how to wire in aftermarket radiator fans?

[driftrex]

ok so i want to get my new fans wired up tomorrow but im not sure how to wire them up, the factory plugs has 3 wires and my 2 new highflow fans only have two wires.

im guessing the factory ones would be positive, negative and a switching wire, id like to get my new fans to switch on only when needed as they used to, but am unsure how to do this.

can someone enlighten me please.

[Guest boostin]

No, factory are 2 speed.

[NotAWhiteGTB]

yeah, thats what i thourght... get an adjustable thermistor and have your fans come on slightly earlyer thatn factory too.

[driftrex]

 boostin said:

No, factory are 2 speed.

so can i hook up to two wires then? and leave one wire off, or do i join the 2 different speed wires together? obviously i'd like the fans to be running at full speed whenever they are on.

i dont really need to make them come on earlier with an adjustable thermostat, my link my even be able to be set to turn them on lower anyway, im not sure, will look into that when it comes to tuning.

[Guest boostin]

The Link may only have 1 speed. Just run it and see what wires have power and earth when they switch on.

[driftrex]

 boostin said:

The Link may only have 1 speed. Just run it and see what wires have power and earth when they switch on.

problem with doing that is i cant actually start the engine yet, all the piping isnt there yet.

[Guest boostcut]

then radiator fans are the least of your worries.

[driftrex]

 boostcut said:

then radiator fans are the least of your worries.

still have to be wired up though.

[Guest boostcut]

not to get your motor goin they dont. it will be 5 seconds to wire up. the other way is test your fan with a battery and work out which wire is which. then just match the plug up.

[driftrex]

 boostcut said:

not to get your motor goin they dont. it will be 5 seconds to wire up. the other way is test your fan with a battery and work out which wire is which. then just match the plug up.

yea thats a good idea actually but i dont have any factory fans anymore to test with, i think boostin got them with my old radiator. i just thought someone here might know of the top of their head which of the 2 wires to use.

im doing all the piping at the same time, but just wanted to do the fan wiring so i dont have to take the radiator back out. im doing a million things at the same time at the moment. im off work this week so trying to get as much done as possible.

[Guest boostin]

I got a bit of your stuff, but not your radiator....

[driftrex]

 boostin said:

I got a bit of your stuff, but not your radiator....

hmmm ok was one of you aucklanders haha

soooo, i need to steal a factory fan from somewhere.......

[wrx_lou]

I got one sitting in the boot of my car.

[driftrex]

 wrx_lou said:

I got one sitting in the boot of my car.

you a bit far away though, might have to see if sub-a-roo spares will lend me one on tuesday.

[wrx_lou]

I also have a battery and a pair of wire strippers :

[driftrex]

 wrx_lou said:

I also have a battery and a pair of wire strippers :

ah i see what you mean haha, would be awesome if you can suss out which wire does what for me

[wrx_lou]

PM me you cellphone bro.

[driftrex]

 wrx_lou said:

PM me you cellphone bro.

done, thanks.

[driftrex]

i just found a wiring diagram but focked if i can work it out haha.

another question, do both fans operate at the same time, regardless of aircon been off? i see one labeled as main fan and the other as sub fan.

been so long since my cars been going i cant remember.

[driftrex]

http://ken-gilbert.com/wrx/mans/pre97/WiringDiag.pdf

page 28, anyone good at reading diagrams, cause im not.

[wrx_lou]

That made me confused. Do you have one or two plugs?

[driftrex]

 wrx_lou said:

That made me confused. Do you have one or two plugs?

haha yea, i have two plugs, F19 and F20 in that diagram, both fans seem to operate independantly but i get lost where it all goes into the aircon relays lol.

at least the earths are easy to work out though ;D

[Guest boostin]

Some have the RH fan on low for A/C, and then on high for cooling, and the LH on low and high for cooling, while others have both low for A/C and both high for cooling. Don't worry too much about what does what when. Just find the low speed and earth wires and hook them up to those.

[driftrex]

 boostin said:

Some have the RH fan on low for A/C, and then on high for cooling, and the LH on low and high for cooling, while others have both low for A/C and both high for cooling. Don't worry too much about what does what when. Just find the low speed and earth wires and hook them up to those.

so after getting lost with that diagram i was just doing some google searching on fitting aftermarket fans on 3-wire subarus, one manufacturer recommends to splice the two positive wires together to work with their 2-wire thermo fans, so that way it still has its low/high functions.

does this sound right boostin?

this is a quote on Nasioc, for mishimoto aftermarket 2 wire fans:

Mishimoto

02-03-2010, 05:15 PM

The fan shroud kit comes with 2 12" Slim fans pre-assembled.

You would have to cut off the harness, yes and manually wire them in. If you have a 3 wires going to your OEM fan (high/low speed set-up), wire the two positive wires to the blue wire on the Mishimoto fan, and the ground to the black wire on the Mishimoto fan.

If you have a 2 wire set-up, Black is Negative/Blue is Positive, and then you should be done!

[Guest boostin]

Yeah that should work. I guess the low speed circuit shuts off when the high speed switches on. I've never checked to be sure though.