Well Im sure the thermoswitch is healthy because I measured the temp at fan activation and it was at proper temp. The radiator wasnt clogged, I flushed everything (and during that process saw that everything flowed just fine anyway). I determined that the distributor was ok so I concluded that the OEM radiator just couldnt keep up with this weather and the heavy traffic. I installed a koyo 2 row and the car has behaved itself. I drove ALL day on side streets running errands (In HOT weather), trying to get it to overheat by driving hard. The best I did was still under half. :thumbup:

Expensive radiator but it will save me from an afternoon of labor and cash had the headgasket blown (plus a machinists fee and possible cylinder damage!).