Strange ticking
 

I've had my ac compressor/clutch replaced in the last couple of months, but ever since I got my car its had this intermittent ticking sound while idling. It seems like some days it won't do it at all... but when it does, it will do it all day, no matter how many times I drive it and then park it for a while.

The RPMs are so steady its not even funny, and I've never once had a problem with the way the car runs. The DIC was recently replaced as well. I have no check engine lights... nothing... just this occasional incessant ticking sound that goes away when I hit the gas. Any idea what that is?