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Old 04-13-2003, 04:08 AM   #1
smew
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Default radiator fan switch

Is it possible to run a switch off the radiator fans that would allow me to turn them on any time i wanted? I looked at the fans, theres four wires going into each, Yellow, Black, Blue, and Green (I think). I would also like to maintain stock function as well, so they turn on automatically, but i can also turn them on whenever.
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Old 04-13-2003, 10:55 AM   #2
Austin
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Turn your AC on.

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Old 04-13-2003, 08:40 PM   #3
smew
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I guess thats what i'm looking for... Doesn't that also turn the A/C compressor on? I'd prefer to have just the fans runnning to avoid extra draw on the engine... and I'm trying to avoid using the A/C with the hopes that after this summer i'll be willing to get rid of it completely. Unfortunately, i don't think that i'll make it, I live in oklahoma (d'oh).
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Old 04-13-2003, 10:36 PM   #4
smew
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anyone know what the four wires are? aka how to splice into them to create a switch... If it was just three, i could probably figure it out on my own, but i have no clue what the fourth one is...
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Old 04-13-2003, 10:45 PM   #5
Mulder
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The fans have high and low speeds and are controlled by relays. Any manual switching should be done at the relay side, not directly at the fan motors. You should get the wiring manual for the car and it will have all the info you need, you can order just the wiring volume of the service manual and it won't be that expensive.
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Old 04-14-2003, 01:59 AM   #6
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excellent, thank you
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Old 05-16-2003, 08:27 AM   #7
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That is what I looking to do turn them on high when ever i want and still able to have the ecu run them when I leave the switch in the off pos.
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Old 05-16-2003, 08:37 AM   #8
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Old 05-16-2003, 09:21 AM   #9
lstepnio
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I'm curious why you would want to do this?
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Old 05-16-2003, 10:04 AM   #10
RiftsWRX
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I've installed Hayden's adjustable fan controller in line with the stock fan controller system. I need to snap some pics tommorow and do the DIY. That should have everything YOU would need to know to just wire up a manual switch.

Jorge (RiftsWRX)
www.ProjectWRX.com
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Old 05-16-2003, 12:09 PM   #11
Austin
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Quote:
Originally posted by lstepnio
I'm curious why you would want to do this?
To keep the fans on/keep airflow across the radiator when you're sitting still.

Do a nice 120mph 18psi 4th gear pull, then stop quickly on the side of the road to make some adjustments... see how quickly you heat up to 96C.
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Old 05-16-2003, 12:11 PM   #12
lstepnio
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I'm just a little suprised you guys are doing this. Shouldn't the thermostat just automaticly kick on the fan?
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Old 05-16-2003, 04:36 PM   #13
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The reason is the water thermostat is set at 176 iirc and the fans don't kick on until ~205 or so. I would be nice to have the fans come on at 185 or 180. I wonder if the fan kick-on is ecu driven? If so it could probably be reset with deltadash, ecutek, etc....
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Old 05-16-2003, 05:30 PM   #14
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Default I Have your Answer!

If you want the fans to come on without A/C then you just need to pull the relay under the hood in the fuse box(to your right while looking at the car). I have done this several times when at he drag strip and it works pretty good. All you do after you remove the relay is turn on the car like you were running A/C and the fans will come on but the compressor will not. Very easy to do and will not hurt the car. Just make sure you remove it and put it back in while the car is OFF.

-Matt
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Old 05-16-2003, 07:23 PM   #15
WRXBob
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I put an auxlilary relay and wires the fan #2 to come on around 180F. Sound complicated but there is only two wires hook up. One to ground and one to the relay. The relay is a thermal switch and does not requires power to run. It grounds the ECU fan #2 signal wire (green with white stripe in engine compartment fuse box) and turns on the fan when temp reach a preset level. Temperature goes up fast, as soon as I drive, the fan turns off, but I can just pull in the drive way and 30 seconds later the fan comes on. Only fan#2 can be overide. Fan #1 overide gave me a check engine light. BTW, pulling AC relay is a good idea, may be the AC wire signal can be route and control by a switch inside the car.
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