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Thread: Electric fan upgrade question

  1. #1
    Potential Tuner
    Join Date
    Jun 2016
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    Queens NY
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    1

    Electric fan upgrade question

    I upgraded my to electric fans with a Nelson harness. Fans work fine while the engine is running but won?t work when I turn on the a/c. I tried googling for a solution and found that a common problem that has been stated is that a/c pressure setting needs to be adjusted. But when I hook up my cable I can?t adjust the pressure setting on mine. It doesn?t give the option for it.
    Last edited by A4edwin; 06-11-2020 at 10:24 PM.

  2. #2
    Tuner
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    Aug 2016
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    Swansea Wales UK
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    Have you set the HP Tuners to advanced view from the edit drop down ? I'm sure it's in there
    Gen3 L59/4L60E LS3 cast manifolds, Small Cam change, 2800 Convertor, MPVI, using MTX-L for wideband tuning

  3. #3
    Advanced Tuner
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    Apr 2019
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    Parts store
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    Quote Originally Posted by A4edwin View Post
    I upgraded my to electric fans with a Nelson harness. Fans work fine while the engine is running but won?t work when I turn on the a/c. I tried googling for a solution and found that a common problem that has been stated is that a/c pressure setting needs to be adjusted. But when I hook up my cable I can?t adjust the pressure setting on mine. It doesn?t give the option for it.
    Look in the System>>Fans. The fan AC pressures are there and like jsf55 mentioned Edit>View> make sure to click Advanced mode.
    Also check the AC tab > Hardware and research what settings apply to your ride.

  4. #4
    Advanced Tuner
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    Jul 2009
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    Noble, OK
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    Post your fans and AC setting pages.

  5. #5
    Tuner in Training
    Join Date
    May 2018
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    10
    make sure you select 2 fans, and adjust fan#2 under ac recirculation

  6. #6
    Tuner in Training
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    Jul 2008
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    Prairieville, La
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    41
    What year truck? If its not a 03-04 then you wont have an ac pressure switch to turn the fans on.

  7. #7
    Tuner awest623's Avatar
    Join Date
    Oct 2019
    Location
    Pyeongtaek, South Korea
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    70
    Is it possible to run the fans using AC thru the computer without a pressure sensor. Or would it only be possible to just run a relay from the switch.