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You need to insure there's a minumum of air in the system. There's a small bleeder screw on the intake manifold where it meets up with the head that you can use to insure this happens. Making sure the car is level, open up the screw, and fill your radiator with coolant. Once fluid starts coming up through that bleeding hole (and after you've squeezed the upper radiator hose - air tends to get trapped there), close it back up.
As far as radiator caps go, getting a Stant .9 bar from AutoZone would work.. Or just pay a few extra bucks and get a Nissan cap.
Kevin
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