Nigel Posted January 7, 2005 Share Posted January 7, 2005 I'm going to install an electric rad fan, and I intend to use the rad fan controller incorporated with my SDS EM3-6F. For those that are already doing this, if your engine is already hot, does the rad fan come on as soon as you power up the ECU, or does the ECU wait until the engine is running first before activating the fan? Also, why is there an "off" setpoint for the fan in addition to the "on" setpoint? Is this to have the fan turn off at a lower temp than the on temp? I guess this would reduce the frequency of the fan turning on and off. Nigel '73 240ZT Quote Link to comment Share on other sites More sharing options...
mobythevan Posted January 10, 2005 Share Posted January 10, 2005 The on and off set point have to be different so that the cooling fan won't be switched on/off rapidly as you pass one point. A common problem in electronics. The solution is to have hysteresis, on and off points that differ. Filters out noise at the setpoint. Quote Link to comment Share on other sites More sharing options...
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