Hi, I have a very strange thing happening. It's not a big problem and my vehicle runs perfectly. It's more puzzling than anything. Ok, I normally keep my unit parked outside under a carport. But this past Friday I moved into the garage next to my work bench. It was about 9PM and I was working on another project reading some instructions when I first notice this faint sound coming from my Z6. It was a very quiet evening and I could only hear an occasional cricket every once in a while. Anyway, I notice a faint sound coming from near the engine area of my Z6? I tried to rationalize to figure out what it was? It sort of sounds like a faint horn and sounds about every 1.5 to 2 minutes? It's really hard to describe in words what it actually sounds like. I thought it might be a dying mouse or rat?? Then I thought it might be electrical so I disconnected the negative cable to the battery, but it's still there? Anyone have any idea what this is?? Like I said my unit runs fine, everything works great. Thanks for any ideas or suggestions you may have.