It sounds like the power steering pump itself is bad. You mentioned changing the pulleys. Does the vehicle screech or whine when turning the wheel in a parked position? There is also what is called the power steering gear box. They do sometimes go bad as well. I would also look for any leaks in the power steering hoses.
SOURCE: noise from front of motor
Yes the idler pulley can make noise, but not very common. It can do it though.
SOURCE: power steering pump and belt replacement on 1997 olds aurora
More than likely it's the A/C compressor clutch is going bad. Cut the old serpentine belt off and install a shorter belt to bypass the A/C compressor for now.
SOURCE: engine noise
If it gets worse when turning the wheel at a stop, then it's the power steering pump. Could be the power steering fluid also. Check your belts for wear or damage. The idle pulley will make a constant noise, sometimes whining sometime screeching. To check idler pulley it is best to remove belts.
SOURCE: the car is making a grinding/knicking noise it is
could be however the harmonic pulley seems more likely, to check this __ with the engine running put a large srewdriver behind to pulley, next, carefully put your ear to the pulley and see if you can hear the grinding noise from there
SOURCE: 2000 monte carlo how to replace water pump.last bolt
there should be holes in power steering pump pulley that when positioned correctly the bole should go through one of those holes, if not then you have to remove the pump
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