GMC Envoy 2003 Owner's Manual page 270

Here are some things to do to summon help and keep
yourself and your passengers safe:
•
Turn on your hazard flashers.
•
Tie a red cloth to your vehicle to alert police that
you've been stopped by the snow.
•
Put on extra clothing or wrap a blanket around you.
If you have no blankets or extra clothing, make
body insulators from newspapers, burlap bags, rags,
floor mats – anything you can wrap around
yourself or tuck under your clothing to keep warm.
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You can run the engine to keep warm, but be careful.