High pitched squealing , replaced serp. belt.. still squeals

it is the belt it is either to tight or not tight enough

You need to check the pulley alignment of all the pulleys, they should all be in a perfectly straight line, otherwise the belt will squeal

The high pitch squeal ia most likely the serpentine belt on the front of the engine you can buy some belt dressing from the part store and put it on there and fix that or some soap will work also, the belt may also need to be tightened. As for the egg smell if it smells like eggs it's the catylitic converter doing it's job and is normal, although you should not be able to smell it inside the car when driving you may have an exhaust leak and could be very dangerous carbon monoxide exposure.

excess mechanical drag from the pump can cause the belt to slip and squeal, but before focusing on the pump I'd check the condition, tension and alignment of the belt. I might even try cleaning all the pulleys with an aerosol brake cleaner and install a new belt, particularly if the current one has more than 50,000 miles on it. It might be that the squeal is coming from or caused by a different belt-driven accessory.
A more typical noise from a power-steering pump is a high-pitched whine, not a squeal. Usually, if the steering wheel is stationary, meaning that the steering rack is not "asking" for assistance from the high-pressure fluid from the pump, there's little or no noise

check the serp. belt for glazing ont he smooth side and for cracks on the side with all the ribs, if you have either, it's time to replace it. either way, you should remove the belt and spin and rock each pulley back and forth to check for wear or grinding. alsoif this squealing happens only with your ac or windshield defrost on, it's possible that your ac compressor has seized.

it could be the engine belt or the brakes are bad listen to where it coming from and you will know which you have to change

have Your alternator belt checked for the propper tension:]

replace the serp belt and check idler and tentioner pullys. serp belts make noise after antifreeze or oil has been on them. good luck