ok iknow this is grand prix forums but ive got a 99 montana 3.4 and i thought the power steering was going out,well the power steering pump is were the belt is and this noise is coming from the area around the throttle body and it sounds very similar to the bad power steering pump noise and it only does it when it the vans temp opens up and everything gets hot and down the road but does nothing when first cranked and drove,so what could it be???