GMC T-Series 1999, Owner'S Manual, Page: 68 / 344

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Running Your Engine While You’re
Parked (Automatic Transmission)
It’s better not to park with the engine running. But if
ever you have to, here are some things to know.
CAUTION:
Idling the engine with the climate control system
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
without the parking brake firmly set. Your
vehicle can roll. 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.
Follow the proper steps to be sure your vehicle
won’t move.