Auto racket: Hearing aids make an annoying noise when car is running
My hearing aids (Phonak CROS) which I purchased last July sometimes make an annoying loud puttering sound when my car is running. It begins when I start my car. Sometimes the noise subsides; sometimes it continues for the duration of my trip. What could be causing this? The noise seems to be in sync with the motor. Car is a 15-year-old Acura.