I get a low pitched whine towards the front of the engine after driving for 20+ minutes on the freeway. It comes on at random, but ONLY after freeway droning for a while

If I'm just driving around town it wont come on... I've popped the hood and the sound is definately coming from the front of the engine... but I cannot pinpoint where...

Anyone know what it could be?

 

Do you have a cai?

 

Not currently, but there was obviously one installed before I had the car.
There is an INJEN sticker on the mini window wind blocker, as well as some hoses with red INJEN letters on them, also the right side fender liner was cut.

I have gone over all the vacum hoses and made sure they are all tight, and on correctly... Anything else I should check?

 

I made sure the belt was tight today... don't think it is that

 

anyone?

 

no clue

 

you sure its from the front? Maybe its the fuel pump..

 

I figured it out

It's coming from the alternator (that I replaced about a month ago)

Should I take it out and attempt to grease the pulley or something?