there was a thread in the performance forum about doing the electrical fan conversion. there was a statement to the effect that if you left the standard thermostat in the fans would be cycling continuously because the thermostat's normal operation keeps temps in too tight a range. blocking off the bypass makes the coolant go through the radiator getting the maximum cooling effect at all times.
1993 300e-2.8 - gone now <sigh>
"Do not adjust your mind, it's reality that's malfunctioning"