How to change power steering hose on chevy k1500 1989?

https://www.google.com/search?q=2006+Chevy+Impala+replace+power+steering+hoses+and+lines+diagram

There is such a thing as the pump being worn out or defective, and may be not making oil pressure to cause the boost you need to steer.
Sounds like you are ready for a new or rebuilt pump.
If you want to try another thing first, change the low pressure hose and see if that fixed it.
If not, you will need either a rack& pinion or a power steering pump or both.
God bless your efforts,.

Wild guess, there is an internal power steering pump pressure relief valve that is stuck or not operating properly and the pressure is going way above the rated capacity of the hose. May need a new power steering pump. Who is changing your hose? Some chance the hose is not rated for the pressures being developed by the pump.

There may be an issue with a pressure control valve.

http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?pageId=0996b43f80cb3bdbFollow your power steering hoses to your steering and disconnect and use a container to catch fluid,you can also loosen hoses at pump and put towel over hole and blow out line to get all fluid out,make sure when you blow , the other end is secure and fluid doesn't go every where,good to have another person helping.Here's a link on how to bleed.

check here for the hose, Just scroll down on this page http://www.autopartswarehouse.com/partsearch/power_steering_hose.html?apwcid=X1093010841W41260599c6350&apwkwd=chevy+power+steering+hoses=chevy+power+steering+hoses

The Duramax trucks by Chevy and GMC use Hydro-Boost brakes, meaning that they use a hydrolic pump for the brakes and the steering. GM has had real trouble with leaky Hydrlic hoses on all their trucks for a few years (like my truck) for leaking coolant lines from the trans and as I found out today during my oil change, coming from the hydro-boost. These are replacable, but not under warrenty for you or me.

nope you are set to go

Maybe got an air lock/bubble

Pricing vary, depending on where you live and if you want it done at a dealership or at a local shop.It would be about 1hour of labor +price of the hose+power steering fluid. Dealer charges about $70.00 an hour.
You can call the dealer ask how much to change the hose. Also a local shop can gave you an estimate.