First check to make sure the fluid is topped off. If low there may be a leak in the system and you need to put fluid in the reservoir that has stop leak in it. If the problem continues then the pump is probably starting to go bad and you will want to replace it before it goes out. Last, Some Power Steering pumps just make noise and you have to deal with it. Do some research on your car and see if other people say the same thing. It is common for some makes/ models to have the same problems.
probably not the alternator if it happens when only turning its gotta be the power steering or steering rack make sure everything is greased up could be the PS pump going out
There are two possibilities when it comes to a squeaking sound when turning. The main reasons are a bad power steering pump, or a steering linkage issue.
Ball joints.
A Trailblazer that squeaks only when turning to the left could have a problem with the steering or front wheel bearing. Turning to the left puts the right pressure on the parts to cause them to squeak.
If the squeeling is coming from the tires, then the problem is most likely a misaligned front end. If the squealing is coming from the engine, then the problem would be in the power steering system.
could be your steering is messed up for the turning. but for the transmission you could have blown piston
It could be low fluid in the power steering pump.
could be where your power steering fluid is cold and thick
The problem is probably in the steering gear. Clogged passages in steering gear. Leaks in steering gear.
If a car engine stalls when turning, there could be a problem with the power steering pump. There could also be an issue with an emissions control device.
could be the power steering belt, axle going bad. power steering pump it self could also be bad.
could be several places, power steering hose, rack and pinion (or steering gear box) or power steering pump.