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Old 06-20-2008, 10:52 AM
 
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350 electric fan switch

OK guys I have a toyota FJ with a 350 conversion. Currently it has an electric fan, and although I am not totally on board with the electric fan, it is what is there for now. My question is: The fan is manually controlled by a toggle switch and I want to change it to a thermostatically controlled switch. I purchased a sender transmitter switch, but it looks like it is already in use with an over temp switch. What is the best way to go about automatically controlling this fan.

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Old 06-20-2008, 11:14 AM
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I am using an adjustable fan controller from derale. It has very good instructions and includes a relay and in-line fuse. Very reasonable cost through Summitt.
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Old 06-20-2008, 01:03 PM
 
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Thanks Houston54. In looking at them on Summet, if you see the threaded sending switch on some of the packages, do you know where this threaded unit goes. The one I have on the block looks like it goes to the temp guage in the cab. Is their an additional location on the block for the switch location.
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Old 06-24-2008, 06:11 AM
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Suggested locations:

The stock temp sensor is probably on the driver's side of the block. There is an identical threaded hole on the passenger side of the block. This location is a little harder to use if you have headers.

Another common location is one of the threaded holes in the intake manifold. My Edelbrock intake had three tapped holes that could be used. I'm using the one closest to the water neck.

Some water necks for 350's have a threaded hole in the top.

Most guides will say that the block mounted sensor will measure a higher temp than an intake mounted sensor, but I've tried both locations and they seem to be almost the same on my 350.

Bruce
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Old 06-24-2008, 08:22 AM
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I have my sending unit installed into the intake manifold.
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Old 06-24-2008, 09:28 AM
 
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Thanks again guys. I will give my manafold another look over, and I found the one hiding on the passenger side so it looks like I am good to go. You guys have been a great help. Also, just a little FYI, the adjustable fan controller from derale seems to be on back order until the end of July so I went with a similiar contoller, but that one seemed to be an excellent solution.
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Old 06-24-2008, 11:37 AM
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Actually the positions on the drivers side and passenger side are in the heads not the block. And they are right...the ones in the heads will read a little higher than the ones in the intake manifold. I prefer the ones in the heads myself. Also it is best to go the whole nine yards and use a relay when wireing up your fan system.....why risk a fire because you did not? The set up at Summit with the fan temp sensor switch and the relay and instructions that was mentioned in a previous post is what you need.



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Old 06-26-2008, 06:35 PM
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Agree with Henry here. In addition, these little thermal switches are not designed to carry the amperage necessary to run a fan. They are designed to carry the amperage necessary to trigger a relay. The relay will run the fan.

Pat
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Old 06-26-2008, 07:42 PM
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Definitely use a relay or that thermal switch wont last long.

Chet
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Old 07-02-2008, 11:48 PM
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Go down to your local speed shop they should have a fan control. Mine has a probe that goes between the fins in the radiator and an adjustment knob to set the temp. I think it was about $20-25.

Here is the one I have at Summit

http://store.summitracing.com/partde...5&autoview=sku

Josh
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Old 07-03-2008, 10:07 AM
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I usually use the adjustable unit that screws into the radiator drain petcock bung, then you can adjust it via your temp gauge for your own preference of temp to kick on. the only downside is it makes draining the radiator a mess! The one in my coupe has a separate bung that griffin radiators welded in just for the sender!
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