Electric fan temp sensor

[mfahrbach]

I bought a Spal 16" pusher fan (gave up on the lack of space issue for the stock fan on the 261) and also purchased the fan harness kit with relay and a sensor to switch the fan on at 185°. Can anyone tell me where to install that sensor. This is on a 1951 3600 with a 261 engine. And while we are at it, any recommendations on where to mount the relay?

[Deve]

https://webstore.spalusa.com/en-us/p...5-degrees.aspx

Is this what it looks like? I will really like to hear what others think, but I have spent the last few months trying to figure out this exact same problem. Because it has to go into the water stream, there are a limited number of places to put it. You can't put it in the Head because you need your Water Temp Gauge to work. Go here:

http://devestechnet.com/Home/WarningSystem then scroll down a ways to where it says Water Temperature Sensor Installation. It will explain it all in detail.

So, Ron Francis wiring makes a box that connects to the fan wiring and has a Thermistor sensor that has a lug on it for bolting it to the Thermostat Housing. This is also how all new cars are set up to control the fan. It's about $140. https://www.ronfrancis.com/prodinfo.asp?number=AR-88

OR, There is a much cheaper solution ($14.99 plus $5.95 shipping) that is made for this purpose as well here:
http://www.ebay.com/itm/300975365527...%3AMEBIDX%3AIT

I have that in the shop because I am working on a warning box and need it for that. It's a great way to go because there is no need to find a place inside the water stream. Let me know what you find out and feel free to copy/paste this reply anywhere you choose.

[Deve]

New information that may be of help...

http://www.autometer.com/1-1-2-radia...e-adapter.html

[Deve]

More new information...

I called Spal to see what the amperage pull is on their fan systems. The 16 inch fan requires a 40 amp relay and a 30 amp slow blow fuse. This is because at fan startup the system can pull as many as 40 amps for a millisecond or two. Wow! So if you want to use a Thermistor sensor bolted to the outside of the thermostat housing, you can use that circuit but it has to have a 40 amp relay. So, a person could power the 40 amp relay with a lesser 5 or 10 amp relay across the relay coil. The only thing that needs to be 40 amps is the output.