Does anyone know at what water temperature the radiator fans are supposed to kick on?

Looking at the fsm for the 200sx se-r, it says that the fan should turn on at 212F, with a/c off, with a/c on the a/c fan runs constant, on manual trans. If you have an automatic, it has low and high speed. On automatic trans., low speed is at 203F and high speed is at 221F at idle. If you have auto with a/c on, you should hear the a/c fan run constant. Hope that helps.

Thanks that's exactly what I needed. Just a side question- where in the FSM did you find that? I have an FSM for a '93 G20, and I was going crazy trying to find it. Thanks a lot for the help.