
CLIMATE CONTROL
232
Heater
The heater helps the engine and passengercompartment reach the correct temperaturebefore and while driving.
The heater has two sub-functions:
Parking heater - heats the passenger com-partment as needed when the parking cli-mate's preconditioning is activated.
Auxiliary heater - heats the passenger com-partment and engine while driving.
The heater is a high-voltage coolant heater and ismounted in the front right-side wheel housing.
Battery and charging
The heater is powered by the vehicle's hybrid bat-tery. If the charge level in the hybrid battery is toolow, the heater will switch off automatically and amessage will be displayed in the instrumentpanel.
NOTE
Make sure that the battery has sufficientcharge if the heater must be used.
Related information
Climate (p. 200)
Parking heater
The parking heater heats the passenger com-partment as needed before driving if precondi-tioning is activated.
The parking heater is one of two sub-functions ofthe vehicle's heater. The heater is mounted in thefront right-side wheel housing.
The parking heater starts automatically if theparking climate's preconditioning is activated andthe passenger compartment needs to be heated.
It switches off automatically when a set timertime or the heater's maximum run time expires, orif the car is restarted.
The heater's maximum running time is 40minutes.
Additional heater
The auxiliary heater helps heat the passengercompartment and engine while driving.
The auxiliary heater is one of two sub-functionsof the vehicle's heater. The heater is mounted inthe front right-side wheel housing.
The auxiliary heater is started and controlledautomatically when extra heat is required whilethe vehicle is being driven.
It switches off automatically when the ignition isswitched off.

STARTING AND DRIVING
}}
475
Emission controls
Three-way catalytic converter
Keep your engine properly tuned. Certainengine malfunctions, particularly involving theelectrical, fuel or distributor ignition systems,may cause unusually high three-way catalyticconverter temperatures. Do not continue tooperate your vehicle if you detect enginemisfire, noticeable loss of power or otherunusual operating conditions, such as engineoverheating or backfiring. A properly tunedengine will help avoid malfunctions thatcould damage the three-way catalytic con-verter.
Do not park your vehicle over combustiblematerials, such as grass or leaves, which cancome into contact with the hot exhaust sys-tem and cause such materials to ignite undercertain wind and weather conditions.
Excessive starter cranking (in excess of oneminute), or an intermittently firing or floodedengine can cause three-way catalytic con-verter or exhaust system overheating.
Remember that tampering or unauthorizedmodifications to the engine, the Engine Con-trol Module, or the vehicle may be illegal andcan cause three-way catalytic converter orexhaust system overheating. This includes:altering fuel injection settings or compo-nents, altering emission system components
or location or removing components, and/orrepeated use of leaded fuel.
NOTE
Unleaded fuel is required for vehicles withthree-way catalytic converters.
Heated oxygen sensors
The heated oxygen sensors monitor the oxygencontent of the exhaust gases. Readings are fedinto a control module that continuously monitorsengine functions and controls fuel injection. Theratio of fuel to air into the engine is continuouslyadjusted for efficient combustion to help reduceharmful emissions.
Related information
Octane rating (p. 473)
Fuel (p. 472)
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

WHEELS AND TIRES
}}
557
imprinted on the sidewall of the tire. The last fourdigits in the series is the Department ofTransportation (DOT) stamp and indicates theweek and year the tire was manufactured. Thetire in the illustration has 0717 as the last fourdigits, which means it was manufactured week 7of 2017.
Tire age
Tires degrade over time, even when they are notbeing used. It is recommended that tires gener-ally be replaced after 6 years of normal service.Heat caused by hot climates, frequent high load-ing conditions or Ultra Violet (U.V.) exposure canaccelerate the aging process. The temporary
spare 2 should also be replaced at 6-year inter-vals, even if it has never been used. A tire withe.g., visible cracks or discoloration should bereplaced immediately.
Tire economy
Maintain correct tire pressure.
Avoid fast starts, hard braking and tirescreeching.
Tire wear increases with speed.
Correct front wheel alignment is very impor-tant.
Unbalanced wheels impair tire economy anddriving comfort.
Tires must maintain the same direction ofrotation throughout their lifetime.
When replacing tires, the tires with the mosttread should be mounted on the rear wheelsto reduce the chance of oversteer duringhard braking.
Hitting curbs or potholes can damage thetires and/or wheels permanently.
Tire rotation
Your vehicle has no required tire rotation. Drivingstyle, tire pressure, climate and road conditionsaffect how quickly the tires age and exhibit signsof wear. Maintaining the correct tire pressurehelps keep tread wear evenly distributed.
To help prevent differences in tread depth andwear patterns forming on the tires, the front andrear wheels should be rotated, i.e. the front tiresmoved to the rear and the rear tires moved to thefront. Ideally, tire rotation should be done the firsttime after approximately 5000 km (ca3100 miles) and thereafter at 10,000 km(approx. 6200 miles) intervals.
If you have any questions regarding tread depth,Volvo recommends consulting an authorizedVolvo workshop. If significant differences in wear(> 1 mm difference in tread depth) between thetires have already occurred, the least worn tiresshould always be mounted on the rear wheels. Afront-wheel skid (understeer) is usually easier to
control than a rear-wheel skid (oversteer). If thefront wheels skid, the vehicle will continue in astraight line instead of the rear wheels skiddingto the side, which could cause you to completelylose control of the vehicle. It is therefore impor-tant that the rear wheels never lose grip beforethe front wheels.
Storing wheels and tires
When storing complete wheels (tires mounted onrims), 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.
2Not available on all models.

WHEELS AND TIRES
564
Adjusting tire pressure
Tire pressure decreases over time, which is nor-mal. The tire pressure must therefore beadjusted to maintain the recommended tire pres-sure.
Use the recommended inflation pressure for coldtires for optimal tire performance and wear.
NOTE
To help prevent incorrect inflation pressure,pressure should be checked when the tiresare cold. The tires are considered to be coldwhen they have reached the same tempera-ture as the ambient temperature (about 3hours after the vehicle was last driven). Afterdriving for a few kilometers, the tires will warmup and the pressure will increase.
1. Remove the valve cap from the tire and pressthe air pressure gauge firmly onto the valve.
2.Inflate the tire to the correct inflation pres-sure; see the tire pressure placard on thedriver's side B pillar for recommended pres-sures for factory-mounted tires.
3. Screw the valve cap back on.
NOTE
After inflating a tire, always replace thevalve cap to help prevent valve damagecaused by gravel, dirt, etc.
Use plastic valve caps only. Metal capscould corrode and become difficult toremove.
4. Visually inspect the tire to make sure thereare no nails or other embedded objects thatcould puncture the tire and cause air leak-age.
5.Check the sidewalls to make sure there areno gouges, cuts, bulges or other irregulari-ties.
6. Repeat this procedure for each tire, including
the spare tire5.
NOTE
If you have overfilled the tire, release air bypushing on the metal stem in the center ofthe valve. Then recheck the pressure withyour tire gauge.
Some spare tires require higher inflation pres-sure than the other tires. Consult the tireinflation pressure table or the inflation pres-sure placard.
Related information
Recommended tire pressure (p. 565)
Checking tire pressure (p. 563)
Inflate tires with the compressor included inthe tire sealing system (p. 583)
Approved tire pressure (p. 673)
5Not available on all models.

WHEELS AND TIRES
}}
* Option/accessory.567
Calibrating the tire pressure
monitoring system*
In order for the tire pressure monitoring system 9
to function correctly, tire pressure reference val-ues must be set correctly. This must be doneeach time the tires are changed or the tire pres-sure is adjusted.
For example, when driving with a heavy load or athigh speeds (over 160 km/h (100 mph)), tirepressure should be adjusted to the Volvo-recom-mended tire pressure values. The system shouldthen be recalibrated.
1.Switch off the ignition.
2. Inflate the tire to the correct inflation pres-sure; see the tire pressure placard on thedriver's side B pillar for recommended pres-sures for factory-mounted tires.
3. Start the vehicle.
4.Open the Car Status app in App view.
5.Tap TPMS.
NOTE
The car must be stationary when calibration isstarted.
6.Tap Calibrate.
7.Tap OK to confirm that the tire pressure inall four tires has been checked and adjusted.
8.Run the car until calibration is complete.
Calibration is done when the vehicle is driv-ing at a speed above 35 km/h (22 mph).
If the car's ignition is switched off before cal-ibration is complete, the tires in the centerdisplay change color from gray to green uponnext start-up, even if calibration is not com-plete. Perform the calibration again and allowit to complete within the same operatingcycle to ensure that the calibration is carriedout correctly.
> When enough data has been collected forthe system to detect low tire pressure, thecolor of the tire symbols in the center dis-play will change from gray to green. Thesystem will not provide any other confir-mation that calibration has been comple-ted.
If start-up of calibration fails, the followingmessage appears: Calibrationunsuccessful. Try again..
9Tire Pressure Monitoring System (TPMS)

||
WHEELS AND TIRES
576
WARNING
The vehicle must never be driven withmore than one "Temporary Spare" tiremounted.
Driving with a spare wheel may alter thedriving characteristics of the vehicle.Replace the spare wheel with a normalwheel as soon as possible.
The spare wheel is smaller than the nor-mal wheel, which affects the vehicle'sground clearance. Watch for high curbsand do not wash the vehicle in an auto-matic car wash when a spare wheel ismounted.
Follow the manufacturer's recommendedtire inflation pressure for the spare wheel.
On all-wheel drive vehicles, the drive onthe rear axle can be disconnected.
If the spare wheel is mounted on thefront axle, snow chains must not be used.
The spare wheel must not be repaired.
CAUTION
The vehicle must not be driven with wheels ofdifferent dimensions or with a spare tire otherthan the one that came with the vehicle. Theuse of different size wheels can seriouslydamage your vehicle's transmission.
Related information
When changing wheels (p. 570)
Recommended tire pressure (p. 565)
Accessing the spare wheel
Follow these instructions regarding handling thespare wheel.
The spare wheel is stored in a bag and should besecured with two straps onto the floor of thetrunk/cargo compartment when the vehicle isbeing driven. The straps should be strappeddown crosswise over the wheel, attached to theload anchoring eyelets and pulled taut.
Wheel changing tools are located under thecargo compartment floor.
Related information
Spare wheel (p. 575)

WHEELS AND TIRES
}}
577
Snow tires
Snow tires are designed for winter driving.
Volvo recommends snow tires with specificdimensions. The tire dimensions vary dependingon engine type. When driving with snow tires, thecorrect type of tires must be mounted on all fourwheels.
NOTE
Contact a Volvo dealer for advice on the bestchoice of rims and tires.
Tips for changing snow tires
When switching between regular tires and snowtires, mark the tires according to which side theywere mounted on, e.g. L for left and R for right.
Studded tires
Studded tires should be broken in by driving500–1000 km (300–600 miles) slowly and gen-tly to help the studs settle properly in the tires.This gives the tire, and especially the studs, alonger service life.
NOTE
Regulations regarding the use of studdedtires vary from country to country.
Tread depth
Road conditions with ice, slush and low tempera-tures place considerably higher demands on tiresthan summer conditions. Volvo therefore recom-mends not driving on snow tires that have a treaddepth of less than 4 mm (0.15 inch).
Related information
When changing wheels (p. 570)
Winter driving (p. 468)
Tread wear indicator (p. 559)
Snow chains
Using snow chains and/or snow tires can helpimprove traction in winter driving conditions.
WARNING
Use Volvo genuine snow chains or equivalentsnow chains that are suitable for the vehiclemodel and the tire and wheel sizes. Only one-sided snow chains are permitted.
If uncertain about snow chains, Volvo recom-mends contacting an authorized Volvo work-shop. Use of the wrong snow chains couldcause serious damage to the vehicle andresult in an accident.