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So it didn't push coolant or overheat with the stock radiator?
I run a half size civic radiator in my Galant vr4 with a 14" spal puller fan and after I first installed it I kept having problems with pushing coolant into the overflow. I tried different radiator caps but the problem still continued. I took the radiator off and took it a shop to have it checked out. Turns out the flange where the radiator cap goes on was warped so the radiator cap would not stay flush on it and allowing coolant to get to the overflow tank.
I had him cut the flange off and weld the hole shut, got a dsm thermostat housing so I can mount the radiator cap on there (the galant vr4 has the radiator cap on the radiator unlike dsm's). As soon I got everything back together the problem went away. No more pushing coolant into the overflow.
I would also suggest that you mount the fan behind the radiator and wire it as a puller. At highway speeds the fan is not usually on so if its front of the radiator it will actually block the airflow to the radiator.
Don't listen to the ones that tell you to get a full size radiator, my car runs cooler with the half radiator and the better fan. The civic radiator actually holds MORE fluid than the stock galant vr4 did.
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