Noticed it today when I had the car idling. Just started. It appears to be coming from the drivers side by the transmission. I suspect it could be the "chirping" that would indicate the Cam Synchronizer going out but I haven't heard "chirping" it was a tick sound more so the sound described, and I've never noticed. The only thing I've done is yesterday I sprayed Engine Degreaser (Black Magic 2 in 1) on the engine, and MAF Cleaner on the sensor. My car has always made a funny sound when the AC or Heat was engaged, and there was load on the transmission. Think its the compressor though, but this sound was different. What do you guys think?