Try to stay dry. Cover all exposed parts of the body. Build a fire for heat and to attract attention. Place rocks around the fire to absorb and reflect heat. Melt it first.
Disorientation occurs quickly in wind-driven snow and cold.
Make sure the exhaust pipe is not blocked. Turn on the dome light at night when running engine. Raise the hood indicating trouble after snow stops falling. Exercise from time to time by vigorously moving arms, legs, fingers, and toes to keep blood circulating and sto keep warm. Stuff towels or rags in cracks under doors.