuesto run for several minutes after the enginehas been turned off.
WARNING
The cooling fan (located at the front of the engine compartment, behind the radiator) maystart or continue to operate (for up to6 minutes) after the engine has beenswitched off.
Related information
•
Driving with a trailer (p. 367)
• Before a long distance trip (p. 355)
Winter driving
Check your vehicle before the approach of cold weather.
The following advice is worth noting:
• Make sure that the engine coolant contains 50 percent antifreeze. Any other mixture willreduce freeze protection. This gives protec-tion against freezing down to –31 °F(–35 °C). The use of "recycled" antifreeze isnot approved by Volvo. Different types ofantifreeze must not be mixed.
• Volvo recommends using only genuine Volvoantifreeze in your vehicle's radiator.
• Try to keep the fuel tank well filled – thishelps prevent the formation of condensationin the tank. In addition, in extremely coldweather conditions it is worthwhile to addfuel line de-icer before refueling.
• The viscosity of the engine oil is important.Oil with low viscosity (thinner oil) improvescold-weather starting as well as decreasingfuel consumption while the engine is warm-ing up. Full synthetic 0W-30 oil is recom-mended for driving in areas with sustainedlow temperatures.
• The load placed on the battery is greater dur-ing the winter since the windshield wipers,lighting, etc., are used more often. Moreover,the capacity of the battery decreases as thetemperature drops. In very cold weather, apoorly charged battery can freeze and bedamaged. It is therefore advisable to check the state of charge more frequently andspray an anti-rust oil on the battery posts.
• Volvo recommends the use of snow tires onall four wheels for winter driving.
• To prevent the washer fluid reservoir fromfreezing, add washer solvents containingantifreeze. This is important since dirt is oftensplashed on the windshield during winterdriving, requiring the frequent use of thewashers and wipers. Volvo Washer Solventshould be diluted as follows: Down to 14 °F(–10 °C): 1 part washer solvent and 4 partswater Down to 5 °F (–15 °C): 1 part washersolvent and 3 parts water Down to 0 °F(–18 °C): 1 part washer solvent and 2 partswater Down to –18 °F (–28 °C): 1 partwasher solvent and 1 part water.
• Use Volvo Teflon Lock Spray in the locks.
• Avoid using de-icing sprays as they cancause damage to the locks.
Related information
• Snow tires and chains (p. 451)

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STARTING AND DRIVING
374
CAUTION
•When starting in cold weather, the auto- matic transmission may shift up at slightlyhigher engine speeds than normal untilthe automatic transmission fluid reachesnormal operating temperature.
• Do not race a cold engine immediatelyafter starting. Oil flow may not reachsome lubrication points fast enough toprevent engine damage.
• The engine should be idling when youmove the gear selector. Never accelerateuntil after you feel the transmissionengage. Accelerating immediately afterselecting a gear will cause harsh engage-ment and premature transmission wear.
• Selecting
P or N when idling at a stand-
still for prolonged periods of time will helpprevent overheating of the automatictransmission fluid.
Related information
• Ignition modes (p. 370)
• Turning the engine off (p. 374)
• Changing the remote key's battery (p. 232)
• Jump starting (p. 365)
Turning the engine off
The engine can be turned off using the start knob on the tunnel console.
Start knob in the tunnel console between the front seats
To turn off the engine:
–Turn the start knob toward STOP and
release it to switch the engine off.
If the gear selector is in P or if the vehicle is mov-
ing:
–Hold the knob in the STOP position until the
engine stops.
Related information
• Starting the engine (p. 372)
• Ignition modes (p. 370)
Driving systems
The XC90 T8 Twin Engine Plug-in Hybrid is a parallel hybrid, which means that it has two sep-arate drive systems: an electric motor and a gas-oline engine. Depending on the drive modeselected and the amount of electric power avail-able in the hybrid battery, the two systems canbe used in tandem or separately.
Two drive systemsA control system coordinates both of the drive systems to help optimize driving economy.
Hybrid battery
Gasoline engine
High voltage generator 3
Electric motor
3
Combined generator and starter motor (Crank Integrated Starter Generator).

WHEELS AND TIRES
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445
to reduce the chance of oversteer during hard braking.
• Hitting curbs or potholes can damage thetires and/or wheels permanently.
Tire rotationYour vehicle has no required tire rotation. Tire wear is affected by a number of factors such astire inflation, ambient temperature, driving style,etc.
NOTE
• If the tires are rotated, they should only be moved from front to rear or vice versa.They should never be rotated left toright/right to left.
• Ideally, tire rotation should be done thefirst time after approximately 3,000 miles(5,000 km) and thereafter at 6,000-mile(10,000-km) intervals. Some customersfind that tire rotation may help to getextra mileage from tire life.
• Tire rotation should only be performed iffront/rear tire wear is fairly even andtread height is above 1/16" (1.6 mm).
Storing wheels and tiresWhen storing complete wheels (tires mounted on rims), they should be suspended off the floor orplaced on their sides on the floor. Tires not mounted on rims should be stored ontheir sides or standing upright, but should not besuspended.
CAUTION
Tires should preferably be stored in a cool, dry, dark place, and should never be stored inclose proximity to solvents, gasoline, oils, etc.
WARNING
•
The wheel and tire sizes for your Volvo are specified to meet stringent stabilityand handling requirements. Unapprovedwheel/tire size combinations can nega-tively affect your vehicle's stability andhandling.
• Any damage caused by installation ofunapproved wheel/tire size combinationswill not be covered by your new vehiclewarranty. Volvo assumes no responsibilityfor death, injury, or expenses that mayresult from such installations.
Related information
•
Checking tire inflation pressure (p. 451)
• Tread wear indicator (p. 449)
Tire sidewall designations
The following information can be found on a tire's sidewall.
Federal law mandates that tire manufacturers place standardized information on the sidewall ofall tires (see the illustration). The vehicle has been certified with certain combi- nations of wheels and tires. The following information is listed on the tire sidewall: The tire designation:

INDEX
538
L
Labelslist of 522
location of 521
Laminated panoramic roof 106, 107 Lane Departure Warning settings 340
Lane Departure Warning (LDW) 338, 342
Lane Keeping Aid 338, 340, 342 settings 340
LATCH anchors 78
Leather care 513
Lighting panel 140
Load anchoring eyelets 220
Loading the vehicle 208, 215, 449
Locking 242, 243
Locks and alarm 226
Low beam bulb, replacing 498
Low beams 142, 143
Low Speed Control 399
M
Maintenance 472 hoisting the vehicle 502
performed by the owner 472
Malfunction indicator light 125
Manual front seat adjustment 162
Media player 420, 421 compatible file formats 429
Media player (infotainment system) 424Menus instrument panel 151, 153, 154, 156
Mirrors defroster 195
power door 105
retractable 105
Mirrors, rearview mirror 110
Modem 437Motor oil checking 506, 507
MP3 files 429
Multifunctional front seats 165, 166
MY CAR 111, 112
N
Navigation system voice commands 124
Net cargo 217
O
Occupant safety 60
Occupant weight sensor 84
Octane recommendations 362
Odometer 96Oilchecking 506, 507
Oil quality 530
On-board diagnostics 472
On-board Diagnostic socket 26
On Call Roadside Assistance 14
Opening the hood 504
Options 26
Outside temperature sensor 116
Overhead courtesy lighting 148
Overheating, engine 357

INDEX
541
Steering wheel paddles 160
Stone chips, touching up 516, 517
Storage compartments 208
Studded tires 451Sunroof
laminated panoramic roof 106, 107
Sun shade 109, 111
Sun visor 211
Suspension 400
System updates 474
T
Tailgate locking/unlocking 244 operating with the foot movement sen-
sor 238
power operated 246
wiper/washer 159
Tailgate wipers 509
Technician certification 57Temperature perceived 178
Temperature sensor ambient 116
Tetheringwi-fi sharing 435
Three-way catalytic converter 364 Timer preconditioning 182
Tire inflation pressure 531
Tire Pressure Monitoring System 457, 459 calibrating 460
type approval 461
Tire Pressure Monitoring System (TPMS) 460
Tires 444 changing 453
changing from summer to winter 448
glossary of terms 447
improving economy 444
inflation pressure 451
inflation pressure table 531installing (mounting) a wheel on the
vehicle 456
rotation 445
snow 451
specifications 445
storing 445
studded 451
tire pressure monitoring system 457, 459
tire sealing system 461, 463, 467
tools in the cargo compartment 453
tread wear indicator 449uniform tire quality grading 450
wheel bolts 454
Tire sealing system 461, 463, 467 Top tether anchors (child restraint sys- tems) 80
Touching up paint 516, 517
Towing a trailer 367, 369 trailer hitch 368
Towing eyelet 359
Towing the vehicle 360
Traction control 323
Trailer towing 367, 369 trailer hitch 368
Transmission gear shift indicator 396
general description 395, 396
Hill Start Assist 351
oil 532
shifting with steering wheel paddles 398
shiftlock override 396
Tread wear indicator 449
Trip computer 96, 97, 98 reset 97
Trip odometers 96
Trips, long distance 355
Trip statistics 98