Noise when idling in neutral but goes away when press clutch in

[Trouble]

Hey so I just bought my used Mazda 3 a month ago and its a 2007 2.0L sedan. The clutch went out soon after so I got it replaced it with the exedy oem one. The shop said they replaced everything that came with the clutch kit which I guess is the clutch disk, pressure plate, and throwout bearing. Also they machined the flywheel. Since then the clutch has been great and no more slipping! But yesterday when I had the A/C on and no radio I could hear this quiet whirring or belt noise coming from the front, and the odd thing is that when I press the clutch down it goes away. So I turned the A/C off and the noise was still there but very quiet and same thing when I pressed the clutch it goes away. Its a very quiet noise and maybe is been there the whole time? You have to turn the radio off to hear it. I've done some research and some people are saying throwout bearing and some say input shaft bearing and some say its just normal gear box noise. Any ideas? (Noise only happens when car is at stand still in idle and in neutral with clutch pedal not press in)

[morganc]

A throwout bearing that is going bad typically makes noise when you press the clutch (loaded up). I don't know if I'd worry that much about it. Mine (2010) makes a non-concerning noise in Neutral, because you have to consider, you're spinning up the main input shaft. Gears/shafts/bearings do make noise.

[barodadevil]

Same problem with my Mazda. When left idle without pressing clutch it gives me a noise of small motor running. But when clutch is used the noise goes away.

[Reddie1337]

Mine has the same noise. I am just waiting till I actually need the clutch done, then I'll worry about it, its just an annoying noise. Mine happens whenever the clutch is engaged, even when I am just taking off, it makes the noise too. I don't notice it when I am driving though. Just when I'm at idle, and when I start to move again.