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pcm pin numer for fan control?

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Old 12-18-2003, 05:22 PM
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Default pcm pin numer for fan control?

anyone know it?
Old 12-18-2003, 06:00 PM
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#42 on the blue one. After just finishing the 5.3 conversion on my 94 work truck I can recite almost all the pins from memory!
Old 12-18-2003, 06:15 PM
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Does the truck PCM turn the fans on if the AC is on?
Old 12-18-2003, 06:18 PM
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Originally Posted by Flyer
Does the truck PCM turn the fans on if the AC is on?
Yes it does.
http://www.ls1truck.com/howto/pcmfan...ng_frames.html
Old 12-18-2003, 06:32 PM
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Mine doesn't. I had to run a separate relay for A/C operation with the clutch wire used to trigger it.
Old 12-18-2003, 07:19 PM
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i have been told it wont with the truck pcm either, it would be cool if someone would figure that part out.

thanks for the pin number.
Old 12-18-2003, 07:29 PM
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I'm currently running the flex-a-lite 282's with the VSC controller. The VSC has a relay for the A/C and a wire that taps into the A/C clutch wire. The thing I don't like is that the temperature control on the VSC seems to be stuck on low ~180. I have considered removing the sensor and using the #42 pin to turn the fans on instead.
Old 12-18-2003, 07:58 PM
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Default vsc

my vsc screwed me once, apparently the rheostat had a bad connection and shut my fans down completely while i was towing a trailer up a hill. sprayed some contact cleaner in it and turned it back and forth a few times. haven't had any problems since. thinking of converting mine also.
Old 12-18-2003, 08:00 PM
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What pin is it that you need in order to do this??
Old 12-18-2003, 08:23 PM
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From what I have heard the truck pcm has the option to switch on the fans. It just has to be enabled using LS1Edit. Hope that is the right info.


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