I think i have air in my power steering pump. Is there a way to bleed it or do i just have to drain it and refill it?

 

turn on the truck ,take of the fill cap turn the wheel lock to lock{ all the way right, left. do it a few times. then top off the fluid and see how it feels.

 

Usually this is not much of a problem but there are exceptions.
Another way is make up an air tight rubber/cork or whatever plug assembly with thru pipe, to push in the top of the reservior and using a hand vacuum pump to draw a vacuum.
With the engine running , this takes the air out of the fluid in a hurry.