Noises at idle when in drive stopped

What is your question?

I was stopped at a stop light after I had just went through a puddle of water and it started making noises from the motor on the pulley side. But when revved up a little it stopped. And didnt make the noise but a couple miles down the road it started doing the same thing stopped at a stop sign. Revved up a little again it stopped when accelerating to leave stop sign it tried to make the noise again barley heard it and then it stopped. Is this a pulley problem? Also tried turning on and off heater to see if that was problem because had heater running during the sound and that didnt make a difference so dont think that's involved with it. Also did same thing with the AC and nothing so dont think it's the pump. Also want to add have never heard this noise or had problems with this car in the past very well taken care of and kept up on maintenance.

How long has your 2007 Ford Five Hundred had this problem?

Just today