yes it is!
The idler pulley is between the alternator and the A/C compressor.
Adjustment is on the idler pulley with the tensioner bolt sitting right below the alternator. I also had to loosen the center bolt on the idler pulley before it would move.
the idler pulley.
The idler pulley is attached by a 14mm hex head bolt. Although the pulley turns counter-clockwise, suggesting that the bolt might be left-handed threads, it is in fact right-handed. A 1/2" drive ratchet with a 14mm socket will loosen the bolt if turned in a counter-clockwise direction. Be sure and loosen the belt tensioner, located below the alternator, and loosen but not remove the other alternator bolts, prior to removing the idler pulley.
First you would need to take the serpentine belt off of the engine, and then remove the bolt in the center of the idler pulley. I have included an instructional vieo of how this is done.
Remove your idler pulley first. it is the pulley right next to the alternator.
There is a crankshaft pulley, alternator pulley, power steering pump pulley, AC pulley, idler pulley, tensioner pulley, etc.
to change the one below alternator you need to take belt off take alternator out and bracket to get at it. the tensioner pulley you need to take belt off loosen the three bolt on assembly the pulley itself has reverse threads on it it would be a good idea to change both of them
Are you talking about the "idler pulley"? They are quite simple to change. Loosen the serpentine belt by using a socket on the center of the tensioner pulley, slide the belt off the idler pulley, use a socket to pull the center bolt of the idler pulley and replace the pulley with a new one.
Release the tension using a wrench etc from the idler pulley.
It could be a bearing in an idler pulley.
Your alternator did it come with a pulley installed ? Or did you have to switch the pulley from the old unit ? Is it the same alternator as the old unit? ( size , number , identifcation markings ) if not this can be your problem . On some cars, the idler pulley {usually on the belt tensioner) can squeal. If you squirt some WD-40 or similar lubricant on the front of the bearing (engine off), and the noise goes away, it is probably the bearings in the idler pulley. If this is the case, replace the idler pulley, because the noise will come back after the lubricant gets slung out of the bearing.