1997 Ford Aerostar Owner's Manual - Page 80

To clean the windshield, push in the end of the wiper knob. For a constant spray, keep the knob pushed in. After you release the knob, the wipers operate for two to three cycles before turning off (if wipers were off) or returning to the selected setting. NOTE: The addition of bug shields to the front of the vehicle (e.g., shields) may adversely affect the windshield washer system from delivering fluid to the windshield. Devices such as shields are not recommended for your Ford vehicle. Do not try to clean the windshield when the washer fluid container is empty or activate the washers at any time for more than 15 seconds continuously. This could damage the washer pump system. RWARNING Always warm up the windshield with the defroster before you use the washer fluid. In freezing weather, the washer solution may freeze on the windshield and obscure your vision. For information about refilling the washer fluid or replacing your windshield wiper blades, see Windshield washer fluid and Wipers in the Index. Gearshift Lever The gearshift lever on your Aerostar is mounted on the steering column. On the end of the gearshift lever is the OVERDRIVE OFF button. For additional information about the gearshift lever and the OVERDRIVE OFF button, see the Driving chapter. 77