Just noticed this continuous 'breathing' sound like a pump is inhaling and exhaling, and it starts as soon as I start the car and doesnt quit. Its a soft sounding noise nothing too loud, but makes me wonder still. It sounds like its coming from the front of the car. Braking and accelerating dont seem to change the speed of the sound, just stays consistent throughout. I have no idea what it could be, but curious if even has an idea before I take it in.