CK5
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Thermostatic switch for electric fans?

Right, absolutely. The circuit has to have hysteresis.
 
So does anyone have a part number or model of car to get an OE style fan switch? Something thaqt threads into the head or intake?

I would rather have a common part that I can pick up at napa.

I already have the 2 Iroc fans wired up to a relay and an ajustable fan control but I don't like it or the fact it has a probe in my radiator that could fall out.
 
A late 80's/early 90's camaro with dual fans will have the secondary fan switch (on at 240*IIRC) while the primary side on those cars was handled by the ECM. I'd look at the Grand National applications and see what their on/off temp is.

Your Napa should have an "Echlin" catalog with all of their electrical fan switches in it. They tell you how they are wired, thread pitch, and on/off temps. Ask them to let you look at it, find one that you like the temps of, and go with it.
 

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