Temp fan switch location

[Gregster]

Hi does anyone know the best placement for a temp sender switch?
I have a BBC with a Edelbrock intake and have read to install in head or intake. I have a pipe plug in my intake next to the thermo housing and as far as the head I don't know where that would go.
-Greg-

[rbarnes]

Hi - I've located the fan switch both places, with success and some problems. In general, I'd suggest locating the switch near the thermostat housing in the intake.

How close is your thermostat opening temperature to the fan switch turn off temp? This can be a problem when locating the switch in the head.

I once ran a 160 thermostat and a fan switch in the rear of the head that turned on at 185 and off at 170. This didn't work - the switch would come on and not turn off. The temperature drop across the head obviously exceeded 10 degrees, thus the thermostat held the intake temp at 160, and the fan was not able to cool lower.

I moved the switch to the boss near the thermostat housing, and things worked fine. With a larger temperature difference between the thermostat and fan turn off temp, location in the head would work. Hope this helps, ****