Electric fan conversion relay questions us 01' OS .

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Jul 23, 2007 | 12:37 AM

#31

HD6.0l

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From: In a shack

Quote:

Originally Posted by BlownHD

You wouldn't happen to know the harness part #???

Here is the number #15216042 , just checked gmpartsdirect.com it has went up since I bought mine .
If you happen to find a cheap source for these please post it up will you .

Jul 23, 2007 | 08:06 AM

#32

jknox

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From: Chapmansboro, TN

Quote:

Originally Posted by HD6.0l

I looked at some schematics and pin 42 and 33 are there in 02 so the PCM should trigger both just fine (2wd and 4wd) .
I think GMpartsdirect.com and I have a couple of more places that have it but can't remember them right off hand .
And yes the harness is part of a forward fog light assembly , so if you don't have fog lights and you want them you get two for the price of one .

My point wasn't about the fans pins - there are several 4wd connections to the pcm. If you switch to a 'vette os you'll most likely loose the ability to have 4wd. If I get bored today I'll look through the charts and see what actually goes where.

Jul 23, 2007 | 08:15 AM

#33

dc_justin

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Quote:

Originally Posted by jknox

I don't think that would be a problem, as both trucks and the vettes used OS 12212156 in 2002.

Jul 23, 2007 | 02:43 PM

#34

01WS6/tamu

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From: somewhere in TX

So could I upgrade to an 02 OS and maybe solve the problem of only having one fan relay output.

Jul 23, 2007 | 03:12 PM

#35

Tootall

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From: League City, Tx

you can make your own harness

http://img.photobucket.com/albums/v7...ring3relay.gif

Jul 23, 2007 | 04:13 PM

#36

HD6.0l

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From: In a shack

Quote:

Originally Posted by Tootall

you can make your own harness

http://img.photobucket.com/albums/v7...ring3relay.gif

Or this,

This works just like the factory harness , A/C on Low (2 fans) , temp reached 210* Low (2 fans) , High temp (over heated 240*+) High (2 fans) .

Last edited by HD6.0l; Jul 23, 2007 at 04:22 PM.

Jul 23, 2007 | 04:16 PM

#37

Tootall

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From: League City, Tx

Quote:

Originally Posted by HD6.0l

Or this,

what are the rules for that one, and how does it work?

Jul 23, 2007 | 09:23 PM

#38

blazinblue

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From: Denver, CO

im planning on getting ls1 fans with nelsons harness for 03 2wd, whats needs to be done for fans to work? is there any other parts that i need?

Oct 12, 2007 | 10:13 AM

#39

nyaiad

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fan conversion HELP

ok maybe I have overlooked it some where but here goes. I have a 2000 Z71 Tahoe...OLD BODY STYLE....5.7 engine. I got the 05 oem fans and puchased a Nelson harness.....they failed to tell me that their harness was only for the new body style....I can make it work but need to know if there is a pin I can use other than 42 because my blue PCM connector only has 32 pins. Silly me, I believed their plug n play talk. I know that it is only a ground but would like it to be temp operated.