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 is because coughing squeezes the heart and keeps blood circulating, while deep breaths get oxygen into the lungs. This technique can help the heart regain its normal rhythm and potentially get the victim to a hospital until help arrives. The document stresses sharing this information widely as it could save lives, and that heart attacks now occur in people of all ages due to changes in lifestyle.