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Old 02-01-2010, 03:36 PM   #1
Mishimoto
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Join Date: Apr 2009
Default How to: Install a Mishimoto Electric Fan

Hey everyone!

We thought it would be nice to post up a quick guide on how to wire up a Mishimoto Electric fan.

We hope this is helpful and can answer any questions!

MATERIALS NEEDED:

- 1 x 5 post relay
- 2 x 10 AMP fuses
- 15 feet of 18 gauge wire

Instructions:

Run a 12 volt positive wire to the relay (put a 10amp fuse in this wire). The other side of this relay is the positive connection to the fan.

The ground from your fan can be grounded to the body of the car. Make sure its a good ground.

Find an accessory wire to tap off of. This is a wire that becomes hot when the key is in the on position.

Tap a wire off of the found accessory and run it to the switching side of the relay (put a 10amp fuse in this wire), and then ground the other side
of the switch.

Wiring your fans like this will make them turn on when the key is in the on position (when the engine is running).

Please refer to the wiring diagram below.

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Old 02-01-2010, 06:52 PM   #2
ice.xiv
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Is there something wrong with using the stock setup's wiring?
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Old 02-01-2010, 06:54 PM   #3
hybrid gti 2
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Location: (818) 200k+ ej205 ppg 5mt
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02 vf30 pnp wagon
silver and cf

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Do they fit stock or other aftermarket radiator's?

How much more cfm then stock?
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Old 02-02-2010, 11:28 AM   #4
Mishimoto
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Quote:
Originally Posted by ice.xiv View Post
Is there something wrong with using the stock setup's wiring?
Nothing wrong with using the stock wiring. We do sell performance products for certain vehicles which come with stock belt driven fans. If they were to convert to our electrical fans, this is how they would do it. However, I have seen some Subaru's/Honda's/etc wiring up fans this way to keep them running at all times. I posted this up here to hopefully answer any questions that someone might have about how to do this.

Quote:
Originally Posted by hybrid gti 2 View Post
Do they fit stock or other aftermarket radiator's?

How much more cfm then stock?
Our universal electric slim fans will fit your stock radiator, or any aftermarket radiator you may have. You would want to check out our Mishimoto Electric Fan Mounting kit (http://www.mishimoto.com/mishimoto-s...t-tie-kit.html)

I'm not sure about the CFM which the stock set-up would pull. however, I do know that the:
10" fan = 850.1 CFM
12" fan = 933.5 CFM
14" fan = 954.1 CFM
16" fan = 1934 CFM

Let me know if you have any additional questions!
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Old 02-02-2010, 11:45 AM   #5
hybrid gti 2
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Let me clarify. Does the aluminum shroud allow the fans to mount to it or is it strictly the strap kit? Does the shroud fit all radiators like oem and oem design as far as mounting to the radiator?
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Old 02-03-2010, 10:42 AM   #6
Mishimoto
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Both the radiator and fan shroud are made to OEM specifications. You can buy a fan shroud and keep your stock radiator, or buy a radiator and keep you stock fan shroud.

Quote:
Originally Posted by hybrid gti 2
Does the shroud fit all radiators like oem and oem design as far as mounting to the radiator?
Yes.

Let me know if anyone has any additional questions! Thanks!
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Old 02-03-2010, 12:05 PM   #7
hybrid gti 2
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Few more questions. I see you mentioned there are several fan sizes. With the fan shroud what size fans are used with it? As well will I need to cut my current fan wire harness? Do you have a wire harness diagram that uses the factory harness instead of a on / off switch.
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Old 02-03-2010, 06:15 PM   #8
Mishimoto
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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!
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Old 02-04-2010, 01:09 PM   #9
arghx7
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triggering an aftermarket fan with the factory harness is the way to go
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Old 02-05-2010, 11:47 AM   #10
jsnm
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I thought the oem fans are 2-speed,are these?
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Old 02-06-2010, 11:42 AM   #11
arghx7
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None of the Subaru fans are two-speed like a Taurus fan. The two speed control is achieved by using a relay to change the circuit from series to parallel.





some models use single speed control, I am unsure what the year cutoff is

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Old 02-06-2010, 01:51 PM   #12
jsnm
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thank you for clarifying,good info.
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Old 04-16-2010, 04:53 PM   #13
roc sti 13
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Quote:
Originally Posted by Mishimoto View Post
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!
What about a stock 4 wire set up? I have yellow, green, blue & grey. I do not want my fans on all the time per the diagram you posted. I would like to use the factory harnesses I snipped off my stock fans to hard wire to the Mishimoto fans so they are plug & play with the factory wiring. Any help? Your site provides nothing on the subject & I can't find anything definitive elsewhere.
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Old 04-19-2010, 12:11 PM   #14
Mishimoto
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Quote:
Originally Posted by roc sti 13 View Post
What about a stock 4 wire set up? I have yellow, green, blue & grey. I do not want my fans on all the time per the diagram you posted. I would like to use the factory harnesses I snipped off my stock fans to hard wire to the Mishimoto fans so they are plug & play with the factory wiring. Any help? Your site provides nothing on the subject & I can't find anything definitive elsewhere.
You have four wires coming out the back of your fan? I would suggest to check which wires are the pos. and neg. (might be more than one) and have them spliced into the Mishimoto fan wiring.
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Old 04-19-2010, 10:03 PM   #15
silver-duck
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06

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Why don't you spec or build a plug and play connector for our subi. I have a set of your fans in the shop to put on.
Thankyou
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Old 04-20-2010, 10:53 AM   #16
Mishimoto
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You could just cut the connector off your fans and wire them into the Mishimoto fans in order to "clip" them into your harness.

We are working on something like what you have mentioned, too.
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Old 04-22-2010, 01:43 PM   #17
slava from goshen
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interested in proper wiring of the 4wire setup. they are in pairs. have that on 07sti
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Old 04-27-2010, 10:07 PM   #18
03wrxevo3big16g
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im in the same boat also. i bought ur radiator, fan shroud with 2-10 in. fans, upper and lower hoses and was getting ready to install them when i noticed i will not be able to have anything to hold up my overflow resiviour. is their anyone who makes aftermarket overflow tanks and a mout for this. this is the only thing i havent seen any info on.
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Old 04-28-2010, 09:10 AM   #19
jsnm
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CTS-V,& 05 RS

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prob just get an aftermarket reservoir,like needed with a fmic setup.
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Old 05-10-2010, 11:18 PM   #20
dexterous
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Any info on wiring up the 4 wire setup would be very helpful. I have a set of fans waiting to go in.
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Old 05-10-2010, 11:25 PM   #21
dexterous
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This is from a 04 STI but it looks like my 05 STI is identical:

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Old 05-11-2010, 12:02 AM   #22
dexterous
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To me it looks like both black wires go to the fan ground wire and both colored wires can go to the positive fan wire. If I am right the fans will run at full speed any time the ecu wants the fans to be on. Can anybody double check me here?
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Old 05-17-2010, 04:07 PM   #23
slava from goshen
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i'm still unsure, but I connected yellow and black to my fans, color matched to old RS Plug on 07 STI harness. It turns on when needed, sounds like full speed too.
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Old 02-12-2011, 07:36 PM   #24
FallHeadFirst
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Silver

Default Mishimoto fan success

I swapped out my radiator and fans today on my '05 WRX. The stock fans had 4 wires: A black/yellow pair and a green/blue pair. I clipped the connectors off close to the fans so I would have a bunch of room to screw up the wires. 'Now, which colors should I use to connect to the 2 wires on the Mishimoto fans?' I thought.

So, I tested the stock fan by running a current from my battery to the various pair combinations and found that the fan spins on 2 pairs. Black/Blue and Green/Yellow.

I connected the black to black and blue to blue on the fans and shrink wrapped them together. Finished it all up and crossed my fingers.
The fans kicked on just as they should.

Last edited by FallHeadFirst; 03-04-2011 at 02:26 PM.
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Old 02-28-2011, 01:18 PM   #25
veightkiller
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im about to get this fan for my forester too co'z one of my stock one is dying on me. im just trying to figure out how to rig a bracket to hold the overflow tank. what size of fan did you guys get for your subie? 12"
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