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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 General Help forums, part of the LSx Technical Help Section category; I've had them programmed for a while with a predator to run cooler and all the sudden they wont run ...

  1. #1
    Junior Member
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    BLACK
    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
    MOTOR CITY MARO' SSTODD's Avatar
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    PEWTER
    2000 CAMARO SS #3821

    There is no HI/LO, only on or off. One fan was set to turn on first and then if the temp. was not dropping the second would turn on at it's set point. I would verify your program settings and then maybe verify each fan.

  3. #3
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    On mine both fans operate simultaneously on either low or high speed at the on/off temps programmed.

    Responded to your other post in stereo/electronics because I saw that one first.

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    Catfish for Breakfast Bobby97SS's Avatar
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    97 SS

    The cooling fans work off of three relays configured to supply power to the fans in series for low speed (6 v. each) and in paralell for high (12 v.) This is how all the LTand LS powered f bodies and vettes that Ive seen work. I think the OBD1 LT motors were wired different. If you have 3 fan relays then thats how yours works too. Relay failure could cause the loss of one or both fans and one fan motor failing could cause the loss of both on low.
    Last edited by Bobby97SS; 01-11-2008 at 04:22 PM.

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