Where is the evap sensor on 1997 aerostar?

On a 1997 Ford Aerostar, the EVAP (Evaporative Emission Control System) sensor, typically referred to as the EVAP vent solenoid, is located near the fuel tank. It is usually mounted on or near the charcoal canister, which is located under the vehicle, towards the rear. You may need to lift the vehicle for better access, and it's advisable to consult the vehicle's service manual for specific details on locating and testing the sensor.