Power steering question

[dave`12]

My old C10 has been pressed into service due to my DD being in the shop. After driving 1/2 hour or so in Miami heat (95 today), I noticed that the powersteering was making a little noise - kinda like when low on fluid. It's not real loud, you almost have to listen for it. It's also a tiny bit harder to turn. I've not noticed this before in light the service she usually gets.

It's an add on power steering unit from a PO.

Fluid is good, belt is not slipping. I'm at work now, curious if it does the same when it's cooled down tonite when I leave.

Couple of terrible pics attached that might help in id. These are old pics from a thread when I was putting the engine in, so ignore loose wires, etc


Any ideas, should I be worried?

Thanx

[dave`12]

Truck is cold now. Started it, power steering seemed normal. Good, I guess, but puzzling.