Chevrolet 2007 Kodiak Owner's Manual page 235

CAUTION:
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Snow can trap exhaust gases under your
vehicle. This can cause deadly CO (carbon
monoxide) gas to get inside. CO could
overcome you and kill you. You cannot
see it or smell it, so you might not know it
is in your vehicle. Clear away snow from
around the base of your vehicle if any is
blocking your exhaust pipe. And check
around again from time to time to be sure
snow does not collect there.
Open a window just a little on the side of
the vehicle that is away from the wind.
This will help keep CO out.
Run your engine only as long as you must. This
saves fuel. When you run the engine, make it
go a little faster than just idle. That is, push the
accelerator slightly. This uses less fuel for the heat
that you get and it keeps the battery (or batteries)
charged. You will need a well-charged battery (or
batteries) to restart the vehicle, and possibly for
signaling later on with your headlamps. Let the
heater run for a while.
If you have a diesel engine, you may have to run
it at a higher speed to get enough heat.
Then, shut the engine off and close the window
almost all the way to preserve the heat. Start
the engine again and repeat this only when you
feel really uncomfortable from the cold. But do it
as little as possible. Preserve the fuel as long
as you can. To help keep warm, you can get
out of the vehicle and do some fairly vigorous
exercises every half hour or so until help comes.
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