wheel alignment VOLVO XC90 TWIN ENGINE 2018 Owners Manual

AUDIO, MEDIA AND INTERNET
497
Selecting sub-channels
To listen to a station's sub-channel(s), tap the
station on the screen or press the forward/back
arrow keys on the right-side steering wheel key-
pad or below the screen.
Sub-channels can also be saved as radio favor-
ites.
If you tap a sub-channel favorite, it may take up
to 6 seconds before the channel becomes audi-
ble. If you tap a station while you are out of digital
range of the transmitter, No reception will be
displayed.
Related information
• HD Radio™ (p. 494)
• Activating and deactivating the HD Radio
™
(p. 496)
• Changing waveband and radio station
(p. 491)
• Searching for a radio station (p. 492)
• HD Radio™ limitations (p. 497) HD Radio
™ limitations
Limitations
•
Main channel vs. sub-channels (FM only):
The main channel is the only channel that
can receive in hybrid mode (both digital and
analog). If a frequency has sub-channels,
they are broadcast in digital mode only. The
main FM channel will be displayed as, for
example, "WRIF-FM HD1". The sub-FM
channels will be displayed as"WRIF-FM
HD2", "WRIF-FM HD3", etc.
• Reception coverage area: Due to current
IBOC transmitter power limitations, the
reception coverage area in digital mode is
somewhat more limited than the station's
analog coverage area. Be aware that, like all
radio transmission technology, terrain, time of
day, vegetation and buildings can have a
positive or negative effect on radio reception.
• Analog to digital/digital to analog blend-
ing: Analog to digital blending will occur as
the signal strength reaches a preset thresh-
old in the receiver. This will be noticeable in
fringe areas (areas with weak reception) and
is normal.
NOTE There may be a noticeable difference in
sound quality when a change from analogue
to digital or digital to analogue occurs, such
as:
• Volume increase or decrease
• Equalizer settings, i.e., Bass/ Midrange/
Treble cut or boost
• Time alignment (Digital program material
in extreme cases can be as much as 8
seconds behind the analogue). This will
noticeable as a "stuttering" effect.
The above items are dependant on the
broadcaster's equipment settings and do
not indicate a fault in the vehicle's radio
receiver or antenna systems.
Related information
• HD Radio™ (p. 494)
• Activating and deactivating the HD Radio™
(p. 496)
• HD Radio
™
sub-channels (p. 496)

WHEELS AND TIRES
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551
imprinted on the sidewall of the tire. The last four
digits in the series is the Department of
Transportation (DOT) stamp and indicates the
week and year the tire was manufactured. The
tire in the illustration has 0717 as the last four
digits, which means it was manufactured week 7
of 2017.
Tire ageTires degrade over time, even when they are not
being 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 can
accelerate 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 with
e.g., visible cracks or discoloration should be
replaced immediately.
Tire economy
• Maintain correct tire pressure.
• Avoid fast starts, hard braking and tire
screeching.
• Tire wear increases with speed.
• Correct front wheel alignment is very impor-
tant.
• Unbalanced wheels impair tire economy and
driving comfort. •
Tires must maintain the same direction of
rotation throughout their lifetime.
• When replacing tires, the tires with the most
tread should be mounted on the rear wheels
to reduce the chance of oversteer during
hard braking.
• Hitting curbs or potholes can damage the
tires and/or wheels permanently.
Tire rotationYour vehicle has no required tire rotation. Driving
style, tire pressure, climate and road conditions
affect how quickly the tires age and exhibit signs
of wear. Maintaining the correct tire pressure
helps keep tread wear evenly distributed.
To help prevent differences in tread depth and
wear patterns forming on the tires, the front and
rear wheels should be rotated, i.e. the front tires
moved to the rear and the rear tires moved to the
front. Ideally, tire rotation should be done the first
time after approximately 5000 km (ca
3100 miles) and thereafter at 10,000 km
(approx. 6200 miles) intervals.
If you have any questions regarding tread depth,
Volvo recommends consulting an authorized
Volvo workshop. If significant differences in wear
(> 1 mm difference in tread depth) between the
tires have already occurred, the least worn tires
should always be mounted on the rear wheels. A
front-wheel skid (understeer) is usually easier to control than a rear-wheel skid (oversteer). If the
front wheels skid, the vehicle will continue in a
straight line instead of the rear wheels skidding
to the side, which could cause you to completely
lose control of the vehicle. It is therefore impor-
tant that the rear wheels never lose grip before
the front wheels.
Storing wheels and tiresWhen storing complete wheels (tires mounted on
rims), they should be suspended off the floor or
placed on their sides on the floor.
Tires not mounted on rims should be stored on
their sides or standing upright, but should not be
suspended.
CAUTION
Tires should preferably be stored in a cool,
dry, dark place, and should never be stored in
close proximity to solvents, gasoline, oils, etc.
2
Not available on all models.