i have a whining noise ive noticed on and off lately noticed it a few weeks ago then it went away its been windy here the past few days with a lot of dust. I noticed a bad on and off whining/kinda grindy when cold starting now it goes away once i start driving but i can still here a slight whiny noise.. Its really the best way i can describe it. How would i be able to diag which pully it is, if it even is a bad pulley.
Sounds very much like the A/C compressor pulley. Mine was the exact same way, squealing in the cold mornings then quieting as it warmed. By the time i got to the pulley(admittedly i had a new one riding in my glovebox for a month) the bearings had seized so badly the pulley had begun to melt around it. Not even a week later, exact same thing in my dads subaru as well.
I do know the AC bearings/pully take a dump fairly quickly on your car. That's why I asked if you were sure it's not a belt. But I'm with Mr Mello above. Only way to check it would be to cut the acc belt or take it off and see if it still does it.
2002 WRX Sold
2007 WRX Sold
2007 STi totaled
2007 Foz XT sold
No need to cut it. Just lower the alternator, take off the front belt, then detension the A/C pulley tension bracket(and be gentle doing it, as its a metal screw in a plastic piece that's more then likely been made brittle by 10 years of heat and cold) and pop out both the pulley and belt. If you cant hold the middle of the pulley and spin it freely with one finger, it needs to be replaced.