The system should be flushed by removing the return hose to the pump. Siphon the fluid out of the reservoir, replace the filter, fill with fresh fluid, then have a helper start the engine, move the steering wheel slightly side to side with the front wheels off the ground and another helper pours fluid into the reservoir while you direct the return hose to a pan.

I flushed a couple of quarts through which completely purged the system of the old fluid. Disonnecting the pressure hose won't flush steering gear. It's much easier to disconnect the return hose, and the fluid is at low pressure.

My recommendation is to raise the front end off the ground, start the engine, move the steering wheel back and forth gently, while a helper keeps the reservoir full. As long as the reservoir doesn't run dry during this procedure the system should bleed air, but you have to be quick because the reservoir rapidly depletes.

Duke