Engine making howling noise. All fluids are full, have checked PS pump, does not appear to be from it, and water pump has been replaced. Vehicle doesn't overheat, and no problems turning steering wheel. What else can I check on this?

 

Could be a tensioner pulley bearing or idler pulley bearing.

 

Remove the serpentine belt and start it up. If the noise is gone you know it's something the belt drives such as Tizzy1's suggestion.

 

Thanks. I'll give it a try. Will post if I figure it out correctly.