GMC 2002 Envoy - Manual (Page 105)

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Running Your Engine While
You’re Parked
It’s better not to park with the engine running. But if you
ever 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 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).
If you have four - wheel drive, your vehicle will
be free to roll -- even if your shift lever is in
PARK (P) -- if your transfer case is in
NEUTRAL. So be sure the transfer case is in a
drive gear
-- not in NEUTRAL. See “Four - Wheel
Drive (Automatic Transfer Case)” in the Index.
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.