GMC 1997 Safari Owner's Manual page 102

Running Your Engine While
You're Parked
It's better not to park with the engine running. But if
ever have to, here are some things to know.
A
CAUTION:
Idling the engine with the air system control
off could allow dangerous exhaust into your
vehicle (see the earlier Caution under "Engine
Exhaust").
Also, idling in a closed-in place can let deadly
carbon monoxide (CO) into your vehicle even if
the fan switch is at the highest setting. One place
this can happen is a garage. Exhaust
--
with
CO
--
can come in easily. NEVER park in a
garage with the engine running.
Another closed-in place can be
a
blizzard.
(See "Blizzard" in the Index.)
CAUTION:
It can be dangerous to get out of your vehicle if
the shift lever is not fully in PARK (P) with the
parking brake firmly set. Your vehicle can roll.
Don't leave your vehicle when the engine is
running unless you have to. If you've left the
engine running, the vehicle can move suddenly.
You or others could be injured. To be sure your
vehicle won't move, even when you're on fairly
level ground, always set your parking brake and
move the shift lever to PARK (P).
Follow the proper steps to be sure your vehicle won't
move. See "Shifting Into PARK (P)" in the Index.
If you're pulling a trailer, see "Towing a Trailer" in
the Index.