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Old 03-01-2014, 06:55 PM   #1
ipkyss
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Join Date: Apr 2013
Location: Hampden,MA
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2004 Wrx 2.5 35R

Default Motor fan issue.

04 Wrx sti motor. The right (sub fan)engine fan is not working at any fan speed or temp. The left (main fan) works perfect.

What I do know. The 20amp sub fan fuse is good. If I jump the sub fan 2 relay the sub fan works perfect. All fan relays have power to the center terminal except the sub fan 1 relay.

What I am looking to find out is where to go next to find out why the sub fan 1 relay has no power?

As far as I know. The sub fan has not worked since I bought the already sti swapped car.
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Old 03-01-2014, 07:18 PM   #2
Andrewxxcarlson
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2006 WRX
WRB

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Get the wiring diagram, best way to see the flow.
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Old 03-01-2014, 08:46 PM   #3
ipkyss
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The first step to that is trying to figure out how much of the harness is 04 Wrx and how much is sti. I believe the main splice is in the driver fender. All I know is the harness was sent out to a company to be done.
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Old 03-01-2014, 08:52 PM   #4
kellygnsd
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LINK G4 hybrid STi

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I'm not sure about the '04 but for my '07 I have a separate fuse for each fan. You only mentioned checking one fuse. Is there another right next to it for the other fan?

NVM, re-read and saw you checked main and sub fan power. Time to break out the multi-meter

Last edited by kellygnsd; 03-01-2014 at 09:01 PM.
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Old 03-01-2014, 10:04 PM   #5
Andrewxxcarlson
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Quote:
Originally Posted by ipkyss View Post
The first step to that is trying to figure out how much of the harness is 04 Wrx and how much is sti. I believe the main splice is in the driver fender. All I know is the harness was sent out to a company to be done.
Contact the company???
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Old 03-01-2014, 11:03 PM   #6
ipkyss
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2004 Wrx 2.5 35R

Default

Quote:
Originally Posted by Andrewxxcarlson View Post
Contact the company???
Unfortunately I don't know what company it was and the previous owner recently passed a way...

I did check both fuses. Part of me just wants to run a fused power to the relay and leave it if it works. Just not sure if there are other related issues to go with it. Whats the reason for having two relays per fan? There not redundant as it will not work with only sub fan relay 2. That being said, I have not tested to see if sub fan 2 relay is actually getting a ground to activate, I just switched the contacts and it worked.
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Old 03-10-2014, 10:38 PM   #7
ipkyss
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Just wanted to bump this for any new thoughts. I have found a ton of wire diagrams, but nothing related to the fan relays or trigger wires. What I did figure out is there are two relays per fan because they are two speed fans. I guess that should have been obvious. I also found that if sub fan 2 relay is powered, it puts power to the sub fan 1 relay. I have a feeling it is just back feeding though.

It would be a huge help if I could just figure out when the fans should operate. Are they both suppose to turn on together? At what point do they switch to high speed? A/C has been deleted (not by me) on the car. I tried putting the relay and fuse back in. The a/c button and blower motor work, but that it. It will not turn on either fan.

The driveside fan will turn on and off by the computer. I am considering jumping the relay trigger wires from the main fan relays to the sub fan relays. Anyone see anything bad coming for that?
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Old 03-11-2014, 03:23 AM   #8
DHRDAN
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It's the wiring.


I have this exact swap, i did the wiring all myself. BOTH of my fans work.



It's been a looong time though, so i will just point you in the right direction because i'm too lazy to look. 1) The temperature sensor might be toast(if you have an open source obd II reader/scanner, romraider...etc you could pull the data on the fans with a laptop. that would tell you what is wrong)


2) Though if you're not throwing a code, and forgive me, because it's been a long time, i think it's the relay. From what you're described, the temp sensor is working, and the ECU isn't throwing a code, it must be the relay.


Think of it this way TEmp sensor >>>> ECU >>> Relay >>>> fan.


Best advice: pull the wiring diagrams, they will point to the problem, if its in the wiring/relay.
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Old 03-12-2014, 11:50 AM   #9
ipkyss
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2004 Wrx 2.5 35R

Default

Quote:
Originally Posted by DHRDAN View Post
It's the wiring.


I have this exact swap, i did the wiring all myself. BOTH of my fans work.



It's been a looong time though, so i will just point you in the right direction because i'm too lazy to look. 1) The temperature sensor might be toast(if you have an open source obd II reader/scanner, romraider...etc you could pull the data on the fans with a laptop. that would tell you what is wrong)


2) Though if you're not throwing a code, and forgive me, because it's been a long time, i think it's the relay. From what you're described, the temp sensor is working, and the ECU isn't throwing a code, it must be the relay.


Think of it this way TEmp sensor >>>> ECU >>> Relay >>>> fan.


Best advice: pull the wiring diagrams, they will point to the problem, if its in the wiring/relay.
Where did you go for wire diagrams? I have all the computer pin outs. I just can't find anything related to the fan wiring, fan relays, fan triggers,ect.

The power for sub fan 1 goes from the fuse into the main harness into the dash, then from the dash to the sub fan 1 center pin on the relay for power. It goes into the dash with power and comes out with none. I can can't find it after it goes into the car/under the dash to find out where it goes.

Going to put power to the center of the sub fan 1 relay tonight and see if the trigger wires are at least working properly.
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