Rewiring Fan relay

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bosco32

Member - Posts: 4

Joined: August 22, 2016

Location: Australia

Posted: August 22, 2016 at 11:30 AM / IP Logged

Hi all,

I need some assistance please...

This is the factory wiring diagram:

From my research, the sub fan only operates when the A/C is on?

Now given I do not have A/C anymore on the car, and the front wiring harness (lights, horn, etc etc) is being remade, I want to rewire it so its just the main fan that comes on automatically... and the sub fan and sub fan relays are removed...

Any thoughts/ideas on how i can achieve this?

bosco32

Member - Posts: 4

Joined: August 22, 2016

Location: Australia

Posted: August 22, 2016 at 11:31 AM / IP Logged

the car in question is a 2012 Subaru WRX STi.

lurch228

Silver - Posts: 1,338

Joined: August 08, 2012

Posted: August 22, 2016 at 1:43 PM / IP Logged

Based on the diagram (Relay holder F27) and all associated wiring is for AC Turn on of both the main and sub fan. So it can be eliminated as thermostatic control of the main fan is controlled by the relay in the Main Fuse Box. Main fan relay 2 holds negative leg of sub fan at +12v until Main fan relay turns on then sub fan negative leg is ground. And Positive leg of sub fan is switched by ECM control of sub fan relay. If Main fan relay 1 doesn't energize then Main fan relay 2 doesn't energize and keeps Sub fan from turning on due to no ground.

bosco32

Member - Posts: 4

Joined: August 22, 2016

Location: Australia

Posted: August 22, 2016 at 6:50 PM / IP Logged

lurch228 wrote:

Hiya, thanks for following up, So essentially I can dump Main Fan Relay 2 and Sub Fan relay and just wire the fans directly to Main Fan Relay 1?

lurch228

Silver - Posts: 1,338

Joined: August 08, 2012

Posted: August 22, 2016 at 9:46 PM / IP Logged

You posted that you were removing the sub fan.

bosco32 wrote:

I want to rewire it so its just the main fan that comes on automatically... and the sub fan and sub fan relays are removed...

If this is the case then yes for the main fan only.

bosco32

Member - Posts: 4

Joined: August 22, 2016

Location: Australia

Posted: August 23, 2016 at 8:28 AM / IP Logged

would this be correct? :)

lurch228

Silver - Posts: 1,338

Joined: August 08, 2012

Posted: August 23, 2016 at 10:37 AM / IP Logged

Yes you have ignition power and ecm ground to energize the relay which connects fam motor to battery positive.

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