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Old 04-13-2011, 01:13 PM   #1
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Default Elec. fan question?

Its on a 96 Lumina APV, 3.4L, I mentioned in my other thread about the fan "not" coming on, well it does (around 220*), so all seems fine, What i would like to do is "manually" be able to turn it on earlier (around 200*) if i want through a toggle, I've heard this can be done by grounding out the computers fan wire, That this is safer then just having it direct through a toggle from the Batt., then too the fan, Just need either a diagram of what needs to be done, or any help on this would be great. Thanks.
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Old 04-13-2011, 01:29 PM   #2
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What you want to do is ground the ecm signal at the relay, tripping the relay. Give me a minute and I'll tell you what pin it is.
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Old 04-13-2011, 04:10 PM   #3
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What you want to do is ground the ecm signal at the relay, tripping the relay. Give me a minute and I'll tell you what pin it is.


Cool.
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Old 04-13-2011, 05:34 PM   #4
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My diagram says pin5, but I can't say that'* what it'* labeled on the bottom of the relay.

I would pull the relay and measure for 12V on pin 85 or 86. Whichever one has 12V, run your ground switch to the other.
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Old 04-13-2011, 06:11 PM   #5
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My diagram says pin5, but I can't say that'* what it'* labeled on the bottom of the relay.

I would pull the relay and measure for 12V on pin 85 or 86. Whichever one has 12V, run your ground switch to the other.
Ok Thanks, now how will i run the wireing through a toggle? Excuse my ignorance, but when it comes to electrical, my brain goes numb, Just need to make sure i understand how to wire it completely, I'm guessing whichever pin 85 or 86 should be a "black" wire & that should be the ground right?
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Old 04-13-2011, 06:29 PM   #6
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Ok Thanks, now how will i run the wireing through a toggle? Excuse my ignorance, but when it comes to electrical, my brain goes numb, Just need to make sure i understand how to wire it completely, I'm guessing whichever pin 85 or 86 should be a "black" wire & that should be the ground right?
No, not necessarily. When you pull the relay, look on the bottom. The pins will be labeled. Use a voltmeter or a test light to find out if pin 85 or pin 86 has 12V. Do this by connecting the ground of the test light or voltmeter to the chassis and the positive to pin 85 and 86. Whichever pin has 12V, use the other to switch the relay. Do this by running a ground wire to the toggle switch, and the other wire to the pin on the relay.

Or if you see one labeled pin5, use that.

Maybe somebody who has alldata can look up for me how the relay is wired.
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Old 04-13-2011, 11:30 PM   #7
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Originally Posted by Jonpro03 View Post
No, not necessarily. When you pull the relay, look on the bottom. The pins will be labeled. Use a voltmeter or a test light to find out if pin 85 or pin 86 has 12V. Do this by connecting the ground of the test light or voltmeter to the chassis and the positive to pin 85 and 86. Whichever pin has 12V, use the other to switch the relay. Do this by running a ground wire to the toggle switch, and the other wire to the pin on the relay.

Or if you see one labeled pin5, use that.

Maybe somebody who has alldata can look up for me how the relay is wired.
Ok, i'll check it out, I've also heard you can do this by grounding out the Temp sensor switch, is this true?
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Old 04-13-2011, 11:33 PM   #8
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You got me there....
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Old 04-14-2011, 02:46 AM   #9
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You got me there....
I'll do it the way you told me then, I'll let you know how it turns out.
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Old 04-14-2011, 02:47 AM   #10
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You got me there....
I'll do it the way you told me then, I'll let you know how it turns out. Thanks for all your help
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