Chevrolet TrailBlazer 2003 Manual page 96

Leaving Your Vehicle With the Engine
Running
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CAUTION:
It can be dangerous to leave your vehicle with
the engine running. Your vehicle could move
suddenly if the shift lever is not fully in
PARK (P) with the parking brake firmly set.
If you have four-wheel drive, your vehicle will
be free to roll — even if your lever is in
PARK (P) — if your transfer case is in
NEUTRAL. So be sure the transfer case is in a
drive gear — not NEUTRAL. See "Four-Wheel
Drive (Automatic Transfer Case)" in the Index.
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CAUTION: (Continued)
CAUTION: (Continued)
And, if you leave the vehicle with the engine
running, it could overheat and even catch fire.
You or others could be injured. Don't leave
your vehicle with the engine running unless
you have to.
If you have to leave your vehicle with the engine
running, be sure your vehicle is in PARK (P) and your
parking brake is firmly set before you leave it. After
you've moved the shift lever into PARK (P), hold
the regular brake pedal down. Then, see if you can
move the shift lever away from PARK (P) without first
pulling it toward you (or pressing the button on a console
shift lever). If you can, it means that the shift lever
wasn't fully locked into PARK (P).