1992 Chev. Lumina 3.1 L

[mp1642]

I had a power steering fluid leak from the low pressure cooler line. I cut out the rubber portion of the line that was leaking ( crimps from aluminum to rubber ) and installed a new rubber section on line using hose clamps. I refilled power steering fluid and ran engine. No abnormal noises and leak was fixed.
Now I have noticed the power steering is inoperative at idle. As soon as you increase engine rpm's, the power steering works normal.
Prior to the line section repair I did not have any issues with the steering, only the leak that was repaired. The pump/rack was never run empty.
Any hints on where to start and diagnose this???

[maxwedge]

Air in the system is one possibility,. another is debris got into the system during the repair and could be stuck the pressure relief valve in the pump.

[mp1642]

UPDATE:

Confirmed fix: Power steering pump replacement

Checked pressures and found pressures below specs. Flushed lines, rack and replaced pump.

Thanks for the post