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The Hicas solenoid has a sliding piston or valve inside that is pulled one way or the other by one of the electromagnets on each end. (I think) This just directs pressure into one line or the other that runs to the back to actuate the rack R or L. When the HICAS isn't actuated (the piston just sits in the center and fluid doesn't run through the lines that go to the back) the fluid just flows through the solenoid from the high pressure input straight back to the return line port to the reservior.
I just don't see how there would always be directional flow. It's not like one line is the supply line and dthe other is the return. One is pressurized when you turn left at speed and vice versa.
If I'm wrong about the above(which I may be after rethinking it), I would guess they could be both pressurized all the time and then the solenoid may just cut the pressure to the other side when turning, producing the same effect of differential pressure at the rack. But point is I don't think there is a feed and return at all times. If both lines have equal pressure in them when you aren't turning, you aren't going to get any flow through a cooler.Russell Floyd
Russell Floyd Z1 Motorsports
www.300zx.com
1990+ Nissan Z specialists Used Parts, New parts, Service/Repair and Performance 2877 Carrollton Villa Rica Hwy
Carrollton, Ga 30116 770-838-7777
770-832-9253 (fax) 
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