Electric Fan Temp Sensor Location

[MHarvey]

I just got the thermostat housing for the larger thermostat to fit the F427 intake on the 428....but there is not a threaded hole what where I was planning on the thermocouple for the electric fan...any best solutions to where to mount the fan thermocouple....do I drill and thread into the new thermostat housing...the temp sensor hole behind the distr needs to keep the sensor....ideas?

[Drew Pojedinec]

Do you run a heater core?
If so you can tee into that line in a place that isn't visible and use it for a sensor or gauge, etc.

[MHarvey]

as in...place the sensor in the outflow from the intake manifold to the heater through the dash...what do I use as the t section with threads?  Copper pipes behind the engine?

[RustyCrankshaft]

as in...place the sensor in the outflow from the intake manifold to the heater through the dash...what do I use as the t section with threads?  Copper pipes behind the engine?

A brass pipe T with a couple hose nipples works, probably 10 bucks at your local hardware store. There are also billet T's you could specifically for doing an inline gauge sender if you want to spend a little more money for nicer appearance. Depends on where you plan on mounting the Tee and if it'll be visible.

Is it an aluminum or cast iron thermostat housing? If it's aluminum you could weld a NPT bung in it fairly easy. Cast iron you could braze one in, or tig braze.

https://www.discounthydraulichose.com/32-385.html 2 of those

and 1 of these
https://www.discounthydraulichose.com/33700-08-08-08.html

or if your coolant sender is 3/8" NPT you could use 2 of these style hose barbs
https://www.discounthydraulichose.com/4404-10-06-58-hose-barb-x-38-nptf-male.html

https://www.summitracing.com/parts/sum-221126/overview/  or
https://www.summitracing.com/parts/sum-221102/overview/

Or something that looks a bit less fabricobbled - AutoMeter 2280
https://www.summitracing.com/parts/atm-2280?cm_mmc=ppc-google-_-search-_-brands-_-keyword&gclid=Cj0KCQiA2o_fBRC8ARIsAIOyQ-k630A1RophuyJgbJ2bavuIGe5EbL-66hX1tiMeEi2ZPaT9zUxSmlkaAsqOEALw_wcB

They also make these for 1.25 and 1.5 radiator hoses I think.

Keep in mind that if you are using this method for a fan controller you will need to run a ground wire from whatever adapter you use back to the engine somewhere if it's a one wire sensor that grounds thru the threads.

[Falcon67]

All my stuff uses a thin probe inserted between the fins about midway down one side of the radiator. 

[JamesonRacing]

I added a bung to the side of the radiator, about midway down on the right side.  Fan switches on when the coolant in the radiator needs to be cooled.

[drdano]

I added a bung to the side of the radiator, about midway down on the right side.  Fan switches on when the coolant in the radiator needs to be cooled.

Same here, works like a champ.