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Thread: Making dual electric fans work without having to segment swap

  1. #1
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    Default Making dual electric fans work without having to segment swap

    Looking for some help to verify that I can make dual electric fans work on a vehicle other than the Camaro / Corvette (e.g. - not having to do a system segment swap). I have gone through the code in a 2001 disassembly and think that I found out why the regular EFILive parameters won't allow it. There is another parameter that pertains to the 2nd fan which is not currently in the EFILive. I created a CAX file for this additional parameter that seems to make it work. I have checked in on my bench 0411 using a 2002 OS, but would like to have someone else verify it on an actual vehicle. If you are willing to give it a try please let me know (FWIW - I am pretty sure I can find the correct parameter in any 512 kB OS).

  2. #2
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    Running dual fans with Nelson harness in 2000 Yukon XL (12212156 OS)
    G1203 set to "Series Parallel Fans"
    G0106 set to "Fan #2 Control"
    Fan settings from 2005 truck
    2007.5 CCSB LMM 4x4
    PPE Stg V, ML, 4094va, EFI Live DSP5, manifolds, up pipes, SS 4" exhaust, EGT, Boost, and DP gauges, 1R-0749, and 256-8753 CAT filters on Nicktane heads, lift pump on Kennedy harness, Yukon Grizzly

  3. #3
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    It sounds like you are using a 1 MB PCM in your swap. Yes, the 2005 truck settings do work, since that is the way they were setup from the factory. I am hoping to show that for the older 512 kB PCM's that you can make them work too. I am running an older version of EFI Live, and maybe somebody added in the parameters into the newest version to make it work too.

  4. #4
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    Ive never had a issue running dual fans from a 12212156 OS.
    What are you trying to do?
    These are the settings i have been using.

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  5. #5
    Joe (Moderator) joecar's Avatar
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    12212156 allows you to run dual fans F-car style using 3 relays.

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    Yes, for the F body and Corvettes / Holdens, it works using 3 replays. The issue that arises is that there are two parameters which I believe are missing from the list which on say truck OS's, are set to zero which prevents Fan #2 from turning on. I would like for someone to try it to see if they can now get Fan #2 to turn on. My research is showing that you would NOT have to do any segment swapping to get Fan #2 to work. I think that you would also NOT have to hook up the A/C pressure sensor to get it to work either.

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    Quote Originally Posted by turbo_bu View Post
    Yes, for the F body and Corvettes / Holdens, it works using 3 replays. The issue that arises is that there are two parameters which I believe are missing from the list which on say truck OS's, are set to zero which prevents Fan #2 from turning on. I would like for someone to try it to see if they can now get Fan #2 to turn on. My research is showing that you would NOT have to do any segment swapping to get Fan #2 to work. I think that you would also NOT have to hook up the A/C pressure sensor to get it to work either.
    My fan 2 output works just fine on a truck OS.
    Want me to send you my tune?

    Sent from my SAMSUNG-SM-G870A using Tapatalk

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