Every Summer, Heartbreaking Deaths Happen When Children Are Left Alone In Hot Cars. More Than 600 U.S. Children Have Died That Way Since 1990. Heat Stroke Can Occur When Body Temperatures Pass 104 Degrees. That Overwhelms The Brain’s Temperature, Causing Dizziness, Disorientation, Confusion, Seizures, And Even Death. Also Be Sure All Occupants Including Pets Are Not Left Alone In Hot Vehicles.