It's probably a bad bearing or bushing in the pump, not the pulley itself. Does the shaft wiggle with the pulley? That would let you know.
The pump and pulley should be replace at the same time, but you can buy pulley, you will need to have autozone loan you the puller. You will have pay full price as deposit but bring back and there is no charge.
SOURCE: removing power steering pump
To replace the power steering pump, proceed as follows:
SOURCE: Whistle noise when starting cold car
its proberly what they call a secondary air intake pump - what this does is increase the air flow only on cold start up - the colder it is the longer it stays on - if the noise gets louder and you will notice - get it changed - we have the same problem over here on the vauxhall omega and corsa's - bless em got to be GM
SOURCE: 2001 Chevrolet Tracker Steering Issues
i would check the power steering fluid level. if thats ok. then i would bet its your power steering pump. other possibilities although rare are :
if its power assisted rack and pinion, rack may need to be replaced if its damaged or corroded on the inside. or could be a pinched hose in the power steering hose routing. Wrong fluid in the power steering pump (causing the valves to swell shut) this happens when quick lube places put the wrong fluids in the wrong places. ( i went to one and they put the wrong fluid in my brakes and had to have my master cylinder replaced and brake system flushed... yes they denied it still cost me 350.00) also could be damaged suspension parts causing the resistance to your steering. hope this gives you some leads to find out whats up.
SOURCE: rattling noise
the most common source of rattles is the exhaust system and the shocks being loose.
SOURCE: Power steering working OK slight squek in pully and pully vibrati
HI, these signs will confirm a pump structure failure and i would recommend replacing this power steering pump.
1. Remove serpentine belt
2. loosen power steering pressure and return hoses
3. Remove nut from pressure line mounting on alternator bracket
4. remove power steering pump mounting bolts.
5. Lift pump assembly from engine mounting and remove hoses.
6. Reverse order to install. Fill and bleed system.
NOTE: A new or rebuilt power steering pump will most likely not come with a pulley attached. You will need a power steering pulley remover/installer tool to transfer the pully from the old pump to the new one.
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