2009 SAAB 9-3 inflation pressure

192 Starting and drivingDriving with a roof rack
loadThe maximum permissible roof load is
220 lbs. (100 kg). Note that the roof load
must be included in the car’s maximum per-
missible payload and axle load.
Strong, sturdy roof carriers designed spe-
cially for your car are available from your
Saab dealer. Always secure roof loads
securely.
Driving with a loadThe handling characteristics are affected by
how the car is loaded.
WARNING
 A roof load will affect the car’s center
of gravity and aerodynamics. Be
aware of this when cornering and driv-
ing in crosswinds.
 Adjust your speed to the prevailing
conditions.
 Due to higher aerodynamics drag, fuel
economy may suffer when driving with
a roof rack.
NOTICE Place the heaviest load as far forward
and as low as possible in the trunk.
 Secure the load to the lashing eyes
(see page 139).
 Heavy loads mean that the car’s
center of gravity is further back. As a
result, the car will sway more during
evasive steering.
 Never exceed the permissible load of
the roof box, even if there is room for
more.
 Ensure that the tire pressure is correct
– slight overinflation is preferable to
underinflation.
 The braking distance of a loaded car is
always greater. Keep your distance
from the vehicle in front.
 Do not exceed the car’s permissible
gross vehicle weight or axle load (see
page 284).
 Roof loads can negatively affect tele-
communication.
For further information on tires see
page 240.
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240 Car careTiresYour new vehicle comes with high-quality
tires made by a leading tire manufacturer. If
you ever have questions about your tire
warranty and where to obtain service, see
your Saab Warranty and Service Record
Booklet for details.
Inflation - Tire PressureThe Tire-Loading Information label shows
the correct inflation pressures for your tires
when they’re cold. “Cold” means your vehi-
cle has been sitting for at least three hours
or driven no more than 1 mile (1.6 km).
Notice: Don’t let anyone tell you that
underinflation or overinflation is all
right. It’s not. If your tires don’t have
enough air (underinflation), you can get
the following:
 Too much flexing
 Too much heat
 Tire overloading
 Bad wear
 Bad handling
 Bad fuel economy.
If your tires have too much air (overinfla-
tion), you can get the following:
 Unusual wear
 Bad handling
 Rough ride
 Needless damage from road hazards. Adjust the tire pressure
to match the current
load and speed of the car (see page 291).
The stated tire pressure s apply to cold tires,
i.e. tires that are t he same temperature as
the outside air temperature. Tire pressure
increases as the tires become warm (e.g.
during highway driving) by approximately
4 psi (28 kPa). When the temperature of the
tires changes by 50°F (10°C), the tire pres-
sure will change 2 psi (14 kPa).
Never reduce the pressure of a hot tire. If the
tires are hot when you check them, only
increase the pressure, if necessary.
WARNING
Poor maintained and improperly used
tires are dangerous.
 Overloading your tires can cause overheating as a result of too much
friction. You could have an blow-out
and a serious accident. See “Loading
Your Vehicle” on page 250.
 Underinflated tires pose the same danger as overloaded tires. The
resulting accident could cause serious
injury. Check all tires frequently to
maintain the recommended pressure.
Tire pressure should be checked
when your tires are cold.
 Overinflated tires are more likely to be cut, punctured or broken by a sudden
impact – such as when you hit a pot-
hole. Keep tires at the recommended
pressure.
 Worn, old tires can cause accidents. If your tread is badly worn, or if your tires
have been damaged, replace them.93_US_7carcare_MY09.fm Page 240 Tuesday, April 15, 2008 11:26 AM
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241
Car care
High speed operation
If you’ll be driving at high speeds, speeds of
100 mph (160 km/h) or higher, where it is
legal, set the cold inflation pressure to the
maximum inflation pressure shown on the
tire sidewall, or to 35 psi (244 kPa), which-
ever is lower. See the example below.
When you end this high-speed driving,
return to the cold inflation pressure shown
on the Tire and Loading Information label.
See on page 250.
Example
You’ll find maximum load and inflation pres-
sure molded on the tire’s sidewall, in small
letters near the rim flange. It will read some-
thing like this: Maximum load 690 kg
(1521 lbs) 300 kPa (44 psi) Max. Press
For this example, you would set the inflation
pressure for high-speed driving at 35 psi
(244 kPa).When to checkCheck your tires once a month or more.
Don’t forget your compact spare tire. It
should be at 60 psi (420 kPa).
How to CheckUse a good quality pocket-type gage to
check tire pressure. Yo u can’t tell if your
tires are properly inflated simply by looking
at them. Radial tires may look properly
inflated even when they’re underinflated.
Be sure to put the valve caps back on the
valve stems. They help prevent leaks by
keeping out dirt and moisture.Tire Inspection and RotationTires should be rotated every 10,000 miles
(16 000 km).
Any time you notice unusual wear, rotate
your tires as soon as possible and check
wheel alignment. Also check for damaged
tires or wheels. See “When It Is Time for
New Tires” on page 242 and “Wheel
Replacement” on page 246 for more infor-
mation.
The purpose of regular rotation is to achieve
more uniform wear for all tires on the vehi-
cle. The first rotation is the most important.
When rotating your tires, always use the
correct rotation pattern. Le ft front tire to left
rear. Left rear tire to right front. Right front to
right rear. Right rear to left front.
Don’t include the compact spare tire in your
tire rotation.
After the tires have b een rotated, adjust the
front and rear inflation pressures as shown
on the Tire-Loading Information label. Make
WARNING
Driving at high speeds, 100 mph
(160 km/h) or higher, puts an additional
strain on tires.
Sustained high-speed driving causes
excessive heat build up and can cause
sudden tire failure. You could have a
crash and you or others could be killed.
Some high-speed rated tires require infla-
tion pressure adjustment for high speed
operation. When speed limits and road
conditions are such that a vehicle can be
driven at high speeds, make sure the tires
are rated for high speed operation, in
excellent condition, and set to the correct
cold tire inflation pressure for the vehicle
load.93_US_7carcare_MY09.fm Page 241 Tuesday, April 15, 2008 11:26 AM
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250 Car care
Loading Your VehicleThis is an example of what your vehicle´s
Tire-Loading Information/Certification label
might look like. It is located on the B-pillar
and shows how much weight your vehicle
may properly carry. The label tells you the
proper size, and recommended inflation
pressures for the tires on your vehicle. It
also gives you important information about
the number of people that can be in your
vehicle and the total weight that you can
carry. This weight is called the Vehicle
Capacity Weight, and includes the weight of
all occupants, cargo and all nonfac-
tory-installed options.
Tire Terminology and DefinitionsAir Pressure: The amount of air inside the
tire pressing outward on each square inch of
the tire. Air pressure is expressed in pounds
per square inch (psi) or kilo pascal (kPa).
Accessory Weight: This means the com-
bined weight of optional accessories, for
example, automatic transmission, power
steering, power brakes, power windows,
power seats, radio and air conditioning.
Aspect Ratio: The relationship of a tire´s
height to its width.
Belt: A rubber coated layer of cords that is
located between the plies and the tread.
Cords may be made from steel or other rein-
forcing materials.
Bias Ply Tire: A pneumatic tire in which the
ply cords that extend to the beads are laid at
alternate angles substantially less than 90
degrees to the centerline of the tread.
Cold Inflation Pressure: The amount of air
pressure in a tire, measured in pounds per
square inch (psi) or ki lo pascal (kPa), before
a tire has built up heat from driving. See
“Inflation - Tire Pressure” on page 240.
Curb weight: This means the weight of a
motor vehicle with standard and optional
equipment including the maximum capacity
of fuel, oil and coolant, without passengers
and cargo.
This label can only be found on vehicles
sold in the U.S.
Vehicles sold in Canada have the tire
information label in the glove box, see
page 292.
TIN-codea Manufacturer´s Identification Mark
b Tire Size
c Tire Type Code
d Date of Manufacture93_US_7carcare_MY09.fm
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251
Car care
DOT Markings: A code molded into the
sidewall of a tire signifying that the tire is in
compliance with the U.S. Department of
Transportation motor vehicle safety stan-
dards. The DOT code includes the Tire
Identification Number (TIN), an alphanu-
meric designator which can also identify the
tire manufacturer, production plant, brand
and date of production.
GVWR: Gross Vehicle Weight Rating see
page 285.
GAWR FRT: Gross Axle Weight Rating for
the front axle, see page 285.
GAWR RR: Gross Axle Weight Rating for
the rear axle, see page 285.
Intended Outboard Sidewall: The side of
an asymmetrical tire that must always face
outward when mounted on a vehicle.
Kilo pascal (kPa): The metric unit for air
pressure. There are 6.9 kPa to one psi.
Light Truck (LT -Metric) Tire: A tire used
on light duty trucks and some multipurpose
passenger vehicles.
Load Index: An assigned number ranging
from 1 to 279 that corresponds to the load
carrying capacity of a tire. Maximum Load rating:
The load rating for
a tire at the maximum permissible inflation
pressure for that tire.
Maximum Loaded Vehicle Weight: The
sum of curb weight; a ccessory weight; vehi-
cle capacity weight; and production options
weight.
Maximum Permissible Inflation Pres-
sure: The maximum cold inflation pressure
to which a tire may be inflated.
Normal occupant weight: The number of
occupants a vehicle is designed to seat mul-
tiplied by 150 pounds (68 kg). See “Loading
Your Vehicle” on page 250.
Occupant Distribution: Designated seat-
ing positions.
Outward Facing Sidewall: The side of a
asymmetrical tire that has a particular side
that faces outward when mounted on a vehi-
cle. The side of the tire that contains a white-
wall bears white letter ing or bears manufac-
turer, brand and or model name molding on
the other sidewall of the tire.
Passenger (P-Metric) Tire: A tire used on
passenger cars and some light duty trucks
and multipurpose vehicles. Recommended Inflation Pressure:
Vehi-
cle manufacturer´s recommended tire infla-
tion pressure shown on the tire placard, see
“Inflation - Tire Pressure” on page 240 and
“Loading Your Vehicle” on page 250.
Radial Ply Tire: A pneumatic tire in which
the ply cords that extend to the beads are
laid at substantially 90 degrees to the cen-
terline of the tread.
Rim: A metal support for a tire or a tire and
tube assembly upon which the tire beads
are seated.
Sidewall: The portion of a tire between the
tread and the bead.
Speed rating: An alphanumeric code
assigned to a tire indicating the maximum
speed at which a tire can operate.
Traction: The friction between the tire and
the road surface. The amount of grip pro-
vided.
Treadwear Indicators: Narrow bands,
sometimes called “wear bars”, that show
across the tread of a tire when only
2/32 inch of tread remains. See “When It Is
Time for New Tires” on page 242.93_US_7carcare_MY09.fm Page 251 Tuesday, April 15, 2008 11:26 AM
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252 Car careTread Width: The width of the tire´s tread.
UTQGS: Uniform Tire Quality Grade Stan-
dards, a tire information system that pro-
vides consumers with ratings for a tire´s
traction, temperature and treadwear. Rat-
ings are determined by tire manufacturers
using government testing procedures. The
rating are molded into the sidewall of the
tire. See “Uniform Tire Quality Grading” on
page 244.
Vehicle Capacity Weight: Is the number of
designated seating positions multiplied by
150 pounds (68 kg) plus the rated cargo
load. See “Loading Your Vehicle” on
page 250.
Vehicle Maximum Load on the Tire: Load
on an individual tire due to curb weight,
accessory weight, occupant weight and
cargo weight.
Vehicle Placard: A label permanently
attached to a vehicle showing original
equipment tire size and the recommended
cold inflation pressure. See “Loading Your
Vehicle” on page 250.
Steps for Determining Correct
Load Limit1 Locate the statement “The combined weight of occupants and
cargo should never exceed
XXX pounds” on your vehicle´s
placard.
2 Determine the combined weight of the driver and pa ssengers that will
be riding in your vehicle.
3 Subtract the combined weight of the driver and passengers from
XXX kilograms or XXX pounds.
4 The resulting figure equals the avail- able amount of cargo and luggage
load capacity. For example, if the
“XXX” amount equals 1400 lbs. and
there will be five 150 lb. passengers
in your vehicle, the amount of avail-
able cargo and luggage load capac-
ity is 650 lbs. (1400–750 (5x150) =
650 lbs.). 5 Determine the combined weight of
luggage and cargo being loaded on
the vehicle. That weight may not
safely exceed the available cargo
and luggage load capacity calcu-
lated in Step 4.
6 If your vehicle will be towing a trailer, load from your trailer will be trans-
ferred to your vehicle. Consult this
manual to determine how this
reduces the available cargo and
luggage load capacity of your vehi-
cle.
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