Humming noise from front left Options

[boomer3]

Hey guys, just picked up a 94 gt4, i'm loving it! I've noticed a bit of a humming noise from the left front end of the car. The noise is not related to rpms, or whether the car is moving or not. I can hear it while i'm driving, but it comes on and off periodically if i'm idling. Also, when idling if I open up the hood it appears to be coming from somewhere near the airbox, and sounds as if its some type of auxiliary pump or something. When it goes off, I can rev it up a little, and it usually comes back on. Let me know if this is making any sense at all. Thanks for the input!

[lilgreenyoda]

Yeah, in my case, my best guess is my compressor is on its way out. I think I was just sort of imagining things when I'd turn the system off. It doesn't make noise when the A/C light is NOT lit. But when it is, it makes the noise as stated before, and now the belt is chirping, but only when the compressor is on. Anyone have a P/N for a 5sfe compressor?