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cooling fans won't run on high

This is a discussion on cooling fans won't run on high within the Stereo and Electronics forums, part of the General Help category; I've had them programmed for a while with a predator to run cooler and all the sudden they wont run ...

  1. #1
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    2002, CAMARO Z28

    cooling fans won't run on high

    I've had them programmed for a while with a predator to run cooler and all the sudden they wont run on high, only low. What should I check?

  2. #2
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    It should be throwing a code if there was a fan/relay issue right? I've got mine set 194/185 for high speed and since it's cooler now they rarely run at high speed (I have LEDs and can see them come on). Since you have a Predator I'd look at real time data/ECT temp and make sure you're meeting the threshold for them to come on first.

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    On live data the ect's are 20 degree's higher than usual with the fans reprogrammed. The low fan setting do work though. I have unloaded and reloaded the predator tune a few times and nothing. I found online that the No. 2 relay controls the high speed setting. I'm gonna replace it.

  4. #4
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    Don't know if it makes a difference, but maybe the temp settings are overlaping? Here's what mine are set to just for info:

    Fan 1 (low) - on 184/off 175
    Fan 2 (high) - on 194/off 185

    Still think you'd throw a code if it was a relay.

  5. #5
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    More info on fan/relay operation here under diagnostics for P0481. www.gearchatter.com/viewtopic8997.php

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