tire pressure CADILLAC XLR 2007 1.G User Guide

Tire and Loading Information Label
A vehicle specic Tire and Loading Information
label is attached to the center pillar (B-pillar)
of your vehicle. With the driver’s door open, you
will nd the label attached below the door
latch. This label shows the number of occupant
seating positions (A), and the maximum vehicle
capacity weight (B) in kilograms and pounds.The Tire and Loading Information label also shows
the size of the original equipment tires (C) and
the recommended cold tire ination pressures (D).
For more information on tires and ination see
Tires on page 413andInation - Tire Pressure on
page 422.
There is also important loading information on the
vehicle Certication label. It tells you the Gross
Vehicle Weight Rating (GVWR) and the Gross
Axle Weight Rating (GAWR) for the front and rear
axle. See “Certication Label” later in this
section.
Steps for Determining Correct Load Limit
1. Locate the statement “The combined
weight of occupants and cargo should never
exceed XXX kg or XXX lbs” on your
vehicle’s placard.
2. Determine the combined weight of the driver
and passengers that will be riding in your
vehicle.
3. Subtract the combined weight of the driver
and passengers from XXX kg or XXX lbs.Label Example
355

Service........................................................ 363
Accessories and Modications................... 363
California Proposition 65 Warning.............. 364
Doing Your Own Service Work.................. 364
Adding Equipment to the Outside of Your
Vehicle................................................... 365
Fuel............................................................. 365
Gasoline Octane........................................ 366
Gasoline Specications.............................. 366
California Fuel........................................... 367
Additives................................................... 367
Fuels in Foreign Countries........................ 368
Filling the Tank......................................... 369
Filling a Portable Fuel Container............... 371
Checking Things Under the Hood.............. 372
Hood Release........................................... 373
Engine Compartment Overview.................. 374
Engine Oil................................................. 377
Engine Oil Life System.............................. 380
Supercharger Oil....................................... 382
Engine Air Cleaner/Filter............................ 382
Automatic Transmission Fluid.................... 384
Engine Coolant.......................................... 385
Coolant Surge Tank Pressure Cap.............. 388Engine Overheating................................... 388
Overheated Engine Protection
Operating Mode..................................... 390
Cooling System......................................... 391
Power Steering Fluid ................................. 396
Windshield Washer Fluid........................... 397
Brakes...................................................... 399
Battery...................................................... 402
Jump Starting............................................ 403
Rear Axle.................................................... 407
Headlamp Aiming........................................ 408
Headlamp Vertical Aiming.......................... 410
Bulb Replacement....................................... 412
Windshield Replacement............................ 412
Windshield Wiper Blade Replacement....... 412
Tires............................................................ 413
Winter Tires (XLR-V) ................................. 414
Tire Sidewall Labeling............................... 415
Tire Terminology and Denitions............... 417
Run-Flat Tires........................................... 420
Ination - Tire Pressure............................. 422
Tire Pressure Monitor System................... 423
Tire Inspection and Rotation...................... 426
Section 6 Service and Appearance Care
361

Tires
Your 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 GM Warranty booklet for
details. For additional information refer to the tire
manufacturer’s booklet included with your vehicle.
{CAUTION:
Poorly maintained and improperly used
tires are dangerous.
Overloading your vehicle’s tires can
cause overheating as a result of too
much friction. You could have an
air-out and a serious accident. See
Loading Your Vehicle on page 354.
CAUTION: (Continued)
CAUTION: (Continued)

Underinated 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 vehicle’s tires are cold. See
Inflation - Tire Pressure on page 422.
Overinated tires are more likely to be
cut, punctured, or broken by a sudden
impact — such as when you hit a
pothole. Keep tires at the
recommended pressure.
Worn, old tires can cause accidents. If
the tire’s tread is badly worn, or if
your vehicle’s tires have been
damaged, replace them.
413

Low-Prole Tires (XLR-V)
Notice:If your vehicle has P235/45R19 or
P255/40R19 size tires, they are classied as
low-prole tires. Low-prole tires are more
susceptible to damage from road hazards or
curb impact than standard prole tires.
Tire and or wheel assembly damage can occur
when coming into contact with road hazards
like potholes or sharp edged objects, or
when sliding into a curb. Your GM warranty
does not cover this type of damage. Keep tires
set to the correct ination pressure and
when possible avoid contact with curbs,
potholes, and other road hazards.
Winter Tires (XLR-V)
If you expect to drive on snow or ice covered
roads often, you may want to get winter tires for
your vehicle. All season tires provide good overall
performance on most surfaces but they may
not offer the traction you would like or the same
level of performance as winter tires on snow or ice
covered roads.Winter tires, in general, are designed for increased
traction on snow and ice covered roads. With
winter tires, there may be decreased dry
road traction, increased road noise, and shorter
tread life. After switching to winter tires, be alert for
changes in vehicle handling and braking.
See your dealer for details regarding winter tire
availability and proper tire selection. Also,
seeBuying New Tires on page 428.
If you choose to use winter tires:
Use tires of the same brand and tread type on
all four wheel positions.
Use only radial ply tires of the same size, load
range, and speed rating as the original
equipment tires.
Winter tires with the same speed rating as your
original equipment tires may not be available for H,
V, W, Y, and ZR speed rated tires. If you choose
winter tires with a lower speed rating, never
exceed the tire’s maximum speed capability.
414

(E) Tire Ply Material:The type of cord and
number of plies in the sidewall and under the
tread.
(F) Uniform Tire Quality Grading (UTQG):Tire
manufacturers are required to grade tires
based on three performance factors: treadwear,
traction and temperature resistance. For more
information seeUniform Tire Quality Grading on
page 431.
(G) Maximum Cold Ination Load Limit:
Maximum load that can be carried and the
maximum pressure needed to support that load.
Tire Size
The following illustration shows an example of a
typical passenger (p-metric) vehicle tire size.(A) Passenger (P-Metric) Tire:The United
States version of a metric tire sizing system. The
letter P as the rst character in the tire size
means a passenger vehicle tire engineered to
standards set by the U. S. Tire and Rim
Association.
(B) Tire Width:The three-digit number indicates
the tire section width in millimeters from sidewall
to sidewall.
(C) Aspect Ratio:A two-digit number that
indicates the tire height-to-width measurements.
For example, if the tire size aspect ratio is
60, as shown in item C of the illustration, it would
mean that the tire’s sidewall is 60 percent as
high as it is wide.
(D) Construction Code:A letter code is used to
indicate the type of ply construction in the tire.
The letter R means radial ply construction;
the letter D means diagonal or bias ply
construction; and the letter B means belted-bias
ply construction.
416

(E) Rim Diameter:Diameter of the wheel in
inches.
(F) Service Description:These characters
represent the load range and speed rating of the
tire. The load index represents the load carry
capacity a tire is certied to carry. The load index
can range from 1 to 279. The speed rating is
the maximum speed a tire is certied to carry a
load. Speed ratings range from A to Z.
Tire Terminology and Denitions
Air 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 kilopascal (kPa).
Accessory Weight:This means the combined
weight of optional accessories. Some examples of
optional accessories are, automatic
transmission/transaxle, power steering, power
brakes, power windows, power seats, 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 reinforcing materials.
Bead:The tire bead contains steel wires wrapped
by steel cords that hold the tire onto the rim.
Bias Ply Tire:A pneumatic tire in which the plies
are laid at alternate angles less than 90 degrees
to the centerline of the tread.
Cold Tire Pressure:The amount of air pressure
in a tire, measured in pounds per square inch
(psi) or kilopascals (kPa) before a tire has built up
heat from driving. SeeInation - Tire Pressure
on page 422.
Curb Weight:This means the weight of a motor
vehicle with standard and optional equipment
including the maximum capacity of fuel, oil, and
coolant, but without passengers and cargo.
417

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 (DOT)
motor vehicle safety standards. The DOT code
includes the Tire Identication Number (TIN),
an alphanumeric designator which can also identify
the tire manufacturer, production plant, brand,
and date of production.
GVWR:Gross Vehicle Weight Rating. See
Loading Your Vehicle on page 354.
GAWR FRT:Gross Axle Weight Rating for the
front axle. SeeLoading Your Vehicle on page 354.
GAWR RR:Gross Axle Weight Rating for the
rear axle. SeeLoading Your Vehicle on page 354.
Intended Outboard Sidewall:The side of an
asymmetrical tire, that must always face outward
when mounted on a vehicle.
Kilopascal (kPa):The metric unit for air pressure.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 Ination Pressure:The maximum air
pressure to which a cold tire may be inated.
The maximum air pressure is molded onto
the sidewall.
Maximum Load Rating:The load rating for a tire
at the maximum permissible ination pressure
for that tire.
Maximum Loaded Vehicle Weight:The sum of
curb weight, accessory weight, vehicle capacity
weight, and production options weight.
Normal Occupant Weight:The number of
occupants a vehicle is designed to seat multiplied
by 150 lbs (68 kg). SeeLoading Your Vehicle
on page 354.
418

Occupant Distribution:Designated seating
positions.
Outward Facing Sidewall:The side of an
asymmetrical tire that has a particular side that
faces outward when mounted on a vehicle.
The side of the tire that contains a whitewall, bears
white lettering, or bears manufacturer, brand,
and/or model name molding that is higher
or deeper than the same moldings 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 Ination Pressure:Vehicle
manufacturer’s recommended tire ination
pressure as shown on the tire placard. See
Ination - Tire Pressure on page 422andLoading
Your Vehicle on page 354.
Radial Ply Tire:A pneumatic tire in which the
ply cords that extend to the beads are laid at
90 degrees to the centerline of the tread.
Rim:A metal support for a tire and 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 provided.
Tread:The portion of a tire that comes into
contact with the road.
Treadwear Indicators:Narrow bands, sometimes
called wear bars, that show across the tread of a
tire when only 1/16 inch (1.6 mm) of tread remains.
SeeWhen It Is Time for New Tires on page 428.
UTQGS (Uniform Tire Quality Grading
Standards):A tire information system that
provides consumers with ratings for a tire’s
traction, temperature, and treadwear. Ratings are
determined by tire manufacturers using
government testing procedures. The ratings are
molded into the sidewall of the tire. SeeUniform
Tire Quality Grading on page 431.
419

Vehicle Capacity Weight:The number of
designated seating positions multiplied by 150 lbs
(68 kg) plus the rated cargo load. SeeLoading
Your Vehicle on page 354.
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 the vehicle’s capacity weight
and the original equipment tire size and
recommended ination pressure. See “Tire and
Loading Information Label” underLoading
Your Vehicle on page 354.
Run-Flat Tires
Your vehicle, when new, had run-at tires. There
is no spare tire, no tire changing equipment,
and no place to store a tire in the vehicle. Run-at
tires perform so well without any air that a Tire
Pressure Monitor (TPM) is used to alert you
if a tire has lost pressure.If a tire goes at, you will not need to stop on the
side of the road to change the tire. You can
just keep on driving. The shorter the distance you
drive and the slower the speed, the greater the
chance that the tire will not have to be replaced. If
you drive on a deated run-at tire for 50 miles
(80 km) or less and at speeds of 55 mph (90 km/h)
or less, there is a good chance that the tire can
be repaired. The tire can operate effectively
with no air pressure for up to 100 miles (160 km)
at speeds up to 55 mph (90 km/h), but the tire
would then have to be replaced. When a tire
is lled with air, it provides a cushion between the
road and the wheel. Because you will not have
this cushion when driving on a deated tire, try to
avoid potholes that could damage your wheel
and require replacement of it.
420

Some road hazards can damage a tire beyond
repair. This damage could occur even before you
have driven on the tire in a deated condition.
When a tire has been damaged, or if you
have driven any distance on a run-at tire, check
with an authorized run-at tire service center
to determine whether the tire can be repaired or
should be replaced. To maintain your vehicle’s
run-at feature, all replacement tires must
be self-supporting tires. As soon as possible,
contact the nearest authorized GM or run-at
servicing facility for inspection and repair or
replacement. To locate the nearest GM or run-at
servicing facility, call Roadside Assistance. For
phone numbers and Roadside Service details see
Roadside Service on page 487.
{CAUTION:
Run-at tires are constructed differently
than other tires and could explode during
improper service. You or others could be
injured or killed if you attempt to repair,
replace, dismount, or mount a run-at tire.
Let only an authorized run-at service
center repair, replace, dismount, and
mount run-at tires.
The valve stems on your run-at tires have
sensors that are part of the Tire Pressure Monitor
System (TPMS). SeeTire Pressure Monitor
System on page 423. These sensors contain
batteries which are designed to last for 10 years
under normal driving conditions. See your dealer if
you ever need to have a wheel replaced, or if
the sensors ever need replacement.
Notice:Using liquid sealants can damage the
tire valves and tire pressure monitor sensors in
your vehicle’s run-at tires. This damage would
not be covered by warranty. Do not use liquid
sealants in your vehicle’s run-at tires.
421