1996 Ford Aerostar Owner's Manual - Page 217

RWARNING Make sure the spare tire and jacking equipment are stowed and secured in the proper storage location. Preparing to Change the Tire NOTE: To lift your vehicle by other than the front or rear jacking points, be sure to use only hoist adapters with a wide contact surface. 1. Make sure that your vehicle will not move or roll. Put the gearshift in P (Park). Set the parking brake and block the wheel that is diagonally opposite the tire that you are changing. NOTE: Make sure the ignition is in the OFF position. When one of the back wheels is off the ground, the transmission alone will not prevent the vehicle from moving or slipping off the jack, even if the vehicle is in P (Park). To prevent the vehicle from moving when you change a tire, be sure the parking brake is set, then block the wheel (both directions) that is diagonally opposite (other side and end of the vehicle) to the tire being changed. RWARNING If the vehicle slips off the jack, you or someone else could be seriously injured. 237