I looked into an electric retrofit a few years back because the clutch fan takes a buttload of power. Put on the back burner for the most part but when I was looking seemed everyone was using some sort of Volvo fan/relay setup with real good results. Of course I forgot the particular vehicles involved since then. I changed my thermostat to Stant 14188 185f/85c Thermostat Which proved to be a very good move. Still get the school bus sound but only a few seconds. Then again I don't use AC so not sure how an improvement in that state would be.