How to Install a Fan Override Switch
5,791
Published 2023-08-03
12V override switch = 2 position (on/on) with three terminals on the back. One for the incoming signal, and two terminals for the outgoing signal, depending on which way the toggle is flipped.
In this video I use a 3 position switch, but it was all I could get at the time. The two position switch I show for the high beam/low beam setup in this video is the ideal switch for this fan override application.
The car is a 1966 Mustang Fastback with a 347 Stroker and T5 transmission.
Shot with GoPro Hero 9 with the Media Mod, edited on Davinci Resolve 17.
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All Comments (17)
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Definitely adding this to my 66, thanks for making my life easier!!
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Looks good Andy; same reason planes have redundant systems, you never know when something may stop working. I like the plates you had made up, much cleaner than some of my "handy work" in the past. π
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πππ espectacular mustang, saludos Sr.!!!
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Cool idea to add something to give a little more control over the cooling system. I do like the idea of a little extra cooling if you go to the track with the engine off if necessary.
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Great video. I ran two over ride switches, and two relayβs so the fans run independently. I pig tailed them to the temp sensor so they both get the signal. One for each fan in case one fan died. And i hid them inside the center console roll up door.
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Looks awesome I did the same thing for my electric fan but I used one of the holes under the dash so it was out of sight just had to enlarge it a little and I used the exact same switch lol.
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In this case, all you needed to do is connect a dash toggle SPST to ground on one side and tap the other side directly to terminal #85. This gives you control to run the fan at anytime and if you want it auto, just leave the switch off and the temp sender will do its job (it doesn't care if its gound override or not). The swith you're using SPDT is two completely different controls. You just have to remember to keep it off the "middle" position, that would be bad.
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Awesome love the gages to πππ§ππΊπΈπͺ
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Im attempting to do this setup its a great idea to have capability to turn off, on, and auto. I am using one of those wire controllers that have the adjustable temp knob. It has two terminals that close when a temp is reached. Do you know if your setup would still work? I'm kind of new to wiring and im starting to mock it all up outside. Thanks!
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Curious if this is an option for my 65 with the Holley Sniper? I can set via the system the tun on/off temps but wonder if they have an ON option? I assume if the relay or something went bad it would prevent this. Could I follow the same steps you did with the Sniper installed? Thanks!
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Hey Andy, have you noticed that when the fan does come on when the engine is hot that it does not go off? i have the same setup and my head scratcher is that the placement of the temp switch is right where the coolant comes out the motor. so when the engine is hot, the hot coolant has the switch always activated as the thermostat is always opening even slightly from being hot. wouldnt a better placement be somewhere on the rad indirect of the fan or maybe the drain plug?
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Which radiator and fan system is that? Looks very clean.
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I had to go back to a Mechanical fan and put a single electric in front of the radiator between the grill set to come on @190Β° as a fail safe. What does your mustang typically run at on a hot day?
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I have the opposite issue... fan stays on WAY after the radiator is cold, because the block sensor is still warm... kills the battery... but I do need a kill switch... just pulling the wire is getting old.
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Andy, ive been folowing for quiet some time now. And your cars, and your videos are getting better all the time. Your engine bay now looks really good. But i got to be honest, that braided fuel line looks out of place. It needs rerouted somehow. It just dont look right the way it is. Maybe behind the distributor? Or at least attached to something so its not just flopping in the breeze. I know your very tidy like i am. Thats why i bring it up. Sooner or later, it will bother you.
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what fan is that?
