1996 Ford Aerostar Owner's Manual - Page 69

RWARNING Do not park, idle, or drive your vehicle in dry grass or other dry ground cover. The emission system heats up the engine compartment and exhaust system, which can start a fire. If you consistently start your vehicle in subzero temperatures, use an engine block heater (if your vehicle has this option). Engine Block Heater (If equipped) Engine block heaters are strongly recommended if you live in a region where temperatures reach -10˚F (-23˚C) or below. An engine block heater warms the engine coolant, which improves starting, warms up the engine faster, and allows the heater-defrost system to respond quickly. RWARNING To prevent electrical shock, do not use your heater with ungrounded electrical systems or two-pronged (cheater) adapters. For best results, plug the heater in at least three hours before you start your vehicle. Using the heater for longer than three hours will not damage the engine, so you can plug it in at night to start your vehicle the following morning. NOTE: Be sure to disconnect the engine block heater before driving your vehicle. 68