2lt_Scort Std fan does a better job in traffic - this could be due to size restrictions on the thermo I'm running.
I was going to say the opposite.. mine is quite small as well. Although I have never fitted a radiator shroud with a std fan, which I guess makes a difference.
i fitted one when I was looking for fuel economy (after fuel injecting, so the ECU could handle the fan control). The thermo fan only clicked on after sitting in traffic for 5 mins or so. Driving around normally it never comes on which has got to be better than spinning the engine fan all the time.
Anyway back to the original question the easiest way is to just remove the fan leaving the pully and belt. Get a thin thermo fan and bolt it direct to the radiator core, just put some aluminium on the other side so you don't damage the core.
Andrew