strange squeeking...

[K80 NCH]

there is a sqeeking comin from my engine i can only hear it when im idling but my bf says its always there just cant hear it when im revvin any ideas what this might be and how to stop it
thnx

 

[JackoR26]

Maybe you got a bolt stuck?

 

[Chrisjk]

Aux belt/tensioners been changed?