My TJ has something vibrating in the engine compartment. Its been doing it for over a year now. Been doing a lot of work lately and its starting to get on my nerves. Just now I was outside listening for it. I stated up front and it sounded like it was coming from the fan area. I checked there and nothing. Then I went to the passenger side and it was coming from the driver side. I checked over there and it was coming from the passenger side. I am seriously questioning my sanity at the moment. Anyone have any solutions from experience? It only vibrates when it not moving.