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Right temperature switch for electric fan

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Does anyone know the right part number for a temperature switch that mounts in the coolant neck to control and electric radiator fan?  I already have the neck with three sensor bosses,see Zeebucks pic below. The front-most spot is currently free and I'd like to put a switch in there to control my electric radiator fan instead of the dumb little probe that sticks through the radiator fins, as I have found it to be rather inconsistent. Thanks!


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At 82C it should keep the fan running most of the time even in the winter if it is located on the head outlet with a 80C thermostat on the engine inlet.  Engine will heat the water about 10F (5.5C) as it passes thru the engine.  If mounted in the radiator like an E21 then the fan runs only when the radiator needs more cooling.

Been there and cast it aside.

Edited by jimk

A radiator shop is a good place to take a leak.


I have no idea what I'm doing but I know I'm really good at it.

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  • 8 months later...

For any future searchers that come across this thread, this didn't work out for me quite as planned.  As Jimk indicated, 82C switch is indeed too cold, and unfortunately while the 91C switch is probably OK, I found it a bit too hot for my liking.  Fortunately, I already run Megasquirt and found how to use the Fidle output to drive the fan relay at whatever temperature I want (currently set at 88C/190F), but had I not had that option, I probably would have resorted back to the the temperature probe in the radiator fins or started looking for the right E21 radiator with the sensor mounting boss in the bottom of it.  So there's my thoughts and closure on this one.



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