'91 XJ, 4.0, AX15, NP231, D30, 29 spline 8.25, A/C if it matters.
Well, I'm a little baffled by this. Here's the background. About 4 months ago I replaced my clogged stock radiator with a CSF 3 core brass and copper. (Very nice upgrade, BTW. The system's cooling ability is drastically...