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Old 04-29-2009, 11:50 PM   #1
hybrid gti 2
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Question Manual fan switch or lower temp?

Has anyone done a manual fan switch or a lower temp fan switch?

How did you do it or where did you get it?
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Old 04-30-2009, 10:32 PM   #2
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I think that the thermostat does a good job of operating the fans, and if you're having heat problems despite that, something is wrong. However, if you're still inclined to do this, I'd assume a simple switched relay would do the job nicely. You'll just have to splice the wires from that to the wires driving the fan.
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Old 04-30-2009, 11:49 PM   #3
hybrid gti 2
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No problems just want more air flow.
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Old 05-04-2009, 03:57 PM   #4
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Mishimoto just came out with a low temp thermostat.. I haven't had a problem with any of their products, including a thermostat we put in my friend's GSX.
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Old 05-04-2009, 04:12 PM   #5
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Quote:
Originally Posted by hybrid gti 2 View Post
Has anyone done a manual fan switch or a lower temp fan switch?

How did you do it or where did you get it?
You should be able to wire one in yourself easily. Run a switched ground to the fan relays under the hood. I wouldn't recomend disconnecting the factory controls. You might just forget to turn them on once.

Another thing you can do is disconnect your A/C compressor (very easy) and then turn on the A/C. The fans should come on, but your A/C won't.

Last edited by eastcoastbumps; 05-04-2009 at 04:24 PM.
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Old 05-05-2009, 12:44 AM   #6
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I have critical low temp thermistat.

Yes I know the risk if I forget. Yet I will likely use it more often then not for the summer. The hook the factory back for the rest of the year. I already have a spare plug.

Just need to see about how to.

I wish I could figure out a way to override the oem setup and power the fan
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Old 05-06-2009, 12:28 AM   #7
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Quote:
Originally Posted by eastcoastbumps View Post
You should be able to wire one in yourself easily. Run a switched ground to the fan relays under the hood. I wouldn't recomend disconnecting the factory controls. You might just forget to turn them on once.
I've done this for years with GM cars I've owned with electric fans.

Run a second switched ground wire from the relay coil, leaving the OE wiring intact. Place a diode in-line so nothing can backfeed into the ECM. This way the ECM still has control over the the fans, but you can activate them whenever you want.

I have always wired them so I can turn on each fan individually, but you could wire it so both come on at the same time.
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Old 05-06-2009, 01:01 AM   #8
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Can you give me more detail info on this. Please!
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Old 05-06-2009, 01:54 AM   #9
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I was going to look at the Subie's wiring tomorrow, so I will get back to you then...

*edit*

Each fan has a relay (duh) and the whole relay module pops right out of the holder, so getting at the wires is no problem. I don't have time today to start wiring it, but I may tomorrow. I'll take pics when I do.

Last edited by DeathSStar; 05-06-2009 at 06:46 PM.
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Old 05-07-2009, 06:49 AM   #10
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Quote:
Originally Posted by eastcoastbumps View Post

Another thing you can do is disconnect your A/C compressor (very easy) and then turn on the A/C. The fans should come on, but your A/C won't.
Won't work, fans are activated by pressure not engagement.
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Old 05-07-2009, 07:31 AM   #11
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Quote:
Originally Posted by DeathSStar View Post
I was going to look at the Subie's wiring tomorrow, so I will get back to you then...

*edit*

Each fan has a relay (duh) and the whole relay module pops right out of the holder, so getting at the wires is no problem. I don't have time today to start wiring it, but I may tomorrow. I'll take pics when I do.
Nice!!! thanx
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Old 05-07-2009, 07:35 AM   #12
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Quote:
Originally Posted by indytruckboy View Post
Won't work, fans are activated by pressure not engagement.
Yea no sorry that wont work. This fan is activated 3 ways.

1) a/c switch. but the correct freon must be in the system.

2) higher temps

3) a/c switch with the car off, but key on.
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Old 05-15-2009, 12:32 AM   #13
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Quote:
Originally Posted by DeathSStar View Post
I was going to look at the Subie's wiring tomorrow, so I will get back to you then...

*edit*

Each fan has a relay (duh) and the whole relay module pops right out of the holder, so getting at the wires is no problem. I don't have time today to start wiring it, but I may tomorrow. I'll take pics when I do.
Still waiting on more info on your idea.
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Old 05-18-2009, 06:31 AM   #14
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You know...........


..........You can use Opensource tuning and just lower the temp the fan stages come on.
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Old 05-18-2009, 12:33 PM   #15
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By grounding the red/blue wire of the main fan relay it will turn on the fan.
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Old 05-18-2009, 10:10 PM   #16
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change the ECU temperature thresholds?
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Old 05-19-2009, 01:28 AM   #17
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interesting idea
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Old 05-19-2009, 09:33 PM   #18
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Quote:
Originally Posted by Geek Guy View Post
change the ECU temperature thresholds?
Yup.
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