Cooling fan cycling every 15 seconds

Discussion in '2007+ Mustang GT500 Tech' started by black2008gt, Jun 29, 2015.

  1. black2008gt

    black2008gt GT500 NOOB

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    Cooling fan on the 500 is constantly cycling on and off ever 10 to 15 seconds in 85 degree weather. Is this normal? Everytime it cycles it creats a 100 to 200 rpm dip and change in idle.
     
  2. Yagermeister

    Yagermeister Junior Member

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    Is it only when the ac is on?
     
    Last edited: Jun 30, 2015
  3. TxGt1

    TxGt1 forum member

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    Interesting my 2011 does the same when the AC is on. I just picked up a month ago and haven't had a chance to look into it.


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  4. black2008gt

    black2008gt GT500 NOOB

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    Only when ac is on.
     
  5. Yagermeister

    Yagermeister Junior Member

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    I had it even with the ac off at first then Lund made a few tweaks and now it is present only when the ac is on. Maybe a tuner can pipe in with if this is normal and fixable
     
  6. black2008gt

    black2008gt GT500 NOOB

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    Yea i'm getting it even with the stock gt500 tune.
     
  7. MikeVistaBlue06

    MikeVistaBlue06 Inventor: Asshole Points S197 Team Member

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    That's normal operation. Fan is cycling with the AC compressor.