Hi Greg, I live in Phoenix, Arizona, I use a 12 inch hayden fan, using an on/off switch. I flip the switch on once the motor is running and leave it on until I turn the motor off. I run a closed system radiator with a 7 lb. cap. My TR-3 has an old motor and runs 210 degrees on a hot summer day and I have used this set up for 3 years. I removed my front pulley snout from the sheet metal pulley halves. I took my trusty Saw-all and cut the tapered end of the snout and the flange that the fan bolts to, leaving the thick (1/2 inch thick) mounting area to be bolted back to the sheet metal pulley halves. I then had to go to the hardware store and buy a shorter bolt and flat washer to replace the front pulley bolt. I just use the electric fan and thats all. Good Luck, Bill C. Mesa, Az.