I just installed an aluminum radiator and electric fan in my truck and I'm having a little difficulty getting the thermostat to stay open. With a 195 deg on / 175 deg off thermal switch installed in the water jacket on the head to operate the fan the 180 deg thermostat is constantly opening and closing. I know that I need to change the switch out to a hotter one, but how much hotter?
By the way, I'm running a bone stock 230 in front of a T-5 and 3.73 rear end. At 70 MPH I'm running ~ 2000 RPM and the temp varies between 160 and 180. The thermostat opening and closing is very distinct on the gauge. I only have to live with this for a few months until I swap in a 350 so I might just put a toggle switch in line with the thermal switch to turn off the fan while I'm in cruise mode, but if someone else happens to drive the truck (which happens on rare occasion) that is not familiar with the toggle I'm afraid that they would burn up the motor. Thoughts?
