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Old 06-25-2008, 03:56 PM   #1 (permalink)
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Where is the best spot to install the thermal fan control switch for my electric fan?

Thread it into the intake somewhere?

I need to check the Amp draw on my fan as well to determine if I can just use a thermal switch, or if I need to use a switch/relay combo.

Or should I just use the switch/relay together anyway?

Also, should the opening & closing temperature switch range match the opening temp of of my T-stat? Or be higher ?

And lastly, I assume a manual over-ride switch would be a good idea as well? Just a little extra insurance incase of a relay failure. Or would the relay fail "open" and it would run continuously ?

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Old 06-25-2008, 04:19 PM   #2 (permalink)
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I usuealy see the thermal switch IN the radiator core. I would set it a little bit below the t-stat so that it can cool the water in the radiator below the temp of the t-stat or the stat will never shut.
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Old 06-25-2008, 05:41 PM   #3 (permalink)
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The most common place is the radiator drain plug with a T fitting.
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Old 06-25-2008, 11:24 PM   #4 (permalink)
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The ideal place is at the lower radiator hose. This isn't always the easiest place, though. I have mine mounted in the t-stat housing on both my '66 and my '69. You don't want it in the intake. You want it after the t-stat.

You DEFINITELY want to use a relay. Any fan that can pull enough air to be efficient, will pull a lot of amps. You'll also want to upgrade your alternator.

An override switch is nice, but certainly not necessary. I don't have one on either of my cars. It would be nice to have at the track, though, to run the fan sitting in the staging lanes, then shut off when I go to the line.
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Old 06-26-2008, 12:33 AM   #5 (permalink)
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Summit has a radiator hose piece (made by Be Cool?) that has two fittings for temp probes. This might work for you.
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Old 06-26-2008, 10:45 PM   #6 (permalink)
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Thanks for all of the replies guys. I appreciate it.
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