please help,

[plymcl172]

my RS is making a squeaking noise from the right side of the engine, I thought it was the aux belt but its not, i reved the car and It may have gone does anyone know what it is?

 

[plymcl172]

quick update could it be the clutch release bearing? if it is does anyone know why it went away by revving it ?

 

[edde]

Cambelt/water pump maybe. Howw come you know its not the aux belt?