Starting And Operating Your Vehicle; New Vehicle Break-In; Ignition Positions - Hummer 2007 H3 Owner's Manual

Starting and Operating Your
Vehicle

New Vehicle Break-In

Notice: Your vehicle does not need an
elaborate break-in. But it will perform better in
the long run if you follow these guidelines:
•
Keep your speed at 55 mph (88 km/h)
or less for the first 500 miles (805 km).
•
Do not drive at any one constant speed,
fast or slow, for the first 500 miles (805 km).
Do not make full-throttle starts. Avoid
downshifting to brake, or slow, the vehicle.
•
Avoid making hard stops for the first
200 miles (322 km) or so. During this time
your new brake linings are not yet broken
in. Hard stops with new linings can mean
premature wear and earlier replacement.
Follow this breaking-in guideline every
time you get new brake linings.
•
Do not tow a trailer during break-in.
See Towing a Trailer on page 297 for the
trailer towing capabilities of your vehicle
and more information.
Following break-in, engine speed and load
can be gradually increased.

Ignition Positions

LOCK (A): This position locks the ignition. It also
locks the transmission on automatic transmission
vehicles. It will locks the steering wheel on
manual transmission vehicles when the key is
removed. It is a theft-deterrent feature. You
will only be able to remove your key when the
ignition is turned to LOCK.
If you have an automatic transmission, the ignition
switch cannot be turned to LOCK unless the
shift lever is in PARK (P).
With the key in the
ignition switch, you can
turn to four different
positions.
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