The Ambulance (1990)

Watch The Ambulance: Josh Baker meets a very special woman, Cheryl, in the streets of New York. Suddenly she collapses, and she's picked up by an ambulance. When Josh wants to visit her in the hospital, it appears that she hasn't been admitted in the hospital. Josh follows the roommate of Cheryl, and she disappears after a ride in the same ambulance. It's up to Josh to solve the secret behind this strange vehicle.