Help! pully making a noise

[cornbread8787]

I don't know what this pully is for or what it goes to. It is the top pull on top of the alltnator and a metal hose that goes to the pollution pump. I need to know what to ask for whe I order my part? Thanks in advance

 

[boomdriver]

I don't know what this pully is for or what it goes to. It is the top pull on top of the alltnator and a metal hose that goes to the pollution pump. I need to know what to ask for whe I order my part? Thanks in advance

are you talking about the air pump?:confused