It could be that your tie rod ends have worn out and when you drive, you hear the noise they make, due to vibration and steering tension.  Also, it could be that there is a leak in your power steering fluid from the container, or in the wiring that leads to or from the container.  There could be any number of reasons, and if you go to autozone.com and ask the experts there, they can probably give you advice that will identify the problem.  Sounds to me like you are being flooded with expenses with this car.  I hope its worth it to you.  I have spent so much money on LABOR for small repairs that I am going to trade my car in for something new.  At least that way whatever goes wrong will be under warranty.  I am getting a Hyundai because the warranty is great, and finally, now I can quit worrying about repair bills.