Hi, my name isXXXXX am hoping that I will be able to help you with your problem today..
Do you have a servie agreement on this unit with Sears?
The noise you are hearing is a bad bearing in the motor which will also affect the suction power of the unit, this would cost over $200 to have it replaced, at this point I would cut my losses and purchase a new one.....
Your acceptance of my answer if helpful to you, requires that you press the GREEN ACCEPT button, this will allow me to get credit for helping you today, The deposit you paid in the beginning is just that and does not transfer to any experts until you press it...
I cannot know everything since I am not there with you to see all the conditions that the appliance we are talking about,
Pressing the ACCEPT button will not stop me from continue to helping you in the future if needed on the problem we are working on..
Bonuses are welcome if I have helped you a lot, however they are not mandatory