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wiring a manual switch to my fan....tengo una pregunta!

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Old Mar 15, 2002 | 10:46 PM
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From: Greenwood, Indiana
Car: 1984 Trans Am
Engine: Vortec 355
Transmission: TH-700R4
Axle/Gears: GM Axles and GM 3.73
wiring a manual switch to my fan....tengo una pregunta!

ok this is what this guy e-mailed me about on how to do it
Locate the existing fan relay. It has the following wires: Orange, black/red, tan/white and green/white. Splice (do not cut) into the green/white wire with a new section of 18-gauge wire. In other words, "tee" into the existing green/white wire. Connect the new wire to a toggle switch. Ground the other switch connector. The fan will now turn on with the switch as long as the ignition switch is on. A lighted switch can be used, but it complicates the wiring slightly.

ok my question is......where is the fan relay located?
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Old Mar 17, 2002 | 12:21 AM
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From: Greenwood, Indiana
Car: 1984 Trans Am
Engine: Vortec 355
Transmission: TH-700R4
Axle/Gears: GM Axles and GM 3.73
BTT


i CANT find it!!!
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Old Mar 17, 2002 | 10:32 AM
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From: Omaha, NE
Car: 1992 Camaro RS
Engine: 406 SB
Transmission: TH350
You dont have to find the fan relay. Get under the front of your car and find the hot wire that runs to the fan, theres 2 wires, just use a tester while the fan is running. Then splice a wire into that and run that up to a place where you can reach it. Then go to a parts store such as Autozone and buy a 12v Relay. Wire that to a hot power wire, a ground, the wire from the fan and then run a thin wire into the cabin through the firewall opening above the brake and gas pedal. Hook this up to a switch and theyre you go. That is the safest and easiest way, or get a 12v 50amp or so rated switch and skip the relay all together and wire it direct, but always use a fuse just incase something goes wrong.

Andrew
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Old Mar 17, 2002 | 12:24 PM
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From: Greenwood, Indiana
Car: 1984 Trans Am
Engine: Vortec 355
Transmission: TH-700R4
Axle/Gears: GM Axles and GM 3.73
whoa......thats a lot of stuff....lol

thanks for the info.....if i cant find the existing relay then i will do what you said.....thanks!
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Old Mar 19, 2002 | 01:26 AM
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dread's Avatar
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I did the same with my rad fan... couldnt figure out why it wasnt working (tried new relay and new fan) eventually i said screw it, and wired a switch right up into console, so when she starts getting above normal temperature, i just switch it on
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Old Mar 19, 2002 | 01:34 AM
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one way i did it is to connect my fan to the fuse that controlls my dash lights and whenever I cut my dash lights(marker lights) my fan comes on. alota camaros look good with there marker lights on so thats just how I wired mine up. just to give ya an idea.
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Old Mar 19, 2002 | 02:00 AM
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From: So.west IN
Car: 87 Formula/ 00 Xtreme
Engine: TPI 305/ v6
Transmission: struggling t-5/ 4l60E
Axle/Gears: 3.08/ 3.23
This is a (general wire colors for all) fan relay setup. The relay can usually be found on the passenger side radiator support. Keep in mind an LG4 fan will probably not be controlled by the ECM but, instead by the fan switch in the pass. side head.

http://www.deadbird.org/tech/fan.gif

Last edited by deadbird; Mar 19, 2002 at 09:43 PM.
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Old Mar 19, 2002 | 04:02 PM
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From: Greenwood, Indiana
Car: 1984 Trans Am
Engine: Vortec 355
Transmission: TH-700R4
Axle/Gears: GM Axles and GM 3.73
ok so it does run to the ECM

well then i will just take that out and look for the wire and splice it there....then i wont have to run it through the firewall

thanks
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Old Mar 19, 2002 | 09:24 PM
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ThirdGen Stoner's Avatar
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My LG4 ECM controled my fan. So I am having to do this too (removed the ECM)
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Old Mar 19, 2002 | 09:46 PM
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From: So.west IN
Car: 87 Formula/ 00 Xtreme
Engine: TPI 305/ v6
Transmission: struggling t-5/ 4l60E
Axle/Gears: 3.08/ 3.23
I'd be somewhat willing to bet the ECM did not control the fan on the LG4
Attached Thumbnails wiring a manual switch to my fan....tengo una pregunta!-86fan.gif  
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Old Mar 20, 2002 | 09:51 PM
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Dude, your g**. But im too stupid to know how to read that diagram. Well maybe you could answer my question I just posted. Without my ECM will the fan still work?

Thanks
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Old Mar 20, 2002 | 09:58 PM
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ThirdGen Stoner's Avatar
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From: North Carolina
Ok i found the wire that plugs into the fan. And TRIED to follow it. I think i followed it to the firewall. Anyway, I would still like to know whether or not it will work. THanks
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