1997 Ford F150 Owner Guide 1st Printing - Page 88

Starting the vehicle. Using the heater for longer than three hours will not harm the engine, so the heater can be plugged in the night before starting the vehicle. To prevent electrical shock, do not use your heater with ungrounded electrical systems or two-pronged (cheater) adapters. Guarding against exhaust fumes Although odorless and colorless, carbon monoxide is present in exhaust fumes. Take precautions to avoid its dangerous effects. If you ever smell exhaust fumes of any kind inside your vehicle, have your dealer inspect and fix your vehicle immediately. Do not drive if you smell exhaust fumes. These fumes are harmful and could kill you. Have the exhaust and body ventilation systems checked whenever: • the vehicle is raised for service • the sound of the exhaust system changes • the vehicle has been damaged in a collision 89