The document provides instructions for what to do if experiencing a heart attack while alone in a car. It advises to not panic, but to start coughing repeatedly and taking deep breaths before each cough. This should be done every two seconds until help arrives or the heart regains its normal rhythm. Coughing and deep breathing helps squeeze the heart to keep blood circulating and can help the heart regain its rhythm, enabling the person to make it to a hospital. The document stresses sharing this information as it could save lives, and that heart attacks can occur at any age.