Hi everyone I am new to the forum despite having owned my prius for about 3 and 1/2 years . I have opened the hood and can kind of pin point the noise to somewhere around the electric motor. It sounds like a pump noise coming on and off. I am wondering what it is? It does not happen all of the time (which is the reason why I have not taken it to the dealer because I have know way of knowing when it is going to make the noise) and only occurs when the car is in ready mode and the engine is off i.e. either at a stoplight or in park with the car on. I guess I cannot post a link to a youtube video until I have made 5 posts so if you type in on youtube prius strange noise and see a video with the user name ianj5142590 then it is mind. The video is also only 13 seconds. If anyone can help me out or if this has happened to them I would greatly appreciate any input.