Steering wheel becoming stiff even when driving forward, why?

My 2005 ford freestyle steering wheel was making noise the power steering fluid was leaking had the pump changed, but now a squeling noise is coming from the front and the steering wheel is becomin stiff when turning… What can this be?

Perhaps the air was not fully purged after the pump was changed. Take it back to the mechanic.

Loose belt

Have you checked the belt for tightness? There should be no play in it at all. When was the pump changed? The pump is self purging by turning the steering wheel all the way to the left and right half a dozen times.