I pressurized the system to about 18 pounds and after about 10 minutes it had lost about a pound. All the while, I was looking at the power steering reservoir and I saw no bubbles.
Adequate?
Edit: I would expect a PS contamination to look more like this:
http://www.ls1tech.com/forums/genera...oler-pics.html
I'm concluding air in teh system and calling it a day. Might just do a bypass of the OEM cooler while I'm at it.