Is this a squeak noise, or a moaning noise perhaps?
Does it change with steering?
Ok, it sounds like you have a power steering noise.
First, I recommend checking your power steering fluid, if it is low, it can howl.
Also, if it is low it may be leaking. I recommend checking for leaks, the power steering rack is common to leak on these vehicles.
If your fluid level is ok, I would recommend performing a power steering flush. This will require a flush machine, so you will probably need to take it to a service department.
If after the flush, you still have that noise, you most likely have a power steering rack going bad. It will need to be replaced. This is a pretty expensive job, so I would have another techinician look at it before performing any repairs.
I hope this helps!