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Old 12-30-2010
t5cents's Avatar
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Electric fan thermostat questions...

ok so im putting an electric fan in my truck cause my stock fan clutch is seized. i have a 16 inch fan that my work was throwing away due to a broken little part on the shroud. so i have it all mounted and every thing and know i need some help wiring it. ok so i can either do a radiator probe or a thread in sensor. the problem i see is that the radiator probe ones are just a on temp and no off temp and i dont want my fan short cycling all the time right around 200-210. it think one that turns on at 210 and off a 195 or so is what i want. now the only ones i can find like that are ones that screw into your intake manifold or the heads somewhere....now on my 3.0 the only ports i see are the couple on the front of the intake manifold but they are all occupied. so can i like run a "T" thing on one of them so i can screw in the stock sensor and the new one? or can i just tap into one of the stock sensors for the temp signal? or is there a good radiator probe one that turns on at 210 and off somewhere around 195? what about is there any that just go on a coolant hose somewhere? thanks

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Old 12-30-2010
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I don't know where I saw it but I've seen a T-adapter that just goes in your radiator hose.

GB :)
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Old 01-03-2011
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Radiator probes ones are easiest. The manifold option is a little harder because you have to find one first and the brass T doesn't always work to well if the sensor is the grounding type. There are tons of the 200-210 on to 195-190 off ones or get an adjustable one.
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Old 01-04-2011
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I had to make my own t-adapter to splice into the upper radiator hose. I tried the T fitting on the manifold but that changed the reading on the OE temp sensor because it was now outside the manifold and thus reading cooler. I had a scanguage II hooked up when I did this, wasnt just relying on the needle, btw. Once I put it back in its place, temp readings were back to normal.

I just had a shop cut a peice of exhaust pipe and weld a bung on it so I could screw the temp sensor in. I wouldve gone with a pre-made adapter but all of them are for either 1/8 or 3/8" NPT thread....Im running 1/2" from Index Sensors & Controls, Inc.. I think its a 210 on, 195 off. Ive posted lots of pics of my setup and i think i even posted my wiring diagram, look it up. Im running a 2-speed fan so youd only need half of the stuff on it. PM me if you have any questions
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