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Old 02-29-2008, 10:03 AM
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Question on using an sensor for turning on/off electric fans?

I have an electric sensor already in my intake manifold on my Chevy 350 for an electric temp gauge. Can I run a wire from this sensor to control an electric fan setup? I wasn't sure how the electric signal would be effected by running a second wire from it. I could always add a second sensor to control the fans I guess.

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Old 02-29-2008, 10:16 AM
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Hi Joe,
That's the wrong type of sensor.
You'll need one that will turn your fans on & off at a predetermined temps. ie on at 210* off at 180*
Take care,
Rich
PS http://store.summitracing.com/egnsea...115+4294860934

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Old 02-29-2008, 10:18 AM
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Looking at the kits I saw in summit, the sensors looked pretty identical. An electric wire runs to a separate switch that does the "on at 200 off at 190" type control. I assumed that the sensor controls resistance through the wire to activate the on and off settings of the switch.
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Old 02-29-2008, 10:23 AM
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look at the bottom of the first page of the link I put there for summit.
Rich
And part #prf30110
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Old 02-29-2008, 11:33 AM
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Thanks for clearing that up for me. Makes a little more sense now!
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Old 02-29-2008, 12:42 PM
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I designed a little comparator circuit that parallels the existing temperature gauge. It's high impedance front end has no effenct on the gauge. It requires a relay however. If you have any electronics assembly skills, I could send the diagram to you.

Cam
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Old 02-29-2008, 12:46 PM
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IMHO, any thrmal fan switch required a relay. There are control modules that turn the fan off and on based on a thermally variable resistance, but that is different than a true switch. I believe most fan switches are simple reed switches activated by the temperature around them. These are a little too delicate to be consistently switching 30 amps off and on. Whatever you do, I strongly recommend a relay.

Pat
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Old 02-29-2008, 12:50 PM
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Cam, Could you send me the diagram to at least check out what you came up with? I know enough to be dangerous.

Pat, I agree with you on the relay. I have a handful of new bosch relays on hand. I've put them to good use upgrading most of the electrical items in my '70 Impala.
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