Chevrolet TrailBlazer 2007 Owner's Manual page 453

A Tire and Loading Information label is
attached to the vehicle's center pillar (B-pillar),
below the driver's door latch. This label
shows your vehicle's original equipment tires
and the correct inflation pressures for your tires
when they are cold. The recommended
cold tire inflation pressure, shown on the label,
is the minimum amount of air pressure
needed to support your vehicle's maximum
load carrying capacity.
For additional information regarding how
much weight your vehicle can carry, and an
example of the tire and loading information
label, see Loading Your Vehicle on page 350.
How you load your vehicle affects vehicle
handling and ride comfort, never load your
vehicle with more weight than it was designed
to carry.
When to Check
Check your tires once a month or more.
Also, check the tire pressure of the spare tire.
How to Check
Use a good quality pocket-type gage to check
tire pressure. You cannot tell if your tires are
properly inflated simply by looking at them.
Radial tires may look properly inflated even when
they're underinflated. Check the tire's inflation
pressure when the tires are cold. Cold means your
vehicle has been sitting for at least three hours
or driven no more than 1 mile (1.6 km).
Remove the valve cap from the tire valve stem.
Press the tire gage firmly onto the valve to
get a pressure measurement. If the cold tire
inflation pressure matches the recommended
pressure on the tire and loading information label,
no further adjustment is necessary. If the
pressure is low, add air until you reach the
recommended amount.
If you overfill the tire, release air by pushing on
the metal stem in the center of the tire valve.
Recheck the tire pressure with the tire gage.
Be sure to put the valve caps back on the valve
stems. They help prevent leaks by keeping out
dirt and moisture.
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